Yamaha

17D-E21J0-V0-00

Yamaha 17D-E21J0-V0-00 GYTR Valve Spring Kit for Yamaha YZ250F

Body & Frame Parts

Fits '05-'11 YZ250F/WR250F

Springs are a dual rate progressive design that is made of fatigue resistant chrome silicon. Designed for high performance camshafts. Intake spring force increased by 56 percent over stock at maximum lift of 8.8mm. Exhaust spring force increased by 25 percent over stock at maximum lift of 8.5mm. Intake springs has Installed height: 29.4mm, spring force: 120 N (27 lb.), spring height at max lift of 8.8mm: 20.6mm, spring force: 325 N (73 lb.). Exhaust springs has Installed spring height: 28.65mm, spring force: 131 N (29.5 lb.), spring height at max lift of 8.5mm: 20.15mm, spring force: 341 N (77 lb.). Note: If using this valve spring kit on '05-'09 YZ250F/WR250F models and 2010/2011 YZ250F, spring retainers are required.

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