I finally got the T140 running, but with a top speed of only 80 mph, so the first step was a compression check. The drive side cylinder was about 110 psi with 60 psi on the timing side. Next a quick check with a few cc's of oil in the TS cylinder gave 100 psi indicating a ring problem. After removing the cylinder barrel the only difference I noticed was a scuff mark on the TS piston,
At this point I will do a cylinder hone with new rings, but I have some concern about this mark.
Does this mark tell me anything about why the compression was low?
The mark feels smooth and both cylinders look good, so is it safe to use the same pistons?