Description
The ProX Piston Kit for Yamaha GP1300R 83.91 mm B size is intended for cylinders that fall into the middle of the factory bore tolerance range. Matching the correct B size piston helps control operating noise, ring stability, and long term wear in this high output fuel injected engine. It keeps the lively GP1300R personality while renewing tired top end components.
- 83.91 mm B size piston kit for Yamaha GP1300R engines with mid?tolerance OEM cylinder measurements.
- Includes B size piston, ring set, wrist pin, and circlips as a complete top end group for one cylinder.
- Low expansion, low friction alloy supports precise clearances under sustained high rpm personal watercraft use.
- CNC machined crown and skirt help maintain efficient combustion and smooth operation with stock mapping.
- Suitable for stock and lightly modified skis used in aggressive recreational or club level riding.
Installed in a properly honed B?grade cylinder, this ProX kit can restore crisp starting, clean idle, and strong pull all the way to the limiter. The ring package is configured for quick seating and reliable sealing, helping reduce blow by and oil contamination. Riders benefit from predictable, OEM like behavior with renewed strength.
Engine builders should confirm cylinder classification as B with accurate measurements, then set ring gaps and piston to wall clearances according to guidance. Fresh gaskets, correct torque procedures, and clean cooling passages all support longevity. With proper assembly and break in, the ProX 83.91 mm B size GP1300R piston kit can deliver many seasons of reliable performance.
