The WISECO Crankshaft Kit, manufacturer part number WPC124, is designed for the 1998, 1999, and 2000 Yamaha YZ125. This kit includes a crankshaft assembly, main bearings, and a bottom-end gasket kit.
The crankshaft is factory assembled and precision trued to OEM specifications. Double-forged WISECO connecting rods are designed for dimensional consistency through improved grain flow, while shot-peening helps eliminate residual stresses and smoothly blend the rod forging surfaces. A corrosion-resistant surface treatment adds durability.
The crank pin bearing radial running clearance is optimized for performance, and precision honing provides an ultra-round bearing surface. Precision-engineered oiling slots help maximize rod strength and bearing life. Double-drilled small ends provide additional piston-pin lubrication and cooling, helping reduce top-end distortion caused by thermal transfer from the piston.
Distributor part number: 09210100. Vehicle fitment: 1998 Yamaha YZ125, 1999 Yamaha YZ125, and 2000 Yamaha YZ125.
Features:
- Factory assembled and precision trued to OEM specifications
- Double-forged WISECO connecting rod designed for dimensional consistency through improved grain flow
- Shot-peened connecting rod surfaces help eliminate residual stresses
- Corrosion-resistant surface treatment
- Optimized crank pin bearing radial running clearance
- Precision-honed bearing surface
- Engineered oiling slots help maximize rod strength and bearing life
- Double-drilled small ends provide additional piston-pin lubrication and cooling
- Kit includes crankshaft assembly, main bearings, and bottom-end gasket kit
- Fits 1998, 1999, and 2000 Yamaha YZ125
Fitment:
1998 Yamaha YZ125
1999 Yamaha YZ125
2000 Yamaha YZ125