TheZiggys Posted June 11, 2008 Share Posted June 11, 2008 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? Link to comment Share on other sites More sharing options...
Guest intruder Posted June 11, 2008 Share Posted June 11, 2008 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. Link to comment Share on other sites More sharing options...
Moderator Airhead Posted June 11, 2008 Moderator Share Posted June 11, 2008 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 Link to comment Share on other sites More sharing options...
Moderator drewpy Posted June 11, 2008 Moderator Share Posted June 11, 2008 check its not running at 45' ie too lean!!! Link to comment Share on other sites More sharing options...
TheZiggys Posted June 12, 2008 Author Share Posted June 12, 2008 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!!! " ? Link to comment Share on other sites More sharing options...
Moderator Airhead Posted June 12, 2008 Moderator Share Posted June 12, 2008 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! Link to comment Share on other sites More sharing options...
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