Description
A crankshaft is the backbone of any high-performance engine rebuild, and the Wiseco WPC139 is engineered for the demands of serious YZ450F riders. This complete bottom-end kit arrives factory-assembled and precision-trued to OEM specifications, eliminating guesswork and ensuring your engine delivers consistent power and reliability from the first start. Whether you’re rebuilding after a season of aggressive riding or upgrading to maximize performance, this kit delivers the durability and precision you need to stay competitive.
- Fits: 2003–2005 Yamaha YZ450F
- Complete kit included: crankshaft, top-end bearing, main bearings, bottom-end gasket set
- Double-forged connecting rods
- Shot-peened surfaces
- Caged needle roller bearings
- High-RPM rated design
- Precision oiling slots
- Double-drilled small ends
- Factory-assembled and trued
- OEM-specification tolerances
- Enhanced lubrication and cooling
- Installation: Professional fabrication recommended
