CRANKSHAFT BOTTOM KIT 2003-2013 YAMAHA YZF250 WISECO WPC140
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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. The crankshaft kit includes a crankshaft assembly, main bearings, and a gasket set. Features include connecting rods that are double-forged to maintain superior dimensional consistency through improved grain flow, shot-peened to eliminate residual stresses and smoothly blend rod forging surfaces, and have a corrosion-resistant surface treatment. Top and bottom end rod bores are case-hardened to 58–62 RC to optimise bearing running surface. Crank pin bearing radial running clearance is optimised to ensure maximum performance, and 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 a dimpled design increase oil retention and reduce friction between the rod and washer interface. Crank pin bearings are manufactured with the highest-quality hot-rolled steel and case-hardened to 58–62 RC. Manufacturer: Wiseco.
- SKU
- 56-229.WI
- Brand
- Wiseco
- Availability
- In Stock (1)
Fitments (22)
| Make | Model | Year |
|---|---|---|
| YAMAHA | YZ 250F | 2003 |
| YAMAHA | YZ 250F | 2004 |
| YAMAHA | YZ 250F | 2005 |
| YAMAHA | YZ 250F | 2006 |
| YAMAHA | YZ 250F | 2007 |
| YAMAHA | YZ 250F | 2008 |
| YAMAHA | YZ 250F | 2009 |
| YAMAHA | YZ 250F | 2010 |
| YAMAHA | YZ 250F | 2011 |
| YAMAHA | YZ 250F | 2012 |
| YAMAHA | YZ 250F | 2013 |
| YAMAHA | YZF 250 | 2003 |
| YAMAHA | YZF 250 | 2004 |
| YAMAHA | YZF 250 | 2005 |
| YAMAHA | YZF 250 | 2006 |
| YAMAHA | YZF 250 | 2007 |
| YAMAHA | YZF 250 | 2008 |
| YAMAHA | YZF 250 | 2009 |
| YAMAHA | YZF 250 | 2010 |
| YAMAHA | YZF 250 | 2011 |
| YAMAHA | YZF 250 | 2012 |
| YAMAHA | YZF 250 | 2013 |
- General Product Group
- Crankshafts & Parts
- General Product Type
- Crankshaft Bottom End Kits
- Variant Id
- 250323
FULL DESCRIPTION
Wiseco Crankshaft Bottom Kit
This Wiseco crankshaft kit is designed for complete bottom-end service. It comes factory-assembled and includes main bearings and a gasket set for a comprehensive repair or rebuild. Precision-trued to OEM specifications, this kit incorporates advanced surface treatments and lubrication features engineered for durability and peak performance, especially under high-RPM conditions.
Key Features:
- Precision-trued and factory-assembled to meet OEM specifications.
- Double-forged connecting rods ensure superior dimensional consistency through optimized grain flow.
- Shot-peened surface treatment eliminates residual stresses and smoothly blends forging surfaces.
- Features a corrosion-resistant surface treatment for added longevity.
- Top and bottom end rod bores are case-hardened to 58–62 RC, optimizing the bearing running surface.
- Crank pin bearing radial running clearance is precisely controlled for maximum performance.
- Precision honing creates an ultra-round bearing surface.
- Engineered oiling slots enhance rod strength and extend bearing life.
- Double-drilled small ends provide extra lubrication and cooling to the piston pin, reducing thermal distortion.
- Silver-coated bronze phosphor thrust washers with a dimpled design improve oil retention and reduce friction.
- Crank pin bearings are constructed from high-quality hot-rolled steel and case-hardened to 58–62 RC.
Kit Components:
- Crankshaft assembly
- Main bearings
- Gasket set
QUESTIONS? JUST ASK
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Check the fitment table on this page against your make, model and year. Not sure? Call or email us and we will check it for you before you order.
Yes. We ship from the UK. Orders ship within 3 working days, then delivery to the United States takes 5–8 business days. The delivery price is shown at checkout before you pay. Delivery details
Yes. You have 14 days from delivery to return it, unused and in its original packaging. Contact us first and we will send you the return instructions. Returns policy
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