Comprehensive piston and valvetrain conversion kit engineered to increase durability and maintain performance under high valve lift. The kit replaces stock titanium valves with stainless steel components and pairs them with matched springs and retainers, alongside a forged piston designed for precise valve relief geometry and reliable top-end sealing.

Features

• Stainless steel valve conversion for increased service life over stock titanium valves


• Dual spring and titanium retainer set to control high-lift operation


• Intake and exhaust valve lift capability of 0.395 in and 0.370 in respectively


• Piston with convex valve reliefs matching valve dish geometry to maximise compression


• Top-end gasket set included for correct resealing


• Supplied with piston rings, wrist pin and clips

Specifications

• Valve lift capability: 0.395 in (intake), 0.370 in (exhaust)


• Valve type: Stainless steel (stock head diameter)


• Retainers: Titanium


• Kit contents: Piston; rings; wrist pin; clips; top-end gasket kit; stainless valves (stock head dia.); dual valve springs; titanium retainers


• Intended use: High-lift stainless conversion for four-stroke singles

Cross-Reference OEM Part Numbers

• 56-PS001


• Kibblewhite 80-81200

Vehicle Fitments

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  Yamaha YZ250F 2014–2016