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CRANKSHAFT BOTTOM KIT 2003-2013 YAMAHA YZF250 WISECO WPC140

Original price was: $460.20.Current price is: $357.90.

49 in stock

SKU: 56-229.WI Category:

Description

A factory-assembled crankshaft kit supplied with main bearings and a gasket set for complete bottom-end service. Precision-trued to OEM specifications, it incorporates advanced surface treatments, lubrication features and tightly controlled clearances to support durability and performance under high-RPM operation.

Features

  • Precision-trued to OEM specifications and factory assembled
  • Connecting rods are double-forged to maintain superior dimensional consistency through improved grain flow
  • Shot-peened to eliminate residual stresses and smoothly blend rod forging surfaces
  • Corrosion-resistant surface treatment
  • Top and bottom end rod bores case-hardened to 58–62 RC to optimise bearing running surface
  • Crank pin bearing radial running clearance optimised to ensure maximum performance
  • Precision honing ensures an ultra-round bearing surface
  • Precision-engineered oiling slots maximise rod strength and bearing life
  • Double-drilled small ends provide the piston pin with extra lubrication and cooling, reducing distortion of the 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 manufactured with the highest-quality hot-rolled steel — case-hardened to 58–62 RC

Specifications

  • Manufacturer: Wiseco
  • Product type: Crankshaft kit with bearings and gaskets
  • Included components: Crankshaft assembly, main bearings, gasket set

Cross-Reference OEM Part Numbers

  • WPC140
  • 56-229.WI

Vehicle Fitments

  • Yamaha YZ250F (2003–2013)