This is a aftermarket top overhaul kit featuring 2 new 1st oversize pistons, moly coated for low friction, dual rings, pins, circlips , bearings, full major overhaul gasket w/ crank seals kit as shown. This set exceeds the MFGs specs , Designed to replace the oem elkos in all respects.
Smoother running due to better balance, stonger and better heat transfer. These are 40% stronger and feature moly coated skirts to reduce friction and heat.
We run em in our planes and use them in our shop for the past 10+ years
This is set is for 76.25 mm 1st oversize bore 618 rotax. any head color