The Top Gear Nut (Old Model) is a critical internal component for the gearbox of vintage Royal Enfield motorcycles, specifically those equipped with the traditional 4-speed right-shift cast-iron engine. This nut is used to secure the top gear (sleeve gear) onto the gearbox main shaft.
Key Features
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Precision Engineering: Designed to withstand the high torque and rotational forces of the gearbox’s final drive assembly.
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Material: Typically manufactured from hardened alloy steel or durable brass to ensure long-lasting reliability and prevent thread stripping.
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Finish: Often comes in a polished chrome or natural brass finish, providing both corrosion resistance and an improved aesthetic for the gearbox casing.
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Authentic Fit: Specifically sized for old-model 350cc and 500cc cast-iron engines, ensuring a perfect match with the original threaded shafts.
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Critical Safety Component: Restoring or replacing a worn nut is vital to prevent main shaft play, which can lead to oil leaks or significant gear transmission failure.
Technical Specifications
| Feature | Details |
| Compatibility | Bullet 350/500, Standard, Machismo, Electra (Old 4-Speed Models) |
| Reference Part No. | #550131/A or similar depending on the specific nut kit |
| Material Options | Alloy Steel, Brass, or Stainless Steel |
| Function | Secures the sleeve gear/main shaft within the gearbox casing |
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