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Crankshaft/ Bottom End Rebuild Kit - Wiseco WPC140

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$314.95
YearMakeModelSubmodel
2012YamahaYZ250F--
2012YamahaYZ250FTeam Yamaha
2011YamahaYZ250F--
2011YamahaYZ250FTeam Yamaha
2010YamahaYZ250F--
2009YamahaYZ250F--
2008YamahaYZ250F--
2007YamahaYZ250F--
2006YamahaYZ250F--
2006YamahaYZ250F50th Anniversary
2005YamahaYZ250F--
2004YamahaYZ250F--
2003YamahaYZ250F--
Precision-trued to OEM specifications and factory assembled
Connecting rods are double-forged to 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 increase oil retention and reduce friction between rod and washer interface
Crank pin bearings are manufactured with 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
Crankshaft comes with top-end bearing, premium main bearings and a complete bottom end gasket set that includes all seals and gaskets needed to do the job