Shees actin up

[03bansheeman126]

I took it out for a ride just a minute ago and everything was fine at first then it starting acting up. I could hear a hissing noise like air leaking when the motor was running thought it was a tire til i turned it off and it quit. Also right before that the throttle response was horrible. It almost acted like it just didnt want to go. the thing is all stock with a set of toomeys and a k&n. any ideas?

[T_Shee]

what do the plugs look like?

 

[sleeper06]

You might have an air leak , pressure test that bitch b4 you drive yourself crazy,Two things I do every time a quad gets in my hands,compression test,pressure test,this way your not chasing your tail