CLEARANCE - CJR Stroker Crankshaft - CRF110 Size:+4mm Yamaha WR250F 17-18

Yamaha WR250F 17-18

it is worth considering upgrading the rear sprocket from the stock 48T to a new 58T sprocket and chain

and Gorilla Takegawa Special Die Cast Clutch Covers when paired with an external oil cooler

TBW0859 - V2 head gasket kit

2019-Current CRF110F

CLEARANCE - CJR Stroker Crankshaft - CRF110 Size:+4mm Yamaha WR250F 17-18Stroker Crankshaft CRF110 IMPORTANT NOTE THESE AFTERMARKET CRANKSHAFTS WILL REQUIRE USING A MANUAL LOCKOUT DUE TO THE DESIGN OF THE ONE WAY CLUTCH. The stock one way clutch during engagement and dis engagement causes an excessive amount of stress on furthest part of the crankshaft and can over time create a weak point which in turn may see a failure with aggressive riding. +4mm Stroker Crankshaft Increases big bore 55mm 132cc displacement to 142cc.