Bought this bike for my wife and slapped on a pipe and followed the pipe jetting recommendation to bump up the main a couple and the pilot 1 size. Well the bike runs fine throughout the powerband. It almost feels a little too fat but it pops alot on decelleration. I wouldn't figure the jetting would of changed much on a little 4 stroke from adding a pipe. I'm sure I'll figure it out but I'd figure I would post it here because the carb is a pain to get to. Anyone who has this bike piped did you leave it stock or what jetting/ also how many turns out on the screw? I was alos thinking maybe there's a leak in the exhaust. I didn't change the gasket from the headpipe to the head. Might that be it.

Thanks

Could be a leak in the system somewhere or it could just be thats what that pipe does on a hard decelleration. Its not uncommon. As long as the power is good all the way through I would say its not the jetting.