This is a top overhaul kit featuring 2 new aftermarket  pistons, w/dual rings, pins, circlips , 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.

These are becomming hard to get, get while they last

 Smoother running due to better balance, stonger and better heat transfer. We run em in our trikes and use them in our shop for the past 9+ years

This is set is for std 62.0 mm  bore  377  rotax

other sizes are available