1999 - 2000 YAMAHA YZ 250

Crankshaft kit with bearing and gasket | Wiseco

Product description

Include crankshaft, top end bearing, premium main bearings and a complete bottom end gasket set that includes all seals and gaskets needed to do the job Only one part number to stock and order Crankshafts are factory assembled and precision trued to OEM specifications Double-forged Wiseco connecting rods maintain superior dimensional consistency through improved grain flow Shot-peening eliminates residual stresses and smoothly blends the rod forging surfaces Corrosion-resistant surface treatment Top and bottom end rod bores case hardened to 58-62 RC to optimize bearing running surface Crank pin bearing radial running clearance is optimized to ensure maximum performance Precision honing ensures ultra round bearing surface Precision engineered oiling slots maximize rod strength and bearing life Double-drilled small ends provide the piston pin with extra lubrication and cooling, reducing distortion of top end due to thermal transfer from the piston Silver-coated bronze phosphor thrust washers, with dimpled design to increase oil retention and reduce friction between rod and washer interface Crank pin bearings are manufactured from the highest quality hot rolled steel; case-hardened to 58-62 RC Caged needle roller bearings provide the highest possible rpm Precision machined crank webs