i brother has just redone the bottom end of his atc and he wants to put in a big bore but hes not sure what to get. the 350 kit or the 330 kit, he wants torque for the dunes but people were telling us the 330 and the 350 are just about the same thing? so were not sure what to get. so which one should we get?

 

i went with the 350 but am yet to install it. if he does go with a 330, make sure its a full skirt and not the bolt on 330. the bolt on 330 needs a new sleeve every time it needs to be bored (or so ESR says).

Im going with the 350 for the most low end grunt but the porting is going to be mid-high. some builders believe the port area to work with isnt enough to feed a 350, but ive riden TRX350R's and they make enough power for me.

 

get the 350 with out a dought. did your brother have his cases bored for a big bore sleeve??????.