Product Description
Restore effortless starting and protect your starter motor with the Genuine Royal Enfield Auto Decompressor Flyweight. This specialized OEM component (Part No: 570541/B) is a critical part of the automatic decompression mechanism located on the exhaust camshaft of Unit Construction Engines (UCE).
Constructed from high-durability sintered metal, this flyweight uses centrifugal force to manage engine compression during the start-up phase. At low cranking speeds, the flyweight engages a pin that slightly lifts the exhaust valve, reducing the pressure the starter motor must overcome to turn the engine over. Once the engine fires and reaches a specific RPM, centrifugal force swings the flyweight outward, disengaging the mechanism and allowing the engine to run at full compression. The “B” revision indicates an optimized sintering process for better wear resistance against the cam lift pin, preventing the common “clacking” sound or “hard start” issues associated with worn decompressor units.
Key Features:
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Start-Up Optimization: Enables the automatic decompression required for smooth electric and kick-starting on high-torque singles.
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High-Strength Sintering: Manufactured using advanced powder metallurgy for superior hardness and heat resistance within the rocker casing.
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Starter Motor Protection: By reducing initial cranking resistance, it significantly extends the life of your battery and sprag clutch.
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Direct OEM Replacement: Guaranteed factory fitment, ensuring the timing of the decompression stroke remains within original specifications.
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Precision Balance: Dynamically balanced to ensure it does not introduce unwanted vibration at high engine speeds.
Product Specifications:
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Brand: Royal Enfield Genuine Parts
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Part Number: 570541/B (Supersedes 570541/A)
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Material: Sintered High-Tensile Steel
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Location: Mounted on Exhaust Camshaft Assembly
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Quantity: 1 Piece per assembly
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Compatibility:
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✅ Royal Enfield Classic 350 / 500 (All UCE Models)
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✅ Royal Enfield Bullet 350 / 500 (UCE Models – Standard, ES, Electra)
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✅ Royal Enfield Thunderbird 350 / 500 / 350X / 500X
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✅ Royal Enfield Continental GT 535
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❌ Note: Not compatible with the J-Series (Reborn/Meteor/Hunter/New Bullet) or 650 Twins.
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