i am having a problem with a pred 90. the problem is it is backfiring at full throttle i was wondering if this could be a leak in the pipe? i installed a hetrick power kit stage C (pipe,clutch mods etc.) i also installed a cdi and a uni pod filter. i also installed a 120 main jet and boysen dual stage reeds. could it be any of these parts or should i be checking out the pipe? its all held together by springs. head pipe to engine then mid to head pipe. should i use automotive exhaust sealant in these joints?

 

what carb did u put on with all that u have done??it might not have the right amount of gas or the reeds might be it. i have a dinli and a scramble and 1 will take fiber reeds and the other will not run worth ****.so u are going have to try a little bit of everthing . see ya

 

how much increase in power have you seen with the powerup kit? was it worth all that money? my ten year old daughter needs more out of her predator 90 and i dont know if its a good idea to spend the money for the upgrades or get a bigger atv.