Pro X Piston - Skidoo Rotax 800 PTEK 08-12 & ETEC 12-18ProX pistons are precision machined on the latest, state of the art CNC equipment. The same low expansion, low friction piston alloy is used as is used for all major Japanese engine manufacturers. ProX Piston Kits are a first class solution to replace the original piston in your Motorcycle, Scooter, Moped, ATV, Personal Watercraft, etc. High quality cast piston Made from special alloy for extra strength and reduced expansion Special dual ring set up