Wiseco Crankshaft Kit WPC123 — Yamaha YZ85 2002-2018

Wiseco Crankshaft Kit WPC123 — Yamaha YZ85 2002-2018

Product Description

The Wiseco Bottom End Crankshaft Kit WPC123 is the ultimate all-in-one solution for a complete engine overhaul on your Yamaha YZ85. Factory-assembled and precision-trued to exact OEM specifications, this kit takes the guesswork out of your rebuild. By combining the crankshaft assembly with high-quality main bearings and a complete bottom-end gasket set, Wiseco provides everything you need to restore your engine's reliability and performance with total confidence.

Every component is engineered for durability, featuring Wiseco's double-forged connecting rods that offer superior dimensional consistency. The crankshaft undergoes a specialized shot-peening process to eliminate residual stresses, while precision honing ensures an ultra-round surface for maximum bearing life. With performance-focused details like precision oiling slots and double-drilled small ends, this kit is designed to handle the intense thermal demands of competitive motocross racing.

Top Features: Wiseco Crankshaft Kit

• Factory assembled and precision-trued to exceed OEM specifications.
• Double-forged connecting rods for enhanced grain flow and strength.
• Shot-peened surface treatment eliminates stress and improves fatigue resistance.
• Optimized radial clearance for maximum performance and longevity.
• Includes crankshaft assembly, main bearings, and full bottom-end gasket set.

Please review the detailed compatibility data below to ensure an exact fitment match for your motorcycle before finalizing your purchase.

Fitment List

Frequently Asked Questions

Q: Does this kit include everything needed to rebuild the bottom end?
A: Yes, this kit is comprehensive and includes the crankshaft assembly, main bearings, and the complete bottom-end gasket set required for the job.

Q: Why are the small ends double-drilled?
A: The double-drilled small ends provide additional lubrication and cooling to the piston pin, which helps reduce thermal distortion and improves top-end durability under heavy loads.

Expert Pro-Tip: When installing your new crankshaft, always ensure your engine cases are perfectly clean and free of debris. Use a high-quality assembly lube on the bearings during installation and double-check your crank end-play according to the Yamaha service manual to ensure the engine spins freely before buttoning it up.

Recommended Pairings:
o Yamaha YZ85 Performance Parts & Upgrades
o Essential Engine Rebuild Tools
o Premium Engine Assembly Lubricants

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