Complete crankshaft assembly kit supplied with main bearings and a full gasket set for comprehensive bottom-end service. Factory-assembled and precision-trued to OEM specifications, with engineered oiling features and surface treatments to support durability and reliable operation in high-demand two-stroke use.

Features

• Precision-trued to OEM specifications


• Factory-assembled crankshaft


• Double-forged connecting rod for dimensional consistency and grain flow


• Shot-peened rod surfaces to relieve residual stresses


• Corrosion-resistant surface treatment on critical components


• Case-hardened big- and small-end rod bores to 58–62 RC for optimal bearing surfaces


• Optimised crank pin bearing radial running clearance


• Precision-honed bearing surfaces for ultra-round geometry


• Engineered oiling slots to maximise rod strength and bearing life


• Double-drilled small end for improved piston pin lubrication and cooling


• Silver-coated phosphor bronze thrust washers with dimpled faces for oil retention and reduced friction


• High-quality crank pin bearings

Specifications

• Kit contents: Assembled crankshaft, main bearings, complete gasket set


• Assembly type: Bottom-end crankshaft kit


• Engine type: Two-stroke single


• Manufacturer: Wiseco


• Manufacturer reference: WPC126

Cross-Reference OEM Part Numbers

• 56-180.WI


• WPC126

Vehicle Fitments

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  Yamaha YZ250 1999–2000