Question about 2002 Yamaha TT-R 250

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Idles with choke on - dies immediately with choke off

Will only start with choke on - if I let it run with choke on the exhaust pipe glows red. I can take the choke off if i keep reving it and the pipe quits glowing. It will not keep running with choke off. I replaced the diaphram and the two o-rings also the needle valve had a bad o-ring I replaced it too. I'm at a loss. I cleaned the carb very good. Help!!

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  • James Brody
    James Brody Aug 09, 2013

    Your pilot circuit is not working right.You got an air leak somewhere in the carb. In my case it was the after market fuel/air screw. The o-ring wasn't seeding properly. Check your hot start and choke to make sure they are fully closed in the off position. Make sure your fuel/air screw is working properly. Check the boot on the front off the carb for a leak. Start the bike and spray starter fluid around the carb. If it rev's up, replace the boot. Hope that help. These are tricky to trouble shoot and get right. Good luck.

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Check air bleeds in carb next check exhaust port and pipe may be clogged as well as air intake

Posted on Jul 21, 2009

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Sep 03, 2010 | 2002 Yamaha TT-R 250

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2006 TTR250. Bike will not idle unless choke is fully engaged. After a minute or less of this the head pipe (the one that comes right off the block, I don't know if I have the name right) becomes glowing...


two things you have to oberved. Choke is only applicable if you experience hard starting in the morning,If yes then use choke for a while till you got your motor idling stage.the glowing red hot indicates that your engine is flaming hot, this means your choke is steadily on.( never stay your choke steadily on.).Try to clean your carb , carb cleaner will do. even without dismantling your carb from the engine manifold.Rev your throttle and spray through the air intake, you'll notice a foul sound bcoz the cleaner is mixing with your gas,it's fine.also you'll notice a black smoke while doing a full rev. it's also fine , thats the carbon that need to push out from your carb. take it from there my friend ...let me know the result.observed your bike

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