Rings and cylinders in both engines. first one had deep score in the cylinder wall and there was only a small amount of compression enough to last 2 seconds before it always quickly died again.. had to push the bike 3 hours in the middle of hot day! not fun at all..
The second one stopped completely after doing a burnout on some dirt.. lucky I wasnt too far from home otherwise I would have probably just left it there
Both engines lasted me a long time but this one that I got is going really strong, plenty of compression and has already something like 6000-7000 miles on it
must have done a good job running it in..