The 570944 Piston Valve Kit is the official factory replacement for worn or damaged carburetor slides in Royal Enfield’s 350cc and 500cc UCE range. It includes the piston valve (slide) pre-attached to a high-quality rubber diaphragm.
This part ensures smooth vertical movement of the throttle slide in response to engine vacuum, providing consistent idling and stable power delivery across the RPM range. It is a direct replacement for older part numbers 570832 and 570832/A.
Key Features:
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OEM Authenticity: A 100% original Royal Enfield spare part, ensuring exact fitment and factory-grade performance.
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Optimal Throttle Response: Designed to eliminate “flat spots” in acceleration caused by torn or leaking diaphragms.
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High-Durability Diaphragm: Made from premium rubber to resist fuel degradation and temperature fluctuations.
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Stable Idling: Helps maintain precise air-fuel ratios for smoother engine operation at a standstill.
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Complete Assembly: Comes as a single unit with the piston valve and diaphragm integrated, simplifying the rebuild process.
Specifications:
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Part Number: 570944 (Supersedes 570832/A).
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Carburetor Type: BS29 CV Carburetor.
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Material: Aluminum Alloy (piston) and Rubber (diaphragm).
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Dimensions: Approximately 5.0 x 4.0 x 3.0 cm.
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Weight: ~0.25 kg.
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Vehicle Compatibility
This piston valve is specifically for carbureted UCE models (BS3 and BS4) and is NOT compatible with newer fuel-injected (EFI) or J-Series models.
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Classic Series: Classic 350 and Classic 500 (Carbureted models).
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Bullet Series: Bullet 350 UCE (KS/ES) and Bullet 500 UCE.
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Electra: Electra 350 UCE.
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Thunderbird: Thunderbird 350 and Thunderbird X 350.
Note: Does not fit Interceptor 650, Himalayan, Meteor 350, Hunter 350, or Classic 350 Reborn.









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