i have a quik question, why do four-wheelers backfire? and is it bad for the Wheeler? [img]i/expressions/face-icon-small-confused.gif[/img]

 

Could be fouling plug,running lean, electrical problem,etc. Replace plug first,easiest and cheapest to do at first! See if helps.

 

[img]i/expressions/face-icon-small-smile.gif[/img]ok thank you very much!!! i have another question the other week when i was out riding this is when it back fired and then it just died and now it just wont start help me out please. [img]i/expressions/face-icon-small-blush.gif[/img]

 

GIVE me a little more info! What machine is it??

 

i believe it is an 04 polaris Sportsman 500

 

could have jumped time. flywheel sheared woodruff key and spun on the crank

 

um, well i dont really know alot about four-wheelers so do you mind explaining these terms to me a little more please?

 

the flywheel is what tells the motor exactly where it is in the combustion cycle. therefore it is keyed to the crankshaft so that it is always in the same location after it gets removed for whatever reason. the key it made out of a soft metal so if the motor backfires (which usually tries to send the piston in the opposite direction of its natural travel) the flywheel is still trying to spin the direction that it was going and the crank will usally go the opposite way. think of it as a shear pin. something has to give when that happens.

 

thank you very much for explaining it now i understand a little more. so is it bad for the motor when it back fires?

 

some times. other times its just a quirk. but if it is backfiring that means something is wrong. either the carb isnt adjusted properly or a valve is out of adjustment or the sparkplug is fouled. could be any number of things. kinda hard to pinpoint it over the net without being able to see it happen.