ProX Crankshaft Bearing and Seal Kit 23.CBS21093 — Yamaha YZ80 / YZ85 1993-2018

Product Description

The ProX Crankshaft Bearing and Seal Kit 23.CBS21093 is designed to be the definitive solution for your bottom-end rebuild. When performing a crankshaft replacement or service, it is critical to use fresh bearings and seals to maintain proper crank alignment and prevent air leaks that can compromise your 2-stroke engine's performance.

ProX components are manufactured to exact OEM specifications, ensuring that your engine meets factory standards for longevity and smooth operation. This comprehensive kit contains all the necessary bearings and seals for a professional-grade component replacement, making it the perfect partner for either your OEM crankshaft or a replacement ProX unit.

Top Features: ProX Crankshaft Bearing and Seal Kit

• Precision-engineered to meet or exceed exact OEM specifications
• Includes all essential bearings and seals for a complete bottom-end service
• Ensures optimal crankshaft alignment and reduces engine vibration
• Highly durable construction designed for the rigors of off-road racing
• Fully compatible with both OEM and ProX crankshaft assemblies

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: Why is it important to replace the seals along with the bearings?
A: On a 2-stroke engine, crankshaft seals are vital for maintaining crankcase compression and preventing transmission oil from being sucked into the combustion chamber. Old seals often become brittle and leak, which leads to erratic idling, poor throttle response, and potential lean engine seizure.

Q: Can I use this kit with a stock OEM crankshaft?
A: Yes, this kit is specifically designed to work perfectly with both OEM Yamaha crankshafts and ProX aftermarket replacement crankshafts.

Expert Pro-Tip: When pressing your new crankshaft bearings into the engine cases, always use an oven to warm the cases slightly (about 200°F). The aluminum cases will expand, allowing the new bearings to slip into place without needing to hammer them, which prevents case damage and ensures the bearings are seated perfectly square.

Recommended Pairings:
o Yamaha YZ85 Performance Parts & Upgrades
o Yamaha 2-Stroke Performance Parts
o Premium Engine Lubricants & Chemicals

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