Have you just purchased the bike like that or is it something that has just started to happen? Have you made any changes to the bike as far as pipe,header,air filter? Many ATV mechanics will tell you the Warrior does not need much when making changes like that ,"THEY ARE WRONG!" I was told by several that they do NOTHING but maybe change the MAIN JET, if at all that ....................... WRONG ANSWER!!! It depends on what you have done to the bike & elevation,compression etc....... I put on a FMF header,FMF Silencer, K& N air filter & I had to change my main jet,pilot jet & adjust my needle clip ....... Do not get down it takes patients & usually is something really small & simple !!!!!!