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Baja, 150cc at a time: Part VI

As you’ll recall from our last installment of the CSC Mustang Baja saga, we left Ciudad Constitucion the next morning and we continued south. We wanted to make Cabo San Lucas that evening. That would be the turnaround point for our journey from southern California to the tip of the Baja peninsula, and we rode the entire distance on our little single-cylinder, 150cc, hardtail Mustang replicas.

Our intent was to bypass La Paz, as it is a large city and we didn’t want to get bogged down getting through it. The map showed a bypass road, and that’s what we intended to grab. But, our plans meant nothing. We missed the bypass road, and we found ourselves in downtown La Paz. Like I said, it’s a big town, and the temperature was over 100 degrees again. We were getting goofy from the heat. It’s almost hard to describe how oppressive the heat was. We were literally in the tropics, having descended past the Tropic of Cancer. High heat, high humidity, the hottest month of the year in Baja, fully suited in our riding gear…it was tough sledding. Simon had the best idea…he started shedding the heavy riding gear.

Simon, with red suspenders flying…all the gear, all the time!

John and Arlene, suited up and sweating.

Simon wrote an entry on his blog that said it all…

La Paz is a hot sweaty city on the Sea of Cortez. We are hot and sweaty (other than J. who travels in air-conditioned splendour). We miss the bypass and are lost. I ask a lady for directions. She begins describing the route. I understand individual words, even entire sentences. The whole becomes a jumble. My eyes betray a fatalistic acceptance of inadequacy.
The woman halts her instructions. Her smile is familiar. It is the generous female’s smile of understanding when faced by male incompetence. Men are men. They have their uses. However, rational thought is not the male’s strong point (expect even vaguely mature thought and you will be disappointed). Humour them. Lead them by the hand. Such is the Latin way…

In brief, she stops giving directions and says, “It will be best if you follow me…”

A very patient woman and her daughter in La Paz, who guided us out of downtown…

Once we were out of La Paz, we were on the open road again and it was much better. Even when it’s hot, you can still stay cool on a motorcycle if you are moving. When you stop, though, it gets warm and it does so immediately. So, we kept moving. We were approaching the Pacific Ocean on the other side of Baja, and the temperature dropped a couple of degrees.

After La Paz on the eastern side of Baja, it was about 70 miles directly across the peninsula to Todos Santos on the Pacific side. It was a nice ride.

We stopped in Todos Santos for lunch. I grabbed this shot of my bike and I want you to notice the BajaBound.com decal.

Taking a lunch break in Todos Santos. BajaBound!

BajaBound was one of our sponsors on the CSC 150 run, and they are one of our advertisers now. We were very grateful to Geoff and the good folks at BajaBound for their help on this adventure.

I wish I could remember the name of the place we had lunch in when we stopped in Todos Santos. It was great.

John and J enjoying lunch in Todos Santos.

After lunch, we were on the road again…headed to our next stop and our destination for the evening, Cabo San Lucas!

Simon taking a break just north of Cabo San Lucas. He was 77 years old when I took that photo. I really admire him.

Curva Peligrosa means “dangerous curve.” I don’t know how you say “watch out for the goats.”

Just north of Cabo. This guy pulled out right in front of us…anybody who would do this has to be a real ass…

We encountered a lot of construction during our trip, which gave the CSC Mustangs a real workout. I would guess that we probably did about 50 miles or so on dirt roads where the main highway was under repair.

We didn’t intend to do any dirt riding on this trip, but we sure rolled through a lot of dirt. One of the things that surprised me was how well the little Mustangs handled in the dirt, and in particular, in soft sand. Soft sand has always scared me on a motorcycle. At the time, I also owned a KLR 650 and a monstrous 955cc Triumph Tiger. With their narrow tires, these bikes would just sink into soft sand and do their best to toss me. The Mustangs didn’t do that. They had wide tires (almost balloon tires) and they were very light. They handled the soft stuff just fine. I’m not advocating using a CSC 150 as a dirt bike, but if you find yourself on a dirt road with soft sand, these bikes handled it with grace.

And finally, the California Scooter contingent arrived in Cabo after 1100 tortuous, hot, and beautiful miles through Baja! This was the perspective from our guest villa.

Cabo San Lucas! That’s the Sea of Cortez on the left, and the Pacific Ocean on the right.

Yep, some of the toughest riding in the world…and we did it! We ran the entire length of the Baja peninsula! I will tell you that I was absolutely beat when we finally made it to Cabo. The heat was bothering all of us, my leg was giving me a lot of grief from a prior injury, and we were all feeling the burn of a long ride. But we made it.

More good Baja trips on all different kinds of motorcycles…check out the ExhaustNotes Baja page!

If you would like to get up to speed on the prior installments of our CSC 150 Mustang replica ride to Cabo San Lucas, you can do so at this link: The CSC 150 Cabo Run

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Learn more about motorcycling through paradise in Moto Baja!

The Rimfire Series: A 200th Year Ruger .22

Purchased used in the early ’80s for $125, this super-clean 200th Year Ruger .22 semi-auto has sent a lot of lead downrange. A comparable Ruger today costs more than $400.

The story goes something like this: William Batterman Ruger (we all knew him as Bill) was a government engineer in the late 1940s who had a good idea for an inexpensive semi-automatic .22 handgun. Ruger’s design featured a grip frame constructed of two steel stampings (left and right sides) welded together, a tubular receiver, and a reciprocating bolt. Most folks think it looks like a Luger (the famed German semi-auto handgun of both world wars), and the name Ruger sounds a lot like Luger, but the new Ruger operation was nothing like the old P-08 Luger. Ruger’s new semi-auto was actually based on the World War II Japanese Nambu pistol. It’s where the idea of a simple back-and-forth bolt in a tubular receiver came from.

The profile is thought by most to be of the more widely-known German Luger, but the design is actually based on the Japanese Nambu.

Ruger left the government, hung out a shingle on a barn in Connecticut, and built 2500 of the things in 1949. They cost under $40 and they sold quickly. Ruger tweaked the design a bit and called the updated version the Mk I, and that version remained in production from 1950 to 1981 in both fixed-sight and adjustable-sight versions. The new Ruger was wildly popular, and for good reason: It was accurate, it was well built, it was nicely finished, and it was inexpensive. In 1976, every gun Ruger produced had a cool roll stamp: Made in the 200th Year of American Liberty. 1976 was the year I came back from an overseas US Army stint, and I started collecting Rugers with the 200th year stamp. One is the Ruger you see here.

Every Ruger manufactured in 1976 carried a 200th Year of American Liberty roll mark. They’re kind of cool, I think.

I picked up the Ruger you see here in the early 1980s, used, for $125 from a small gun shop in Pomona, California. The gun shop is no longer there, and it’s been so long I can’t even remember the name of the place now. You don’t see many small gun shops anywhere in the US anymore (the regulatory hurdles are just too burdensome for most small businesses) and these days, you don’t see too many gun shops of any size in California. Some think that’s a good thing. As you’ve no doubt guessed, I’m not one of those people.

This old Ruger is one of my all-time favorite guns, and I was out on the range with it yesterday. It’s fun to shoot. It was windy as hell out there (so much so, that ultimately the wind peeled the cardboard target board completely off the posts it was nailed to), but I managed to squirt through four boxes of ammo first (that’s 200 rounds). Even with winds gusting somewhere north of 50mph, this 40+ year old beauty (the handgun, not me)gave a good accounting of what a well-built American pistol can do.

Not too shabby for an old guy and an old gun on a windy day. That’s 50 rounds at 50 feet with up to 50 mph gusts. I think maybe I sneezed for that one lower left shot (the only one that didn’t break the 10-ring).

The Ruger 22 semi-auto is now in its fifth design iteration. There were the originals (the first 2500 referenced above). The Mark I followed. Then the Mark II in 1981. The Mark II had the bolt stay open after firing the last round (on mine, it closes on an empty chamber, so you have to keep track of how many shots you’ve fired). The Mark III arrived in 2004, and it featured a magazine release on the side of the grip frame, unlike the prior models’ latch release on the grip bottom (the Mark III’s mag release was more like a 1911’s). Ruger introduced the Mark IV a couple of years ago, and its claim to fame was a tilt-up receiver that made disassembly and reassembly a lot easier. Disassembly has always been easy on these guns; it’s the reassembly part that some folks find challenging.

The Ruger grip frame, formed from two welded steel stampings. The magazine latch is at the bottom of the grip frame.

I love my Ruger. That said, I really wanted a Mark IV when I found out a limited number were available with Turnbull’s color case hardening (which is a beautiful thing to behold). But alas, the Ruger Mark IV is not on the California list of approved handguns. Like I’ve said many times before, we have our share of nutty gun laws here in the Peoples’ Republik, eclipsed only by our healthy dose of nutty politicians.

A Turnbull color case hardened Ruger Mk IV. This is a beautiful handgun. It’s not available in California, unfortunately, or I would own one.

There are some collectors who focus exclusively on Ruger’s extensive array of .22 auto handguns. Lord knows there’s been a bunch of them, from the original through the Mark IV, in blued steel and stainless steel, some with plastic frames, different barrel lengths, bull barrels and tapered barrels, fixed sights, adjustable sights, one with a 1911-style grip frame, and many more. My fixed-sight 200th Year Ruger, the one you see in this blog, is one of the simpler ones and it has served me well. I’ve put a ton of .22 ammo through it in the last 40 years, and I aim to send another ton downrange over the next 40 years.

Good old .22 ammo. Check out the price on this box!

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My Other Ride: The Bomber

I saw the advertisement for The Bomber in our local Holloman Bookoo website. Holloman Bookoo is like Craigslist but more local. There may be other BooKoo sites but I haven’t searched for them because the stuff for sale is too far away. This story gets a bit complicated but I was searching for a drive train to scavenge for Brumby, my Jeep YJ.

The Bomber, a half-ton 1990 4X4 GMC Suburban, had 3:73 axles, a running throttle-body fuel-injected small-block engine and was the last year of the solid front axle Suburbans. 1989 and 1990 were odd years for Suburbans because the rest of GM’s truck line changed body styles in 1988. For some reason the Suburban didn’t make the cut and soldiered on with the classic Square Body until joining the rest of the gang in 1991. Except for logos, the Chevy and GMC versions are pretty much exactly alike.

The Bomber’s half-ton, six-lug front axle is GM’s take on a Dana 44. I watched a Dirt Every Day video that said 1989/1990 models received axle shaft upgrades and were maybe a bit better than the D44. All this was good news for Brumby because the transmission had lost a gear and the little YJ desperately needed more power.

The Bomber’s owner wanted $1800. I drove the big beast around and offered him $1500. It was too easy; did I leave money on the table? CT (my wife) was a little unsure about my plan to strip out the Bomber for a pie-in-the-sky plan to boost the Jeep’s power. The worst time to plan an engine-axle swap is when you have no place to work and are trying to find a house to live in so I put the ménage on the back burner and busied myself with the mundane tasks of life.

The old GMC ran well and I started using it to haul materials. The thing had crazy stiff springs on the rear axle: I could load 2 tons without the axle bottoming out. The 350 small-block, while no powerhouse, could pull the grade to my house without exploding into bits. The door sticker says “Built Flint Tough” and they mean it. The added advantage of a low-range transfer case and four-wheel drive meant I could haul a 10,00 pound, concrete mixer with a yard and a half of mud up Tinfiny’s steep, slippery driveway.

The Bomber came with a custom paint job that could not have been more out of place. It was shocking. CT recommended I cover over the Starsky & Hutch themed wagon if I ever wanted her to ride in the thing. It took less than a quart of BBQ black to roll over the offending stripes. Not that it looks good now, but at least people run away slower.

Shod with smallish but almost new 31” tires, the bomber looked a little cheesy in the tire division. Bigger, 33” tires that would fill the wheel wells were ordered from Wal-Mart. Just like that the Bomber’s value doubled. I put the 31” tires on Brumby the Jeep. Remember the Jeep? The reason I bought the Bomber?

The thing is, a Suburban is handy as hell to have around. I can load it up with bags of concrete or building materials and everything stays dry. We went camping in the beast; there’s over 8 feet of room for bedding if you fold the seats down. The body is dented but rust free. I use the ‘Burb for garbage dump runs and to scare people.

I’ve grown attached to the Bomber. You’ll hear no more talk of swapping drive trains. In fact a whole new list of projects has been created. I need to remove all the interior plastic and rugs from the passenger doors rearward because it’s too hard to keep clean. I want the cargo area bare metal so I can hose it out. The stupid wooden overhead console has to go because I keep hitting my head on the edge. Then the automatic transmission needs to be swapped out for a 4-speed manual. I can’t stand automatics. It’ll need a decent paint job at some point and a roof rack with one of those tents on top.

Worst of all I’m still on the lookout for a V-8 drive train to swap into the Jeep.

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Zed’s Not Dead: Part 7

I finally got Zeds’ carburetors reassembled onto the rack. I’ve synchronized the 4 carbs as close as I can. The Z1 repair book I have gives a down wind, throttle-slide gap to strive for and after I got that adjustment close I moved over to the upwind side and used a small drill bit as a standard to fine tune the gap. For me, it’s easier to work that side. I use a drag/feel type of measurement. You slide the bit back and forth to sense the tension between the slide and the lower carb venturi and then try to get them all the same. You’ve got it close when the next bit under is loose and the next bit over won’t go.

After trimming some rubber flashing where the brass manifold vacuum ports enter the new rubber manifolds I managed to get them installed without stripping any more 6mm screws. The manifold clamps are soaking in Evapo-rust as we type.

The Z1 uses a fancy-for-the-time crankcase vent system. Mounted on the rear of the top crankcase is a plenum to catch oil mist and condense it back into the engine. I took this apart because the hose leading from the vent to the air cleaner box was missing and I wanted to be sure some sort of oil loving spider did not take up residence inside. Luckily it was clean inside so I gave the can a quick polish and reassembled the thing.

Next I checked the valve adjustment because I’ll be starting the beast soon and I don’t want to fight the system if the valves are way out of adjustment. Before removing the valve cover I marked the front in case it matters.

The cams and valve shims look unworn. This bike shows 41,000 miles on the odometer! If this were a Honda the cam lobes would be galled. I know this because almost every Honda I’ve owned galled its cam lobes.

The valves are close enough to start the engine, two are on the tight side and two are on the loose side. Four valves are within spec. I’ll recheck everything after starting the engine in case a chunk of carbon or a mouse paw is affecting these readings.

Zed’s clutch cable is in bad shape so I removed the clutch actuator housing/sprocket cover for replacement and cleaning/lube/adjustment. Inside I found the neutral light indicator switch broken off. I don’t think a ton of oil would have spewed out as the hole is not pressurized but it most likely would have leaked.

Zed appears to be going backwards but trust me she’s making progress. With the front of the bike jacked up you couldn’t miss the loose steering head bearings. Rather than just tighten them I took the forks apart to re-grease them. Much like removing the sprocket cover it’s a good thing I did. The top bearing looks fine but the bottom is pretty rusty. I’ve cleaned this mess up and in a pinch the bottom bearing, while pitted, could be used again but I’ll order new bearings. I’m in no mood to take the front apart again.

Zed’s fork seals were leaking. Another stroke of luck as the oil kept the lower section of the fork tubes from rusting. Under the headlamp ears the rust is worse. I’ll clean it off and coat that section with grease when I reassemble the forks. You’ll never see it. I’ve started cleaning the fork legs in preparation for disassembly. You probably already know this but remember to loosen the big bolt on top of the fork tube before removing the tubes and loosen the allen-head bolt on the bottom of the fork sliders (under the axle boss) before removing that big top bolt.

My buddy Skip sent what we hope is the correct spark advancer unit so Zed should have everything it needs to start soon. I’m a little concerned that I can only find first gear and neutral in the transmission. Hopefully, once the engine starts and oil is slung around the gearbox will shift.

Want to follow the entire Z1 resurrection? Just click here!

RX3 to RX4 Comparisons: Part 2

This is a continuation of the preceding blog comparing the new CSC RX4 to the RX3 motorcycle. I probably should have waited until I had taken all of the photos and organized the comparison into discrete areas (like wheels, tires, brakes, and so on), but you’re going to have to deal with the ramblings of a disorganized mind (and that would be mine). With apologies in advance, my ramblings will ramble on in no particular order.

With that as a preface, let’s take a look at the fuel tanks. First up is the RX4 tank, and the big news is that it holds 5.3 gallons instead of the RX3’s 4.2 gallons. Here’s the RX4 tank…

The RX4 fuel tank. The colors are stunning. It holds 5.3 gallons.

You can’t help but notice the paint on this motorcycle. CSC received three bikes for the U.S. certification effort…one in silver, one in red, and one in orange. My bike has the metalflake orange color and it’s visually arresting (it will stop you in your tracks when you see it). Here’s a close up…

Metalflake orange. It’s beautiful. It’s the new fastest color.

There are really three or four colors going on here. One is the metalflake orange. Another is the metallic silver on the tank’s side panels. A third is the even darker metallic gray on yet another side panel (you’ll see that in another photo below). And the fourth is the black of the frame and the molded plastic body bits. It all comes together nicely.

You can compare that to the orange on my 2015 RX3…

My orange RX3. This is the 2015 model, which is little bit different than the later CSC orange on newer RX3 motorcycles.

I mentioned the RX4’s 5.3 gallon capacity. Okay, let me explain a bit more. I haven’t attempted to actually run the thing dry and put 5.3 gallons of gasolina in the tank. 5.3 gallons is the figure Zongshen provided. The RX3’s spec is 4.2 gallons, but that’s not the right number. The RX3’s tank would hold 4.2 gallons if there was nothing else in it, but the tank is also occupied by the float for the sending unit and the fuel pump, and they both take up space. Gerry and I once took a bone dry RX3 tank with the fuel pump and sending unit in it to a gas station, and after really finessing the gas station pump, we were able to coax 3.9 gallons into the RX3 tank. I don’t know if the same situation applies to the RX4 tank. Maybe that 5.3 gallon statistic is really 5.o gallons.

The other thing going on in the RX3 is that the fuel gage and the fuel warning light indicate you are out of fuel when there’s still something close to a gallon left in the tank. As it was explained to me by the guys in Chongqing, that’s to make sure the fuel pump is always surrounded by fuel (it’s how the fuel pump is cooled). I don’t know if the same situation applies to the RX4 fuel tank. I have to get more miles on the bike to let you know.

So, let me do what I have a bad habit of doing, and that’s go tangential for a bit to tell you a little bit more about the RX3 tank, and in particular, the tank on my RX3. You’ll notice that my tank has a panel with a decal that says “Speed” on it. That was the first year of the RX3, and I guess it was Zongshen’s idea of making the motorcycle convey a fast image. The Internet weenies had a lot of fun with that. When they cornered me on it, I told them that CSC originally asked that the bike’s name be “Methamphetamine,” but we would have had to make the font so small you couldn’t read it. That got a laugh and the Speed teasing ended. Mercifully, CSC changed the name to “Adventure” the following year. There’s no such name label or decal on the RX4. I think that’s a good thing.

You probably notice all of the other decals on my RX3’s fuel tank. I like to think of them as campaign ribbons. We put one on their for each of the Baja runs, the 5000-mile Western America Adventure Run, and the Destinations Deal tour. I like them.

Moving right along, here’s a side view of the RX4 showing the engine and fuel tank, and then a similar photo of the RX3…

Right side engine and fuel tank view of the RX4. Note the four colors, the engine guards, the engine cylinder head casting, the crank position windows (on the cylinder head), and the oil accoutrements.

The RX3 fuel tank and engine viewed from the right side of the motorcycle.

There’s a lot to take in on those two right side views. Here we go, folks.

I guess the first thing to notice are the engine guards. In the old days, we used to call them crash guards, but these days it’s more correct to say engine guards. Whatever. Anyway, on the RX3, the engine guards extend all the way to the bottom of the engine. On the RX4, they only cover the upper portion of the bike. I don’t know why that is. It might be that if you drop the RX4 on its side, the upper portion is enough. But I don’t know this, and I’m not going to drop both bikes on their sides to find out.

On the RX4, the crank position windows are on the right side of the engine. You can see them just behind the spark plug on the cylinder on the right side. On the RX3, those viewing ports are on the left side of the engine.

The crank position viewing windows. On the RX3, they are on the left side of the engine. One the RX4, they are on the right side of the engine.

The RX3 has an upswept exhaust pipe; on the RX4, the exhaust pipe heads south to run underneath the engine, and then heads north again to an upswept exhaust pipe (you can’t see that in the above photo). While some might view the RX4 exhaust routing as less than desirable from an offroad perspective, I’m okay with it. The RX4 has a steel engine skid plate, and the RX4’s exhaust routing makes getting to the oil fill port a lot easier (it’s just aft of the water pump).

You’ll notice that the cylinder, cylinder head, and upper engine mount castings are all much heftier than are those on the RX3. If you look at the cylinder head casting just aft of the cylinder head, you’ll see a weird-looking ribbed triangular extension with a threaded hole in it. It’s on both sides of the engine.

A fixturing attach point, or perhaps to mount the engine in another bike?

With that threaded hole, it looks like Zongshen left a part off the bike (there’s nothing there). My guess is that this feature is either used to support the engine when it is moving down the assembly line, or that it is there for mounting the engine in another frame (perhaps one of the Dakar rally bikes). I’d like to see Zongshen remove that part of the casting on the RX4 engine; it serves no purpose on the RX4 other than to add weight to a bike that doesn’t need to take on ballast.

The RX4 appears to have the same arrangement for the oil filter and the oil strainers as does the RX3. One strainer is accessible via a threaded cover on both sides of the crankcase; the oil filter is located beneath a cover on the right side of the engine.

Clockwise from 10:00: Small oil filler access hole and large oil filler access hole (just like the RX3), oil strainer cap (just like the RX3; there’s another on the other side of the engine), oil filter cover (just like the RX3), and oil view port (just like the RX3).

That’s enough for today, my friends. We’ll have another RX3 and RX4 micro-comparison posted tomorrow. I’m going to take a break and get out and ride the RX4 for awhile…

RX3 to RX4 Comparisons: Part 1

Wow, where to begin? I thought I would do this in a single blog, but I quickly realized it’s going to take more than a few.

Joe Gresh thought it would be a good idea to do a comparison between the RX3 and the RX4, and since he’s the brains in this outfit (I’m the good looks), I started the photos for the comparo earlier today. There’s a lot to discuss, and I don’t want to try to cram it all into a “Gone With The Wind” single blog.

So, here we go with the first set of comparisons, and I guess as good a place to get started as any is with a shot from the rear of both bikes…

My RX3 on the left, and the new RX4 on the right. The RX4 has a 19-inch front wheel (the RX3 has an 18-inch front wheel). As a result, the RX4 leans a little bit more to the left than does the RX3 when on the sidestand.

You’ll notice that my RX3 has the stock plastic luggage and the RX4 has the optional Tourfella aluminum luggage. The RX4 will come stock with the same plastic panniers as the RX3, but it will have a taller tailbox than the current RX3 design. The current RX3 tailbox won’t close with a full face helmet, but the taller stock plastic tailbox to be provided on the RX4 will. I’m hoping the 2019 RX3 will have the taller tailbox, too.

The Tourfella luggage is a great option. Both sets of luggage are lockable; the stock plastic bags use the bike’s ignition key. The Tourfella luggage has a separate key. The Tourfella bags have considerably more capacity than the stock plastic bags, and when I rode in Colombia with good buddies Juan and Carlos, my AKT RS3 (a carbureted RX3) had the Tourfella bags. You get a huge increase in capacity (which is nice), but the aluminum bags are wider and I’m guessing they are heavier. You’ll see a slight decrease in fuel economy and top speed with the larger bags on an RX3; I don’t know what they’ll do to both stats on an RX4.

I like the looks of both sets of luggage. I’m a guy who travels light, so the stock bags have been good enough for me on my adventure tours. One other minor disadvantage of the Tourfellas is they are wide. I scraped a taxi splitting lanes when debarking from a ferry ride down the Magdalena River in Colombia. Joe Gresh’s RX3 had the Tourfellas in China, and I watched him have the same problem a couple of times when splitting traffic there. But those big aluminum Tourfellas sure are nice. They are a high quality bit of kit, too. And like I said, you can carry a lot of stuff in those aluminum boxes.

Here are photos shot from the rear of each bike, starting with the new RX4…

The Tourfella luggage on the RX4. It’s 34-inches across those two aluminum panniers. That’s wider than the bike’s handlebars.

And here’s my RX3. It’s one of the very first delivered to the United States, and I’ve done some serious traveling with this motorcycle. It has the stock plastic luggage.

A dirty bike that’s seen a lot of miles…my kind of machine. The width across the stock RX3 panniers is 29 inches (they are 5 inches narrower than the Tourfellas in the above photo, and they are 2 inches narrower than the RX3’s handlebars). I don’t know what the width of the stock luggage will be on the RX4.

Next up are two photos of the exhaust outlets. On the RX4, the muffler has two openings, suggesting the bike is a twin (it’s not; it’s a single like the RX3).

The RX4 muffler. It’s stainless steel, and it contains the bike’s catalytic converter. Two openings aside, the bike is a single. The exhaust note is sweet. I’ll do a video in a future blog.

The RX3 muffler, with its single outlet. It’s also a stainless steel muffler, and it has an awesome exhaust note.

As I mentioned in my earlier blog on the RX4, the new bike sounds like the RX3, but you can tell it has a bigger and stronger engine. Both bikes sound almost as if they have a custom pipe. They are both actually a little bit louder than I’d like, but the sound is great. Good ExhaustNotes, I’d say.

Moving to the other end of both motorcycles, let’s take a look at the front brakes. The RX4 has twin-piston calipers and dual disks…

Dual discs on the RX4. The braking is a bit stronger than an RX3 with the CSC larger single disk.

The RX3 has a single disk with a twin-piston caliper up front. My bike has the CSC larger diameter brake rotor. I think this is a worthwhile addition to the RX3, but I also think the stock RX3 brake is sufficient.

The larger diameter front disk rotor on my RX3. It works well.

If you look closely at both of the above photos, you’ll see the two front wheels are different. I’ve already mentioned the RX4’s 19-inch front wheel (the RX3 has a standard 18-inch diameter front wheel, with a 19-inch wheel available as an accessory from CSC). What is also shown (but maybe is not so obvious) is that the RX4 has aluminum rims, while the RX3 has steel rims. I think that might be what makes the RX4 handle so well. Aluminum wheels mean less unsprung weight, and they also make a motorcycle handle more crisply.

The production RX4 motorcycles will have anti-skid braking, and unlike the the 2018 RX3 ABS, you’ll be able to turn the ABS off on the RX4. That’s something you dirt denizens asked for, and your voices have been heard. The RX4 will come standard with wire wheels (like you see in these photos), and cast aluminum wheels with tubeless tires will be an option. The RX4 wire wheels require tubes.

Here are couple of tangential thoughts intended for the wizards at Zongshen (they read ExhaustNotes, too, you know). I’d like you guys to consider adding the dual discs, the aluminum-rimmed wire wheels, and the switchable anti-skid braking on the 2019 RX3. That would make an already great motorcycle even better, I think.

Both the RX3 and the RX4 have Cheng Shin (CST) tires. They’re bigger on the RX4 (more on that in the next blog). These are good tires. They hook up well and they last a long time. I get about 6,000 miles out of a rear tire on my RX3, and as is the case with most motorcycles, the front tires last about twice as long as the rear tires.

Staying at the front of the motorcycle, let’s now take a look at the face of both bikes. This is my RX3…

CSC changed the windshield and headlight design on the RX4. During my trips to Chongqing, I saw that Zongshen evaluated using the same RX3 windshield and headlight on the RX4. I thought keeping the windshield would have been a good idea, but hey, what do I know? The RX3 windshield has been universally praised by everyone who has ridden an RX3, including every magazine that tested the bike. It is a good design. It just works…there’s no turbulence, and it’s well below your line of sight. But like I said, who am I? I don’t make a million motorcycles a year. Zongshen does.

The RX3 headlight…well, that’s not the RX3’s strong point. Being charitable, I’d say it’s anemic. I don’t ride at night if I can avoid it, but I recognize that the stock headlight doesn’t light up the world the way I’d like it to. The spotlights you see on my bike are from AKT Motos in Colombia. I had them on the RS3 I rode there, and I liked them so much that my good buddy Enrique Vargas gave a pair to me when I left his beautiful country. CSC sells accessory spotlights, too, but I kept the AKT Motos lamps on my bike. I use the spotlights as headlights on my RX3 when I ride at night. Many folks who buy an RX3 put a brighter bulb in the headlight, and that works well. I have one that my good buddy TK gave to me, but I haven’t put it on my bike yet.

You’ll also notice the very cool headlight guard on my bike. That was another gift from Enrique in Colombia. CSC now sells a similar headlight guard. Mine is Colombian, and I’ve kept it instead of the CSC headlight guard because it was a gift and I like it.

Onward and upward…here’s the front end of the new RX4…

A clean, modern look: The RX4 front end.

The RX4 headlight and windshield design are much changed from the RX3. Like I said above, CSC could have gone with a front end look identical to the RX4, but they opted instead for the new look. It’s grown on me. I would be okay with either one, and at first I recommended staying with the RX3 look because I feel it is an iconic Zongshen motorcycle face, but I like the new look, too. The new RX4 windshield is adjustable (the RX3 one is not). The headlight is a completely different design, and later tonight, I’m going to move both bikes onto the street to see how the headlight illumination patterns compare. I’ll try to get some photos so you can see the difference.

I’ll write more comparing the two bikes in the next several blogs. This blog is already longer than I intended, and there’s a lot more to cover in these comparisons.

You know it’s coming, folks. Like I always say: Stay tuned.

Zed’s Not Dead: Part 6

I’ve been spending some time with Zed’s carburetors, working on details that required home-brewed engineering. The Mikuni carbs on Zed don’t have a traditional choke (a flap that blocks air going into the carb causing a rich mixture) but we still call it a choke. Instead, Zed’s carbs employ an enrichener circuit, which is more like a tiny, completely separate carburetor grafted onto the main body of the carb. Sort of like the brain inside Krang’s stomach on the Teenage Mutant Ninja Turtles cartoon. The enrichener has its own air intake on the upwind side of the throttle slide. This fuel circuit is fixed; no adjustment needed and is controlled by a plunger on the downwind side of the throttle slide. Lifting the plunger allows air to flow through the tiny carburetor at a pre-set fuel/air mixture and if everything else is right, helps a cold Kawasaki engine start better.

One of Zed’s four carbs was missing the little plastic bobbin that slides over the enrichener plunger shaft and is held onto the shaft by a tiny Jesus Clip. Two small fingers connected to the choke rail act on this bobbin and without it the plunger won’t lift. I Googled for a bit but could not find the bobbin part so I attempted to make one. I drilled a plunger-rod sized hole through a small piece of nylon and chucked the nylon into a Ryobi drill. Using a flat file I machined the nylon as the drill motor spun: a New Mexican hand-lathe. It worked great until the center of the bobbin got too thin and the whole mess spun out of control leaving me with a distorted pile of junk.

Back to square one. I noticed how the bobbin was nearly the same size as the pop rivets I’d been using to assemble parts of Tinfiny’s generator room. I have about 500 of these rivets in stock so I could afford to lose a few. Knocking the pin out of the pop rivet revealed a bore just a wee bit small for the plunger shaft but it was not a problem to run a drill bit through making the bore an exact fit for the plunger. A pop rivet only has one flanged side so I repeated the process on a second rivet, cut the two rivets to equal the length of a factory bobbin and assembled the mess. I cannot wait for a hard-core Z1 enthusiast to happen upon the aluminum bobbin. It’ll probably cause a heart attack as most Z1 fans are around 75 years old.

Between the throttle linkage pivots on each set of two carbs there are little dust covers made from a treated black paper. Or maybe the dust covers are rubber, I can’t tell. Three of the four covers were broken on Zed. The covers go over the springs and ball joints on the linkage. They don’t seal all that well but might keep a larger bug from crawling in there.

This is a part I didn’t bother looking for because I can make new ones in less time than it takes to look them up and order them. I used the thin plastic lid from a box of self-tapping sheet metal screws. Without a lid you know the screws are going to end up scattered across the shed floor. The dust covers didn’t come out as nice as I would have liked. Luckily, once installed you can’t see the things.

On the Z1 900cc, each set of two carbs share a fuel inlet pipe. The pipe goes between the carbs and is a metal Tee fitting with thick rubber o-rings cast onto the straight section of the Tee. This rubber hardens and shrinks resulting in a loose, leaky fit. You can buy new ones for 34 dollars but if you’ve read Zed’s Not Dead this far you know what is going to happen next.

I cut the rubber away from the fuel pipe and polished the exposed metal to ensure a smooth sealing surface. Then I drilled a small hole near the end of the pipe in order to install a pin (made from the drill bit). The pin is the same length as the width of the fuel inlet bore so once it is installed in the carb body the pin can’t fall out.

Now I used a ¼-inch length of rubber fuel hose (be sure to use the non-reinforced hose as cloth reinforcing strands will wick fuel, causing a leak) and slid this hose onto the fuel Tee. Next came washers and finally the pin. The assembly fits snugly into the carburetors. It helps to put the fuel feed hose on before you slide the carbs together. Hopefully it won’t leak.

I’ve got the carbs assembled onto the rack and everything seems to work smoothly. I’ll be testing the float levels on the bench and will sync the throttle slides as close as I can get them. The idea being all four slides move the same distance in unison. Even if they’re not perfect the bike should run reasonably well. Later, manifold vacuum gauges can be used to adjust the carbs for any slight differences between cylinders.

Want to follow the entire Z1 resurrection? Just click here!

A Ducati story, and more…

I get four motorcycle magazines: Motorcycle Classics, RoadRUNNER, American Iron, and Motorcyclist. Every once in a while, a story comes along that goes way beyond simply being good. The current issue of Motorcycle Classics has such a story: Tempting Fate: Around the World on Ducati 175 Tourismos. Landon Hall is the Motorcycle Classics Managing Editor, and he (along with Richard Backus, the head honcho) have a winning formula: A great team of writers and photographers, an eye for a great story, a focus on vintage bikes, and the ability to pull it all together in every issue. I once told Landon that each time I get the latest copy of Motorcycle Classics, I get concerned because it is so good I don’t know how they’ll be able to do better in the next issue. And then they do. Every time.

World travelers from the 1950s…two well-worn Ducati 175s.

The story, Tempting Fate: Around the World on Ducati 175 Tourismos , is about two young Italians (Leopoldo Tartarini and Giorgio Monetti) who went around the world on Ducati 175cc motorcycles in the early 1950s. The tale appealed to me immediately because it involved a long journey on small displacement motorcycles, and the writing and the photography sealed the deal (Hamish Cooper penned the story and Phil Aynsley did the photography). The details made it come alive, like this one: Ducati actually issued these guys handguns as part of their kit (Steve Seidner, are you getting my drift here?). And more. Lots more. Trust me on this: You’ll enjoy this article.

More good info…the index page for our ExhaustNotes gun stories is up, and you can get to it here:

The 70% Rule

One of my moto buddies stopped by Tinfiny Ranch, our high desert lair in New Mexico, and in the course of showing him around the property we got to talking about how incomplete everything was. He called it the 70% rule. As in 70% is close enough and time to move on to another project.

I blame it on my upbringing because I was raised in a house that was under construction for 16 of the 19 years I lived at home. There were additions, a second floor added, Walls knocked out and relocated, wall unit air conditioners installed and all manner of improvements that never saw completion. Oh, the stuff was sort of finished. The air conditioners worked fine but were never trimmed out, leaving a jagged edge around the face. The second floor had a beautiful staircase and the roof didn’t leak but it was still bare walls and floors when I left home for good. Same for the upstairs bathroom: the plumbing was stubbed out but the fixtures never were installed. The cats loved it up there. They had the whole floor to themselves.

Finishing just doesn’t seem that important to me. I’ve got the off-grid solar panel system working in Tinfiny’s large metal shed. Except it needs more batteries to complete the storage system. I have the 3000-watt array connected to four group 31 batteries, which the solar can charge in about an hour of sunshine. The rest of the day the solar power is wasted. I need about 12 more batteries to give the solar panels something to keep them busy. And I’ve yet to run the 12-volt circuits or the 24-volt circuits but I do have some LED lights and 120-volt outlets.

I’d like to have a concrete floor in Tinfiny’s shed. I’ve been working on it. Sadly, only around 25% of the floor is concrete leaving 75% (AKA the lion’s share) dirt. It’s a solid sort of dirt though, and not much water runs under the building’s edge when it rains, unless it rains really hard. Then it gets a bit muddy. It would have been a heck of a lot easier to pour the slab first, then put the building up but that ship has sailed.

I’ve nearly finished the water system. There’s a 2500-gallon tank being fed rainwater from half of the shed roof. I plan to gutter the other half some day but first I have to finish those 24-volt circuits to get the pressure pump working. I know the pump works ok because I’ve rigged it up to an 18-volt Ryobi battery. It’s just temporary, you know? There’s a pesky leak on one of the Big Blue filters. I’ve taken the canister apart several times but it still leaks from the large o-ring recessed into the canister. I leave the Ryobi battery out of the jury-rigged power connector when I don’t need water. That slows the leak quite a bit.

When you are off-grid you need a generator as backup in case a series of cloudy days runs the battery-bank down. Of course, the generator needs its own well-ventilated, soundproofed shed to keep the generator out of the elements and not drive everyone within a 4 square mile area crazy. I have almost finished the generator shed. I’ve got the floor poured, the wiring to the solar-generator transfer switch installed and complete but for some reason the wheels came off and the project stalled.

Lately I’ve been tinkering with an old Kawasaki Z900. If I run true to form and leave it 70% finished something will have to give. I could eliminate the brakes or maybe run 3 sparkplugs instead of 4. Tinfiny Ranch has more examples of my inability to complete a project. I estimate around 30% more. Hey wait a minute, this means we are nearly 70% done with this story. I guess that’s close enough.

Sniper!

A thing of great beauty…10 hand-rubbed coats of TruOil, glass bedding, a trigger job, and a consistent 10-ring shooter. My Mosin is 75 years old.

I’ve written before about the Mosin-Nagant rifle, and I thought I would return to that topic to tell you a little bit about how I got into playing with these fine old Russian infantry rifles.

I had seen Mosin-Nagants on the discount racks at what I had always considered low end gun outlets (Big 5 Sporting Goods and other general purpose stores), but I never considered purchasing one. The Mosins on the rack were filthy, caked in cosmoline with dinged-up stocks. They initially sold for $59 here in the US a few years ago, and they looked like $59 rifles to me. Cheap. Not up to my standards. I was and still am a gun snob. I thought the Mosins were too dirty to even handle, let alone purchase. Nope, not my speed, I thought. Any rifle that Big 5 was selling for $59 was not worth my time or consideration. Ah, if only I knew where prices were headed, and just how good these rifles are.

Fast forward a bit, and I was teaching a class on engineering creativity at Cal Poly Pomona. One of the techniques engineers can use to inspire their creativity is called TRIZ. It’s a technique that came to us from the old Soviet Union, and it involves looking at older designs in different product areas for ideas. A classic example is Paul Mauser’s bolt action rifle, which is said to have been based on a common gate latch (in fact, I used of photo illustrating this as the cover shot for Unleashing Engineering Creativity).

http://exhaustnotes.us/images/Books/UnleashingEngineeringCreativity.jpg

One of my young students approached me after class to tell me about the Mosin-Nagant he and his father had purchased (at Big 5) for under a hundred bucks, and how much fun they were having with it. That planted a seed, and when I stopped in for my weekly gun-gazing fix at a local gun shop later that week, I bought a Mosin they had on the rack for $129. The kid who showed it to me put it in the box when I started my 10-day waiting period (here in the Peoples Republik of Kalifornia we have a lot of goofy gun laws). What neither that young man nor I knew was that there was a bayonet in the Mosin-Nagant’s cardboard box, and when he slid the rifle into it, the bayonet scratched the hell out of the stock.

Live and learn, I guess. I wasn’t upset. In fact, I was glad. The rifle was inexpensive enough that I saw the bayonet scar as an opportunity to completely strip the rifle down, do a trigger job, glass bed the action, and refinish the stock. I did, and the rifle went from being a banged-up, gouged-up, cosmoline-encrusted derelict to…well, a thing of great beauty. I kid you not, as the saying goes. Every time I take my Mosin to the range, I get compliments. It’s the rifle you see in the photo at the top of this blog.

Russians like cosmoline, I guess. The cosmonauts apply it liberally.

But that’s not the whole story. The rest of this story is that the thing can shoot. I only shoot my own reloads, and the results are phenomenal. I have a jacketed bullet load I use and another load for cast bullets . Both are extremely accurate. My $139 Mosin is the most accurate open-sighted rifle I’ve ever shot. Who knew?

That accuracy thing is not unique to my rifle. My good buddy Paul bought a Mosin after listening to me rave about my Russky rifle (in fact, several of my friends bought their own Russian war horses after listening to me babble on and on about mine). Paul found out his rifle was a former sniper weapon, and he asked me to try it. I did. I put three of my reloads through it, and after firing the first shot, I thought I missed on the second two (the target was 50 yards downrange, and all I could see at that distance was one hole). When I looked through the spotting scope, though, it told a different story.

Paul’s sniper, after I put three rounds downrange. I offered to buy Paul’s rifle and start the 10-day People’s Republik waiting period immediately. “Nyet,” was his only reply.

The Mosin sniper rifles are amazingly accurate. When the U.S. military equips snipers, our armorers build the rifles from the ground up to assure extreme accuracy. The Russians did it differently. The Russians built approximately 17 million Mosin-Nagants from 1891 on, and they range fired every one of them. When they found a rifle that was particularly accurate, it was designated as a sniper weapon. It was one of those rifles you see in the photo above.

The price on Mosin rifles is climbing. Today they go for something north of $300. But trust me on this: They are still a bargain at that price. And wow, can they ever shoot. If you’ve ever thought about buying one, there’s no time like right now. I think prices are going to continue to climb.

We include gun stories here on the ExNotes blog because we like to shoot and we like to write about shooting. The feedback we get from you, our motorcycle blog followers, tells us you enjoy reading about gun stuff. The collection of ExNotes gun stories continues to grow, and we want to make it easy for you to find it. So, another bit of news…we’ve added a Tales of the Gun index page on the ExNotes site!

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