Description
The ProX Piston Kit for Yamaha SHO and FZR/FZS 8.6:1 C size is configured for 1.8L supercharged engines whose cylinders measure at the larger end of the OEM tolerance band. Using the correct C grade piston maintains appropriate running clearance and helps control piston noise while preserving reliable sealing under boost. It is a solid option for higher?hour engines that still fall within serviceable limits.
- C size piston kit for Yamaha SHO (2008?2011) and FZR/FZS (2009?2012) 1.8L 8.6:1 compression engines.
- Kit includes C size piston, ring set, wrist pin, and circlips to renew one cylinder?s piston assembly.
- Forged from a durable low expansion, low friction alloy and CNC machined for precise fit in larger?tolerance bores.
- Crown and skirt design support stable combustion and smooth running with stock or mildly tuned calibrations.
- Intended for riders who push their supercharged skis hard yet demand OEM?like long term reliability.
Installed in a correctly honed C?class cylinder, this ProX kit can restore lost compression, improve throttle response, and reduce blow?by. The ring package is engineered to seal effectively at slightly larger clearances while coping with the high cylinder pressures typical of boosted four strokes. The engine feels more responsive off idle and more consistent across a wide operating range.
Engine builders should verify C classification with accurate bore measurements, set ring gaps carefully, and confirm piston to wall clearances. Inspect the supercharger, bearings, and gaskets, and ensure that cooling and lubrication systems are in top condition. With proper assembly and break in, the ProX C size SHO/FZR/FZS piston kit can provide many additional seasons of confident high output performance.
