CRANKSHAFT BOTTOM KIT 1999-2000 YAMAHA YZ250 WISECO WPC126

Description

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

• Yamaha YZ250 1999–2000