Wiseco Crankshaft Assembly with Bearing and Gasket for Yamaha YZ125 1998-2000 WPC124

If you're rebuilding a YZ125 two-stroke or pushing your engine to its limits, a worn or damaged crankshaft will quickly become your bottleneck. The Wiseco WPC124 eliminates guesswork with a factory-assembled, precision-trued crankshaft paired with everything you need for a complete bottom-end refresh—main bearings, top-end bearing, and gasket set included. This is the kind of comprehensive kit that separates a proper rebuild from a rushed one.

Wiseco's double-forged connecting rods and shot-peening process reduce internal stress concentrations, translating to better durability under the high RPM demands of a competition 125. The case-hardened rod bores and corrosion-resistant surface treatment ensure longevity in harsh riding conditions, while precision-honed bearing surfaces with engineered oiling slots maximize film strength and bearing life. You get the reliability of OEM-spec fitment with the strength engineering that serious racers expect.

• Fits: Yamaha YZ125 (1998–2000)
• MPN: WPC124
• Double-forged connecting rods
• Factory-assembled, precision-trued
• Caged needle roller bearings
• Shot-peened for durability
• Case-hardened rod bores
• Corrosion-resistant surface treatment
• Includes main bearings
• Includes top-end bearing
• Includes gasket set
• Engineered oiling slots
• Bolt-on installation ready