{"id":8151,"date":"2020-04-05T14:23:07","date_gmt":"2020-04-05T21:23:07","guid":{"rendered":"http:\/\/exhaustnotes.us\/blog\/?p=8151"},"modified":"2020-04-05T15:28:46","modified_gmt":"2020-04-05T22:28:46","slug":"if-your-tt250-wont-idle","status":"publish","type":"post","link":"https:\/\/exhaustnotes.us\/blog\/index.php\/2020\/04\/05\/if-your-tt250-wont-idle\/","title":{"rendered":"If your TT250 won’t idle…"},"content":{"rendered":"

When you don’t run a carbureted bike for a while and it runs rough or won’t idle, it’s probably because the slow jet is clogged.\u00a0 It’s not from dirt or contaminants getting into the fuel; it’s from the fuel itself. \u00a0 The fuel congeals when the bike sits for an extended period (we’re talking months here), the jet clogs, and your bike just won’t idle or run well at small throttle openings.\u00a0 That often occurs if you let your bike sit over the winter.\u00a0 One way to potentially avoid this is to close the petcock and run the bike out of fuel when you’re done riding. \u00a0 I don’t do that, though, mostly because I don’t want to let the bike idle for an extended period and, truth be told, I’m lazy.<\/p>\n

I wrote the CSC maintenance tutorials<\/a> for the TT250, so I had a bit of a leg up doing this myself on my TT250 when I had the problem recently.\u00a0 I hadn’t ridden my TT250 in a few months, it was hard starting and I couldn’t get it to idle when I finally did get it to start.\u00a0 I knew what was going on immediately:\u00a0 It was the slow jet clogging. \u00a0 All carbed bikes will do this (it’s not a problem unique to the TT250).<\/p>\n

Everything I’m showing you here is right out of the CSC TT250 carb maintenance tutorial.\u00a0 That tutorial covers everything about the carb. This blog is specifically focused on cleaning the slow speed jet to address the idling and slow speed roughness issue.<\/p>\n

I find the best way to do this is to pull the carb off the engine.\u00a0 To do that, you’ll need to remove the bike’s side panels.\u00a0 Close the fuel petcock and remove the fuel line from it to the carb (you’ll spill a little gas, so don’t do this around open flame or heat).\u00a0 Like a lot of maintenance actions on modern motorcycles, half the job is just removing stuff that’s in the way first.<\/p>\n

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Disconnect the duct that goes to the airbox and pull it off the carb.<\/figcaption><\/figure>\n
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You don’t have to disconnect the duct at the airbox end; just take off the end that attaches the carb.<\/figcaption><\/figure>\n
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Unscrew the top of the carb.<\/figcaption><\/figure>\n
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Remove the slide from the carb.<\/figcaption><\/figure>\n
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Working from the left side of the bike (opposite the carb) remove the bolt securing the rear brake fluid reservoir and let it hang free. You need to do this to get to the carb mounting bolt on the left side.<\/figcaption><\/figure>\n
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Unbolt the carb from the cylinder head. The nut on the right is easy to get to; the nut on the left side of the carb is a bitch to get to, which is why we moved the brake fluid reservoir out of the way.<\/figcaption><\/figure>\n

At this point, you can remove the carb from the bike, and then the float bowl from the carburetor.\u00a0 This will provide access to the jets.\u00a0 Some folks might think that you can remove the float bowl with the carb still on the bike, but I’ve not found a way to do that.\u00a0 It’s best to do it the way I describe here.<\/p>\n

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Undo the three screws securing the float bowl to the carb.<\/figcaption><\/figure>\n
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Remove the float bowl. You’ll spill a little gas here, so be careful.<\/figcaption><\/figure>\n

After have removed the float bowl, you’ll be able to see the jets.\u00a0 The one we’re interested in here is the slow jet. \u00a0 Remove it with a flat-bladed screwdriver.<\/p>\n

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The slow speed jet is the main character in this “won’t idle worth a damn” story.<\/figcaption><\/figure>\n

After removing the slow jet, clean it thoroughly.\u00a0 This involves cleaning all the orifice holes on the sides of the jet, and the main hole through the inside diameter of the jet. \u00a0 You need to use a thin wire to do this.\u00a0 Just blowing it out with carb cleaner or WD 40 won’t dislodge the tiny bits of congealed fuel.\u00a0 There are tools to do this (CSC Motorcycles<\/a> sells them).\u00a0 I used a small diameter brass wire and it got the job done.<\/p>\n

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Use a wire to clean the slow jet and then blow it out with carb cleaner or WD40.<\/figcaption><\/figure>\n
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Looking down the bore of the slow jet.<\/figcaption><\/figure>\n
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Make sure you use the wire to get everything out of all the holes.<\/figcaption><\/figure>\n

Once the slow jet is clean, reinstall the jet in the carb. \u00a0 There’s no adjustment here; just screw it in taking care not to overtighten it.<\/p>\n

After you’ve done the above, assembly is the reverse of disassembly.\u00a0 Your bike should start easily, idle, and run well at small throttle openings.<\/p>\n","protected":false},"excerpt":{"rendered":"

When you don’t run a carbureted bike for a while and it runs rough or won’t idle, it’s probably because the slow jet is clogged.\u00a0 It’s not from dirt or contaminants getting into the fuel; it’s from the fuel itself. \u00a0 The fuel congeals when the bike sits for an extended period (we’re talking months … Continue reading “If your TT250 won’t idle…”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":true,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[369],"tags":[1109,78,297,1111,1110],"class_list":["post-8151","post","type-post","status-publish","format-standard","hentry","category-zongshen","tag-cleaning-tt250-carburetor","tag-csc-motorcycles","tag-csc-tt250","tag-tt250-slow-jet","tag-tt250-slow-speed-running"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/exhaustnotes.us\/blog\/index.php\/wp-json\/wp\/v2\/posts\/8151","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/exhaustnotes.us\/blog\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/exhaustnotes.us\/blog\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/exhaustnotes.us\/blog\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/exhaustnotes.us\/blog\/index.php\/wp-json\/wp\/v2\/comments?post=8151"}],"version-history":[{"count":4,"href":"https:\/\/exhaustnotes.us\/blog\/index.php\/wp-json\/wp\/v2\/posts\/8151\/revisions"}],"predecessor-version":[{"id":8172,"href":"https:\/\/exhaustnotes.us\/blog\/index.php\/wp-json\/wp\/v2\/posts\/8151\/revisions\/8172"}],"wp:attachment":[{"href":"https:\/\/exhaustnotes.us\/blog\/index.php\/wp-json\/wp\/v2\/media?parent=8151"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/exhaustnotes.us\/blog\/index.php\/wp-json\/wp\/v2\/categories?post=8151"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/exhaustnotes.us\/blog\/index.php\/wp-json\/wp\/v2\/tags?post=8151"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}