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SPRING, RETAINERS, SHIMS KIT KIBBLEWHITE 80-80066 RACING WRF250 01-12, YZF250 01-12

Availability: In stock

SKU: TL1263380

Part number: 65-721.FK

£219.44

Qty:

Part No. 65-721 (Off Road Only Ltd.) HIGH LIFT 0.380 INC. YAMAHA YZF/WRF 250 01-12, Lightweight Racing Valve Chrome Silicon Springs, Titanium Retainers, H.T. Steel lower Collars, SEALES. Kibblewhite # 80-80066 Description Intake - 0.380 Valve Lift OK 40# Seat Pressure / 86 lb. at .380 lift Exhaust - 0.380 Valve Lift OK 40# Seat Pressure / 86 lb. at .380 lift KPMI takes a scientific -System- approach when designing our Valve spring kits. Each component is designed to work with the others as part of the complete system. KPMI?s engineers use our proprietary design and simulation softwares, and draw on our 70+ years of design experience to create these systems. Our design, simulation, and manufacturing processes insure compatibility of the valve spring?s force and natural frequency with the cam profile, valvetrain mass, system harmonics, and the engine RPM. Our spring manufacturing partners are U.S based companies that are ISO certified. The Super-Clean Chrome Silicon valve spring wire we use is traceable back to Kobe Japan where some of the best spring wire in the world is manufactured. Combining our design and simulation protocols with this premium quality valve spring wire, and manufacturing processes including, heat treatment, stress relief, and shot peening, allow us to supply you with the best valve springs in the world.