Universal Parts Wrist Pin Bearing, 10mm 13.8mm Outer Dia.
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Smooth Rotation: Universal Parts 10mm Wrist Pin Bearing
Ensure the vital connection between your piston and connecting rod remains friction-free with the Universal Parts 10mm Wrist Pin Bearing. Engineered for 50cc 2-stroke engines, this small-end needle bearing is designed to withstand the rapid oscillating movements and high temperatures of the combustion chamber. Whether you are performing a top-end refresh or a full engine rebuild, this precision-ground bearing provides the stable support needed to prevent premature wrist pin wear and engine vibration.
Technical Performance Features
- Precision Needle Rollers: High-grade steel rollers provide maximum load-bearing capacity while maintaining a thin profile for tight engine tolerances.
- Friction-Reducing Design: Optimized cage architecture allows for maximum oil penetration, ensuring the bearing stays lubricated even at high RPMs.
- Durable Metal Construction: Manufactured to resist thermal expansion and shock-loading, essential for the longevity of small-displacement 2-stroke builds.
- Direct Fitment: Engineered as a standard replacement for 10mm wrist pin applications across various scooter and moped platforms.
Comprehensive Fitment Guide
This bearing is a standard fit for many 50cc 2-Stroke engines using a 10mm wrist pin:
| Engine Family | Typical Models |
|---|---|
| Minarelli / Yamaha Style | Jog, Zuma 50 (Pre-2002), BWS 50 |
| Chinese 2-Stroke (1PE40QMB) | Adly, Hammerhead, Keeway, Vento |
| General Size Match | Fits most 10mm ID / 13.7mm OD applications |
Technical Specifications
- Inner Diameter (ID): 10.4mm
- Outer Diameter (OD): 13.8mm
- Length: 12.6mm
- Material: Hardened Steel
Mechanic's Note: The wrist pin bearing is often the most overlooked part of a top-end rebuild. Safety Warning: A worn bearing can lead to wrist pin "slap" which eventually destroys both the piston and the rod. Pro Tip: Always soak your new bearing in 2-Stroke Oil for several minutes before installation to ensure it isn't "dry" during the critical first few seconds of engine startup!
SKU: 105-29
Vendor: Universal Parts
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Please verify fitment and part number before ordering. Contact Thrifty Scooters promptly if an item arrives damaged or incorrect.