Wiseco Crankshaft Assembly for 2001-2004 Yamaha YZ125 WPC125

A worn or damaged crankshaft directly compromises engine reliability and power delivery on your YZ125. This Wiseco assembly eliminates guesswork with factory-assembled, precision-trued components that meet OEM specifications out of the box. Whether you're rebuilding after a failure or refreshing a high-mileage motor, this complete kit delivers the durability and efficiency your 2-stroke demands.

The double-forged connecting rods provide the dimensional consistency and strength needed for sustained high RPM operation, while shot-peening removes internal stresses that typically lead to premature fatigue. Advanced surface treatments and case-hardened rod bores resist corrosion and wear, extending component life in demanding conditions. Precision oiling slots and double-drilled small ends ensure your connecting rod stays adequately lubricated and cooled—critical for 2-stroke reliability.

• Fits: 2001–2004 Yamaha YZ125
• Factory-assembled, precision-trued
• Double-forged connecting rods
• Shot-peened for durability
• Case-hardened rod bores
• Corrosion-resistant surface treatment
• Precision oiling slots
• Double-drilled small ends
• Includes top end bearing
• Premium main bearings included
• Complete bottom end gasket set
• All seals included
• Meets OEM specifications
• Bolt-on installation