Naraku Heavy Duty 12mm Wrist Pin Bearing: 50cc 2T

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:

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