Naraku Heavy Duty 12mm Wrist Pin Bearing: 50cc 2T
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High-RPM Reliability: Naraku Heavy Duty Small End Bearing
Ensure the heart of your engine remains stable with the Naraku Heavy Duty Wrist Pin Bearing. Engineered for 50cc 2-stroke engines, this "small end" needle bearing features a reinforced silver-plated cage designed to withstand the extreme thermal stress and high rotational speeds of performance tuning. Whether you are performing a routine top-end refresh or installing a high-compression cylinder kit, this bearing provides the precision fit and reduced friction necessary to prevent catastrophic engine failure.
Technical Performance Features
- Heavy Duty Silver Cage: Specifically designed for superior heat dissipation and reduced friction compared to standard steel-caged bearings.
- Precision Needle Rollers: Features high-grade hardened steel rollers for maximum load-bearing capacity and smooth piston articulation.
- Optimized for Performance: The ideal choice for "Sport" and "Mid-Race" 70cc kits where crankshaft RPM exceeds factory limits.
- OEM-Spec Dimensions: A direct 12x17x13mm replacement for a wide range of European and Japanese 2-stroke scooters.
Comprehensive Fitment Guide
This bearing fits a massive variety of 50cc 2-Stroke models using a 12mm wrist pin:
| Brand | Compatible Models |
|---|---|
| Vespa / Piaggio | ET2, LX/LXV, Primavera, Sprint 50, Fly 50, Typhoon 50 |
| Honda | Dio, Elite 50 (1994+ / AF27/AF28/AF34/AF35) |
| Aprilia | SR 50, Mojito, Scarabeo, Sport City One 50 |
| Kymco / SYM | Super 9, Agility, Like 50, DD 50, Fiddle I, Jet 50 |
| Vintage Vespa | PK 50, V 50 |
Technical Specifications
- Inner Diameter: 12mm
- Outer Diameter: 17mm
- Length: 13mm
- Cage Type: Silver-Plated Heavy Duty
Mechanic's Note: The wrist pin bearing is the most stressed bearing in a 2-stroke engine.
Safety Warning: Never reuse an old wrist pin bearing during a top-end rebuild.
Pro Tip: When installing, liberally coat the bearing in high-quality 2-Stroke Racing Oil to ensure immediate lubrication upon the first start-up. Check your Piston Circlips for tension while you're in there!
SKU: 137-73
Vendor: Naraku
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Returns & warranty
Please verify fitment and part number before ordering. Contact Thrifty Scooters promptly if an item arrives damaged or incorrect.