CRANKSHAFT BOTTOM KIT 1999-2000 YAMAHA YZ250 WISECO WPC126
4.1 Trustpilot 99.9% positive on eBay
Delivery to United States 5–8 business days
Spread the cost with 
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 include 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, and high-quality crank pin bearings. 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.
- SKU
- 56-180.WI
- Brand
- Wiseco
- Availability
- In Stock (2)
Fitments (2)
| Make | Model | Year |
|---|---|---|
| YAMAHA | YZ 250 | 1999 |
| YAMAHA | YZ 250 | 2000 |
- General Product Group
- Crankshafts & Parts
- General Product Type
- Crankshaft Bottom End Kits
- Variant Id
- 250172
FULL DESCRIPTION
Wiseco Crankshaft Bottom End Kit for Two-Stroke Engines
Restore your engine's heart with this complete crankshaft bottom end kit from Wiseco. Engineered for high-performance two-stroke applications, this kit provides a comprehensive solution for a thorough bottom-end service. It includes a factory-assembled crankshaft, precision-trued to OEM specifications, along with essential main bearings and a full gasket set to ensure a perfect seal and reliable operation.
Wiseco's commitment to quality is evident in every component. The double-forged connecting rod offers superior dimensional consistency and optimized grain flow for maximum strength. Shot-peening the rod surfaces helps to relieve residual stresses, enhancing durability. Critical components feature a corrosion-resistant surface treatment to protect against wear and environmental factors.
The big- and small-end rod bores are case-hardened to 58–62 RC, creating optimal bearing surfaces for longevity. Experience smoother operation and extended bearing life thanks to engineered oiling slots that maximize lubrication. The small end is also double-drilled to ensure improved piston pin lubrication and cooling, a crucial detail for high-revving engines.
Further enhancing performance and reliability are the silver-coated phosphor bronze thrust washers. Their dimpled faces are designed for exceptional oil retention and reduced friction, contributing to overall engine efficiency. High-quality crank pin bearings complete this robust assembly, providing smooth rotation and load-bearing capability.
Key Features:
- Precision-trued crankshaft assembly to OEM specifications
- Factory-assembled for convenience and accuracy
- Double-forged connecting rod for enhanced strength and consistency
- Shot-peened rod surfaces for stress relief
- Corrosion-resistant surface treatment on critical parts
- Case-hardened rod bores (58–62 RC) for superior bearing surfaces
- Optimized crank pin bearing radial running clearance
- Precision-honed bearing surfaces for perfect geometry
- Engineered oiling slots for increased 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
- Includes high-quality crank pin bearings
- Complete gasket set included for comprehensive service
Kit Contents:
- Assembled crankshaft
- Main bearings
- Complete gasket set
Specifications:
- Assembly Type: Bottom-end crankshaft kit
- Engine Type: Two-stroke single
- Manufacturer: Wiseco
- Manufacturer Reference: WPC126
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.
Trade pricing available
Buying parts for your business? Apply for a 2BrosParts trade account.