Yamaha off-road motorcycle // sport atv gytr valve spring kit
Engine / performance
Springs are a dual-rate progressive design that are made
of fatigue-resistant chrome silicon. Designed for high performance
camshafts. Intake spring force increased by 56%
over stock at maximum lift of 8.8mm. Exhaust spring force
increased by 25% over stock at maximum lift of 8.5mm. Fits ’05-’13 YZ250F/ WR250F.Intake Springs:
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:
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, 2010/2011 YZ250F spring retainers are required.
Yamaha off-road motorcycle // sport atv gytr valve spring kit
Yamaha off-road motorcycle // sport atv gytr valve spring kit
