Take the barrel off the piston, check the rings are free to move around and no gummed up and the recess is clear, line up rings , compress and insert piston into barrel if a tight fit they should be fine if to easy the rings are done. If standard barrel should be easy to source if not a micrometer could measure more accuratly
Proud to say what I mean if you know what I mean and if you don't please feel free tto ask me over a pint and your buying
Cheers Boys -- not sure how many miles the rings have done -- I've done a good 10k since I got the engine replaced -- not sure how many miles it done before I got it -- I think the feeler gauge might be the ticket.
If I do need new rings how do I know what size? do I just micrometre the piston diameter?
aye, pal -- I think I've done 3 seasons worth on it, maybe just 2 now I think of it & I get close to 3k a year, the issue might be how many clicks it done before I got it -- the compression is poor, struggles to start hot BUT runs well ??