What is the sizes on new & worn rings on Bajaj RE205 Piston

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The size of the ring will be determined by the bore size
so if it is a 3"(75mm) bore the ring will be that size if placed in the bore separate to the piston and pushed square and to the bottom of the bore the ring gap will denote if standard , worn or oversize to standard
new rings in new bores will have a ring gap of around .010"
worn rings will have a larger gap up to .040" and will have sharp edges where the ring lands wear the rings
over size rings in standard bore probably won't even fit in the bore to start with
ring sets are bought in standard size , .010" over size,.020" oversize,.030" oversize,.040" oversize with the oversize equalling the final hone of a machine bore
so if the machine shop bores the cylinder out to .020" oversize then you need .020" oversize rings to maintain the correct ring gap
from experience I have found that if I follow that rule , on measuring the ring gap at the bottom of the bore the ring gap is about .015" or half worn out
I counter this by getting the next size ring .030" and filing the ends of the rings at the gap to obtain the .010" gap This has produced better longer lasting repairs