i just had a new top end put in do to low compresion. It still dont have real great compresion but i think after the break in it will be better i hope. but the probablem i have is when i take off it has a little hesatation.I also put new reeds and it does have some after market carbs on it.I am not sure if it is do to lack of compresion or the carbs just need ajusted.It seems to run great at high rpms.It also dont fire up on the first kick ever time .thanks guys