The ProX Cast Piston Kit is an OEM-style 2-stroke replacement built for stable performance and reliable top-end rebuilds. Gravity-cast aluminum alloy with ~18% silicon helps reduce thermal expansion for consistent running.
The ProX Cast Piston Kit is a high-quality, OEM-replica solution for refreshing your 2-stroke top end with dependable fit and stable operation. ProX piston designs closely follow stock specifications, with refinements made when engineering opportunities for improved performance are found. Thanks to a gravity-cast aluminum alloy construction with approximately 18% silicon content, the piston is designed to be very stable and to help reduce thermal expansion—supporting consistent clearances and reliable running.
If you're rebuilding to restore compression, reduce blow-by, or bring back crisp throttle response, this kit provides the core components needed for a proper piston replacement and is suitable for both cast iron cylinder bores and Nikasil cylinder bores.
