i just put an lrd full exhaust and they recomended the main jet of 170 i did that they also recomended putting the needle on the forth notch this is the only thing i haven't done my question is since i havn't moved my needle yet is that the cause of the bike still running alittle slugish at 3/4 throttle and up? it even sends alittle spark out of the pipe at high rpm''s. is this because of the new pipe or normal? please help quick!!!! need it fixed tonight!