2002 Yamaha TT-R 250 Logo

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Bret L Snyder
Bret L Snyder Posted on Jul 21, 2009
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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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  • Anonymous 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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  • Posted on Jul 21, 2009
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Check air bleeds in carb next check exhaust port and pipe may be clogged as well as air intake

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I have 2006 TTR-250 with nomods and only 200 miles on it. Like another owner, I have problems running except on choke and have seen the pipe glowing red at idle. The bike has always been hard starting. ...
Well the glowing red header pipe and the fact that its hard to start is a pretty good sighn that your VALVES need adjusted.on a four stroke bike you have to adjust the valves about every 6 months to a year( and more often if you run it at high RPMs alot) i have both 2-strokes and 4-strokes bikes and have had this same problem with my 4-strokes(honda&yamaha) if you get a manuel and are somewhat mechanicaly inclined you can adjust them your self but if your not, i would take it in and have it done because if not done properly its easy to bend or break a valve( and i think yours has 4 valves.2-intake and 2-exhaust) And head work is not cheep!!!! but a adjustment on the valves is!!!!! good luck....
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