Product Description
The 147097/B RR Unit is a critical electrical component that performs two vital functions: it Rectifies the alternating current (AC) produced by the stator into direct current (DC) for the battery and Regulates that voltage to prevent overcharging.
Specifically calibrated for Single Phase alternator systems found on older Self-Start (ES) models, this unit is built with a heavy-duty aluminum heat sink to dissipate the high temperatures generated during long rides. Using the correct “Single Phase” unit is essential; using a 3-Phase unit on a Single Phase stator will lead to charging failure and potential battery damage. This genuine part ensures your electric start always has enough “juice” to fire up the engine without delay.
Key Features:
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Genuine OEM Reliability: 100% original Royal Enfield spare (PN: 147097/B), superseding older part numbers like 502045/B.
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Optimized for Self-Start: Designed to handle the higher electrical draw and charging requirements of Electric Start (ES) models.
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Advanced Heat Dissipation: Die-cast aluminum fins provide superior cooling, extending the life of the internal electronics.
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Precise Voltage Control: Maintains a steady charging output (typically ~14.2V–14.5V) to protect your battery and CDI/TCI unit.
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Vibration Resistant: Potted/sealed internal circuitry prevents failure from the engine’s characteristic low-frequency vibrations.
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Correct Pin Layout: Features the factory-spec connectors for a secure, “plug-and-play” installation.
Technical Specifications:
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Part Number: 147097/B (also referenced as 147097B)
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Phase Type: Single Phase
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Component Type: Regulator Rectifier (RR Unit)
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Material: Die-Cast Aluminum & High-Grade Electronics
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Quantity: 1 Number
Vehicle Compatibility:
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Royal Enfield Bullet 350 UCE (Self-Start / ES Models)
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Royal Enfield Electra 5S (TCI Models)
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Royal Enfield Thunderbird 350 (TCI/CDI early models)
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Royal Enfield Classic 350/500cc
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Note: This is a Single Phase unit. Please verify your bike uses a 2-wire (Single Phase) or 3-wire (3-Phase) stator before purchase. BS6 and later models typically use a 3-Phase system.












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