CRANKSHAFT BOTTOM KIT 03-05 YZF450, WISECO WPC139 YAMAHA MX
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Wiseco Crankshaft Bottom End Kit with Bearings and Gaskets - WPC139. Precision-trued to OEM specifications and factory assembled. Connecting rods are double-forged for superior dimensional consistency through improved grain flow. Shot-peening eliminates residual stresses and smoothly blends rod forging surfaces. Features corrosion-resistant surface treatment. Top and bottom end rod bores are case hardened to 58-62 RC to optimize bearing running surface. Crank pin bearing radial running clearance is optimized for maximum performance. Precision honing ensures an 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 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 the rod and washer interface.
- SKU
- 56-230.WI.CBK
- Brand
- Wiseco
- Availability
- In Stock (1)
Fitments (8)
| Make | Model | Year |
|---|---|---|
| YAMAHA | WR 450F | 2003 |
| YAMAHA | WRF 450 | 2003 |
| YAMAHA | YZ 450F | 2003 |
| YAMAHA | YZ 450F | 2004 |
| YAMAHA | YZ 450F | 2005 |
| YAMAHA | YZF 450 | 2003 |
| YAMAHA | YZF 450 | 2004 |
| YAMAHA | YZF 450 | 2005 |
- General Product Group
- Crankshafts & Parts
- General Product Type
- Crankshaft Bottom End Kits
- Variant Id
- 250327
FULL DESCRIPTION
Wiseco Crankshaft Bottom End Kit
Enhance the performance and durability of your motorcycle's engine with this Wiseco Crankshaft Bottom End Kit.
This comprehensive kit includes:
- Precision-trued crankshaft
- High-quality bearings
- Durable gaskets
Key Features:
- Double-Forged Connecting Rods: Engineered for superior dimensional consistency and improved grain flow.
- Shot-Peened Finish: Eliminates residual stresses and smoothly blends forging surfaces for increased strength.
- Corrosion-Resistant Surface Treatment: Provides long-lasting protection against the elements.
- Case-Hardened Rod Bores: Optimized for bearing running surfaces, ensuring maximum performance and longevity.
- Optimized Crank Pin Bearing Clearance: Guarantees peak performance.
- Precision Honing: Ensures an ultra-round and precise bearing surface.
- Engineered Oiling Slots: Maximize rod strength and bearing life for reliable operation.
- Double-Drilled Small Ends: Provide enhanced lubrication and cooling to the piston pin, reducing thermal distortion.
- Silver-Coated Bronze Phosphor Thrust Washers: Feature a dimpled design to increase oil retention and reduce friction.
QUESTIONS? JUST ASK
Talk to John or Phil. Real people, Monday to Friday, 10:00 to 17:00 (UK time).
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
By card, PayPal, Apple Pay or Google Pay, or spread the cost with Klarna. Payment is taken securely by Stripe, and the options for your order are shown at checkout.
Any customs duties or import taxes charged in the United States are paid by you when the parcel arrives. Any tax we collect ourselves is shown at checkout before you pay.
More answers in our FAQ.
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