Vintage Kawasaki – The ExhaustNotes Blog

By Joe Gresh

I’m starting to worry about the timeline on this Kawasaki project. It’s already almost June and we will be leaving for Laguna Seca the beginning of July. Parts are trickling in slowly now and I’ve found things to keep me busy. I don’t want to ride the Yamaha RD350 all the way to California but I will if it comes down to it.

After assembling the rebuilt front calipers onto the 1999 ZRX1100’s forks I tried to flush out the brake lines with a can of spray brake cleaner stuff. No go as all three of the hoses were clogged so badly I couldn’t get a drop of liquid out of them. I guess old brake fluid turns into a solid after many years. A piece of stainless wire, sort of stiff, was worked back and forth into each line pausing occasionally to give the line a squirt. It was slow going but my thrifty ways were rewarded when I managed to force the wire all the way through the hose. Now I could really give the inside of the line a good, high pressure blast with the brake cleaner and air compressor.

I had the same problem with the rear brake hose and solved it the same way. Bleeding so many pistons takes patience and I don’t rush to do the thing in one day. The tiny bubbles take a long time to percolate to high points and I’ve got rear pedal pressure fairly good now. The front calipers are taking a bit longer. I have solid line pressure but I think there might be a bubble or two occupying space that should be DOT 4 fluid.

The Kawasaki ZRX has a lot of black painted parts. I love this even though most of the black paint was rusty and flaking off. There’s nothing easier than applying black paint. It’s a popular color and if it’s a shade or two off no one will notice. I gave the handlebars and water pipes a shot of Rust-Oleum engine paint.

This brand of paint seemed to mix well with the original Kawasaki paint. I tried another brand but it lifted the old paint at the margins where old paint meets bare metal.

The clutch slave cylinder leaked onto the sprocket cover area eating the paint so I wire brushed the cover, along with the slave cylinder cover and shot them with the same black paint.

Removing the four carburetors out of a ZRX is no easy feat. The book says to pull them from the air intake side first, and then slide them out of the manifolds on the cylinder head side. Well, I’m here to tell you that method doesn’t work. It was a battle but I had to slide the carbs out of the manifold first then work the air cleaner boots back with a screwdriver. I’m dreading putting the carbs back in. I think I’ll use a thin flat piece of steel on the air cleaner side to push the boots back without snagging the carbs.

The carbs were gummed up with old gooey gasoline but they weren’t the worse I’ve seen. Luckily all the vacuum diaphragms were intact and flexible. I had to remove the factory, no-tamper idle screw plugs to clean out the idle passage. Oddly, one idle screw was set to 1-3/4 turns out while the rest were +1-ish turn out. I’m going to split the baby and make them all 1-1/4 turns out to start. Located on the bottom of the carbs, these idle screws are somewhat accessible while the carbs are still on the bike so I can adjust them later if needed.

After cleaning all four carbs and reassembling them I wanted to bench test for leaks before facing the gauntlet of those rubber boots. I set the carbs in the vise and rigged a funnel to pour gas in. The gas ran out #4 carb as fast as I put it in. Taking the #4 float bowl off and inspecting the needle and seat revealed nothing so I cleaned the seat and rubber tipped needle again and ran another test. No change; the gas flowed like wine. I have ordered four new float needles so we will have to revisit the carb issue later.

After 25,000 miles I felt it was time to do the Kawasaki-recommended 12,000-mile valve clearance check. As expected, they were all at the minimum gap specified or too tight. With 16 valves it’s easy to get mixed up with your adjustments so I made a chart to keep track of which valve needed what shim.

Kawasaki made the valve setting process easier by using cam follower type rockers. These rockers are mounted on a long shaft that runs through the cylinder head. The rockers are held in place over the valve stem by springs on the rocker shaft. This means you can slide the rocker over on the shaft and lower it so that the valve spring keeps the rocker from returning to its original position. No more having to swap in a shim just to rotate the cams to the next valve that needed setting. I was able to measure all the valves and determine what size shims I needed in two rotations of the crankshaft. After swapping the shims I could, I ended up needing seven shims in total. The local Kawasaki shop had them for $4 each.

I was going to use a new valve cover gasket but the thing costs like $80. That’s too much for a big rubber ring. My plan is to dollar cost average and get one more use out of the old gasket. I’ll splurge on a new gasket at 50,000 miles…maybe. The cover looked pretty bad so I cleaned it up and shot it black with the same paint as I used on the coolant pipes. The gaskets on the crankcase breather reed valves tore when I removed the plates for painting so I ordered the four total gaskets at $30. This motorcycle repair business sure is expensive.

In Rex Rx Part 5 I hope to start getting closer to starting the beast. I’m waiting on bits and pieces so it might be time to do a few days of concrete work.

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Miss the first four installments? Hey, check them out here:

ZRX Rx 1
ZRX Rx 2
ZRX Rx 3

More Resurrections? You bet!

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Blinkers on a dirt bike are kind of silly but lately I’ve been running The Widowmaker, my 2005 KLR 250, on the street more than is right or just. The KLR250 spends most of its time in Florida and the automobile drivers in that state are legendarily bad. With Nearly-Deads behind the wheel and blind rage as their co-pilot any blinking light that may draw attention is a good thing.

The Widowmaker’s blinkers have had a rough go of it. They worked fine when I bought the bike but several thousand miles of the Trans America Trail managed to put a pronounced sag in the rubber stalks holding the lamp fixtures. The rubber soon cracked and the blinkers hung down swinging on their electrical wires.

At first I managed to keep the original stalks in the game using the KLR rider’s best friend, duct tape. Soon the tape was not enough and I progressed to beer can wraps, bailing wire and spit. The rubber stalks crystallized and began to crumble into small, hard black cubes. It was a metamorphosis: soft, pliable rubber became fragile like chalk. The lamps, now free from their moorings swung in a crazy amber half circle pointing towards the ground. As they filled up with water the light fixtures quit blinking and they became memories of directional indicators slapping the side of the motorcycle.

I couldn’t find replacement stalks online. The complete blinker is sold as a unit and when your motorcycle needs as much attention as mine you can’t blow a bunch of money on parts that will break off soon anyway. I dismantled the old blinkers and decided to try to fix them for two reasons: Because I’m cheap like that and KLR riders will always take the hardest path.

Two of the direction lamps weren’t rusty and came apart fairly easy. The rusty ones were more of a challenge. I had to soak them in penetrating oil and break the glass bulbs in order to remove the bulb base from the socket using pliers. After getting them apart I soaked the rusty bits in Evaporust for a few days and then painted the reflector and socket a fetching metallic silver.

Making new stalks was a conundrum: I needed something stiff enough to hold the lamp in position but flexible enough to bend during a crash, preventing destruction of the blinker lens and housing. I toyed with the idea of two thin strips of sheet metal to provide a malleable stem that could be bent back into position. I debated welding a thin tube between the threaded ends but didn’t have any tubing that would serve the purpose.

I settled on ½” Pex plastic plumbing tubing mainly because it comes in a red color than neatly matches The Widowmaker’s faded bodywork. The Pex copper crimp rings would make for a neat finished end to the Frankenstalks. The only problem was the threaded ends salvaged from the old rubber parts were a little too big for the Pex pipe.

I really could have used the South Bend lathe to turn down the ends but that project is not completed yet so I had to chuck the parts into a hand drill and grind them to size. Even cut down they were still too large for the Pex but I didn’t want to grind any more and lose the knurling. It’s amazing how a new tool opens up avenues of creativity. It frees your mind, man. My new tubing expander (bought for an air conditioning job) made short work of the Pex inside diameter and the threaded inserts fit perfectly.

Next I used the tubing expander to resize the copper Pex crimp rings to fit the expanded pipe. Things were going well. After crimping the copper rings with a hydraulic cable crimper the stalks looked like 100 bucks.

The grinding process put a divot in the threaded end so I had to run a 10mm die over the things to straighten out the divots. With 4 new blinker stalks it was only a matter of time before everything was reassembled and back on the motorcycle. I’ll need to put a battery in to see if the blinkers actually work (I’m using the same battery in the Z1, the Husky, and the KLR) but I remain confident they will work at least as good as they used to. Which is not at all.

A few questions remain. Will the crimped ends stay put on a rough trail? I assume they will rip out during a crash and that’s good. My new stalks cost about 67 cents apiece so I can replace them as often as I like. Will the plastic tube droop leaving me with a sad-eyed KLR250? Will the bike require a plumbing inspection now? I don’t know the answers but I’ll report back if these Frankenstalks actually work.