hi i was wondering if anybody can help me i have a ZS167FMM zongshen 250cc 4 stroke dirtbike i recently tried rebuiding the top end but i dont have a manual or anything to help me .....is there any won out there with a pdf or a manual that i can print .....i replaced rings ..put it back together ...had almost 120 compression then some how lost it and all i got is 30 psi now ....NEED HELP PLEASE