This is a aftermarket Rotax 503 top overhaul kit featuring 2 new moly coated pistons, oem style w/dual rings, pins, circlips , TOP end 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. We run em in our trikes and use them in our shop for the past 10+ years
This is set is for 72.25 mm bore 503 Rotax. .25mm oversize .010", these pistons take up to 7 days via special order.
International orders to certain countries will require that u pay via the paypal option and and additional express mail shipping charge of $68.00 that we will invoice you for separately after your purchase.