Posted June 11, 200816 yr I just got a 2000 XT350 it seems to be backfiring through the carb. It starts good but when it gets warmed up it misses and backfires through the carb. I changed the spark plug and looked for air leaks. Changed the secondary carb inlet which the rubber had separated from the mount. The air filter is clean I even left the cover off while l ran it but no difference. I checked the gas flow from the petcock and it's full stream. I'm stumped! Also do these bikes always run so hot?
June 11, 200816 yr hi.sounds like you have no clearance on one or more valves. which will cause backfiring. worse when hot. check clearances by getting piston at top dead centre on compression stroke then check all valves have clearance.this must be done with cold engine. intake valve 0.08mm. exhaust valve 0.15mm.
June 11, 200816 yr Moderator hi.sounds like you have no clearance on one or more valves. which will cause backfiring. worse when hot. check clearances by getting piston at top dead centre on compression stroke then check all valves have clearance.this must be done with cold engine. intake valve 0.08mm. exhaust valve 0.15mm. What he said
June 12, 200816 yr Author check its not running at 45' ie too lean!!! You lost me what do you mean "check its not running at 45' ie too lean!!! " ?
June 12, 200816 yr Moderator You lost me what do you mean "check its not running at 45' ie too lean!!! " ? 90' is upright, 45' is too lean Its English sense of humour!
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