Description
The ProX Piston Kit for Yamaha 760/1200 1.00 mm oversize is built for engines that need substantial cylinder cleanup after heavy use, scoring, or previous rebuilds. This larger overbore helps recover straight, round bores when standard and 0.50 mm pistons can no longer achieve correct clearances. It lets owners keep trusted cylinders in service instead of replacing them outright.
- 1.00 mm oversize piston kit designed for Yamaha 760 and 1200 two stroke platforms that require a major overbore.
- Includes oversize piston, ring set, wrist pin, and circlips to replace all primary top end moving components.
- Low expansion, low friction alloy maintains stable fit from cold start to wide open runs in hot summer water.
- CNC machined crown, skirt, and ring grooves promote efficient combustion and reliable ring sealing.
- Suitable for recreation, freeride, and mild competition builds where long term durability still matters.
When installed in a correctly bored and honed cylinder, this ProX kit can restore strong cranking compression, reduce piston noise, and clean up exhaust haze. Riders feel quicker planing, better throttle response, and more confident mid range pull, especially on heavier three seat skis. The ring package is tuned to seat quickly on a proper cross hatch while maintaining sealing over many hours.
Engine builders should confirm final bore size at multiple heights and directions, set ring end gaps carefully, and verify piston to wall clearances against ProX or OEM guidelines. Inspect crankshaft and bearings, renew base and head gaskets, and make sure cooling passages are free of scale. A sensible break in period with quality two stroke oil will help the ProX 1.00 mm kit deliver reliable Yamaha 760/1200 performance season after season.
