Join Date: Mar 2017
Location: Ojibwe Gichigami
Liked: 2907 times
Look inside the intake and exhaust ports for heavy oiling evidence of leaky valve seals.
Take the wristpin from the piston and push the end of it into the top of the rod. Don't center the pin... just push it in until the end of the wristpin is flush with the other side of the rod and move the long end of the wristpin up and down. If you notice any play at all between that rod and wristpin end, the rod has gotta be replaced.
1mm oversize bore is the max so if the bore is worn out of spec, or measures tapered, out-of-round etc, you'll need another cylinder.
Also take pics of each side of the piston 90 degrees from the wristpin bore, the skirt sides in other words... so we can see the thrust-side wear on the piston.