The Royal Enfield Genuine Jack Shaft (Part No. 570008) is a critical Original Equipment (OE) component of the electric start mechanism. This shaft acts as the primary transmission link between the starter motor and the engine’s sprag clutch assembly, facilitating the high-torque rotation required to fire up the engine.
Precision-machined from high-tensile hardened steel, this jack shaft is designed to withstand the sudden mechanical stress and immense rotational force generated during every start cycle. As a genuine factory spare, it ensures perfect alignment with the starter gears, preventing the grinding noises or “slipping” sensations common with worn or low-quality aftermarket shafts.
Key Features:
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100% Genuine Part: Authentic Royal Enfield replacement component as confirmed by the official factory packaging.
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High-Torque Durability: Forged from heavy-duty alloy steel to resist shearing and gear-tooth wear.
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Precision Surface Finish: Features a ground finish on bearing surfaces to reduce friction and heat buildup during operation.
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Factory Alignment: Engineered to the exact length and diameter required for the UCE (Unit Construction Engine) starter housing.
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Reliable Starting: Ensures smooth engagement of the starter motor, protecting the expensive sprag clutch from impact damage.
Technical Specifications:
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Brand: Royal Enfield Genuine
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Part Number: 570008
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Component: Jack Shaft (Starter Drive)
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Material: Hardened High-Carbon Steel
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Country of Origin: India
Motorcycle Compatibility
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Royal Enfield Classic 350 / 500 (Electric Start Models)
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Royal Enfield Bullet 350 ES / 500
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Royal Enfield Thunderbird 350 / 500 / X
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Royal Enfield Bullet Electra












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