is it OK to lap in the original valves on this? will I destroy any hardened coating on them? The seats are basically OK but I,m doing the stem seals while I,m in there for piston change and minor decoke.
Doing the piston change at 150 hours , Teflon pad almost gone piston skirts slightly polished but barrel OK.
When would you consider changing the cam chain? Book suggests same time as piston but I think this maybe on the cautious side?