When rebuilding any four-stroke or two-stroke engine replacement of the
Piston Rings is a sensible precaution.
They have a particularly hard life and can go brittle with the high running temperatures they are subject to, leading to the rings actually breaking up! This is a disaster for the engine, causing massive damage to the bore - sometimes beyond the scope of reboring!
A related item you may wish to replace:
13103259010
Replace as a matter of course when rebuilding the engine. Have you thought about trying our pro-workshop gasket sealant - 08C70K0234M - take your engine building to a more professional level!