This is a aftermarket top overhaul kit featuring 2 new pistons, oem style 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 hard crowned moly coated pistons. See other listing for non coated Smoother running due to better balance, stronger 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 73 oversize bore 503 rotax. Gives your 511 CCs.
International orders will require that u pay via the paypal option and and additional express mail shipping charge of $78.00 that we will invoice you for separately after your purchase.