Top end rebuild.. Need help

[jwillie0950]

Ok so i had 70 psi in the left hole and 90 in the right. Pistons are a little scarred which is my fault from modifying the airbox without rejetting so i think i leaned it out too much, but after looking at the pistons they look pretty good besides minimal scaring and the sleeves also look good. So what could be the cause of my low compression?

[Zillaguy]

Bad rings, egg shaped cylinders, stuck rings, bad head gsaket.... Either way it needs to be rebuilt... I'd start with having a clean up bore done on the cylinders, with NEW pistons.