Description
The ProX Piston Kit for Yamaha GPR800/1200 C size is designed for cylinders that measure at the larger end of the OEM tolerance band. Using the correct C grade piston maintains appropriate clearance and minimizes cold piston noise while still supporting reliable high rpm operation. It is a smart choice when refreshing an engine that has seen use but still remains within service limits.
- C size standard bore piston kit for Yamaha GPR800 and GPR1200 engines with larger factory bore measurements.
- Supplied with C size piston, ring set, wrist pin, and circlips to renew one complete cylinder assembly.
- Forged from a durable low expansion, low friction alloy for stable operation in demanding two stroke environments.
- Precision CNC machining ensures accurate skirt profile, ring land geometry, and crown shape for consistent combustion.
- Intended for riders who push their skis hard yet want OEM like reliability and manners.
When matched to a lightly honed C grade cylinder, this ProX piston helps restore compression, improve throttle response, and smooth overall engine behavior. The ring package is configured to seal well at higher clearances while resisting excessive wear, making it suitable for long days on the water. Combined with sound tuning and lubrication practices, it keeps GPR engines feeling strong and responsive.
Builders should carefully gauge cylinders to confirm C classification, then check ring gaps and piston to wall clearances against recommended figures. Replace old gaskets and seals, verify crankshaft and bearings are in good condition, and ensure cooling passages are unobstructed. With proper assembly technique and a controlled break in, the ProX C size GPR800/1200 piston kit can provide many additional hours of confident Yamaha performance.
