I noticed on 3 of the slant 80cc from Zoom that the gears on the right side are not alligned. Aside from the gear wear issue on one the crank is so far right the flywheel is contacting the case. Shim something up on the magneto side? On another it appears the clutch shaft is too far to the right causing gears to be offset in the other direction. Maybe something shifted when banging that shaft out to work on the clutch. Shim something up on the drive gear side?