The BSA Workshop => Singles => Topic started by: maddogmargetts@yahoo.co.u on 25 Feb, 2025, 14:22
Title: M21 piston
Post by: maddogmargetts@yahoo.co.u on 25 Feb, 2025, 14:22
I took the head off my M21 and is has loads of oil in it plus the carb is blackened. Does this mean the piston rings have failed? I put +0.080" rings in but still have the same problem. Should I fit a larger piston, if so which is best please?