Question about 2002 Yamaha TT-R 250

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2001 yamaha ttr 250, starts, idles ok, bogs at acceleration

2001 Yamaha TTR 250, starts, idles ok, during acceleration at half speed it bogs, will only run at lower rpm. has new plug, cleaned air filter, fuel flow ok. Will increase speed slowly, fast acceleration bogs immediately.

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Has the bike been stored for any long length of time?
old fuel in the carburetor will turn to a varnish like residue blocking the jets,or possibly water in the carburetor.

Posted on May 03, 2010

Testimonial: "The bike was not stored and was ridden regularly, but it still sounds like it could be the carburetor. Thanks for your insight."

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I have the same bike and same problem. Check the intake hose that connects the carb to the motor it may have a crack mine did and lost power when the bike warmed up. They don't make a replacement hose for it so I am using a rubber plumbers coupling with hose clamps. Might work? The hose is inch and a half diameter and about three inches long try that maybe. Good luck If it makes a chirping sound when the bike gets warm it's probably that hose sucking in air and screwingup your mixture.

Posted on May 06, 2010

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