The WISECO Crankshaft Kit is designed for select Yamaha YZ250 and YZ250X applications. The factory-assembled crankshaft is precision trued to OEM specifications and features a double-forged Wiseco connecting rod engineered for dimensional consistency through improved grain flow. The assembly includes main bearings and a bottom-end gasket kit.
Shot-peening helps eliminate residual stresses and smoothly blend the rod forging surfaces, while a corrosion-resistant surface treatment supports durability. Optimized crank pin bearing radial running clearance is designed to support 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 the piston pin with additional lubrication and cooling to help reduce top-end distortion caused by thermal transfer from the piston.
Distributor part number: WPC134. Manufacturer part number: WPC134. Fitment includes 2003, 2006, 2009, 2011, and 2015 Yamaha YZ250 models, plus 2017 Yamaha YZ250, and 2019, 2022, 2023, and 2025 Yamaha YZ250X models.
Features:
- Factory assembled and precision trued to OEM specifications
- Double-forged Wiseco connecting rod with improved grain flow for dimensional consistency
- Shot-peened rod forging surfaces help eliminate residual stresses
- Corrosion-resistant surface treatment
- Optimized crank pin bearing radial running clearance
- Precision-honed, ultra-round 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 select 2003, 2006, 2009, 2011, 2015, and 2017 Yamaha YZ250 models
- Fits select 2019, 2022, 2023, and 2025 Yamaha YZ250X models
Fitment:
2003 Yamaha YZ250
2004 Yamaha YZ250
2005 Yamaha YZ250
2006 Yamaha YZ250
2007 Yamaha YZ250
2008 Yamaha YZ250
2009 Yamaha YZ250
2010 Yamaha YZ250
2011 Yamaha YZ250
2012 Yamaha YZ250
2013 Yamaha YZ250
2014 Yamaha YZ250
2015 Yamaha YZ250
2016 Yamaha YZ250
2016 Yamaha YZ250X
2017 Yamaha YZ250
2017 Yamaha YZ250X
2018 Yamaha YZ250
2018 Yamaha YZ250X
2019 Yamaha YZ250
2019 Yamaha YZ250X
2020 Yamaha YZ250
2020 Yamaha YZ250X
2021 Yamaha YZ250
2021 Yamaha YZ250X
2022 Yamaha YZ250
2022 Yamaha YZ250X
2023 Yamaha YZ250
2023 Yamaha YZ250X
2024 Yamaha YZ250
2024 Yamaha YZ250X
2025 Yamaha YZ250
2025 Yamaha YZ250X