Question about 2002 Yamaha TT-R 250

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I have a 2006 kx250f engine seems to be running fine but at 1/4 throttle engine seems to be bogging or missing a bit

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I would start out with the basics first: clean air filter, new spark plug, fresh fuel. Then move to the intake and exhaust and check for leaks. A loose carb or adapter, a leaky exhaust seal. The exhaust uses a copper ring seal, they have a tendency to wear out or be vulnerable to a header that has been knocked out of alignment. If everything still checks out, try cleaning the carb, and be sure to remove all jets and blow compressed air through all passages. Next I would check for valve clearances, and if your capable, a leak-down test to check for a worn top end or valves. If the problem has seemed to be for most of the bikes life, you may want to try rejetting the bike to fine tune your low-speed circuit.

Posted on Jun 18, 2009

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Posted on Jan 02, 2017

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