The Royal Enfield 573929/A Cover Starter Motor is a genuine OEM component used to cover and protect the starter motor assembly on compatible Royal Enfield 500cc motorcycles.
Royal Enfield parts catalogue data identifies 573929/A as “COVER STARTER MOTOR – NT 51.” The Thunderbird 500 parts catalogue specifically lists 573929/A – Cover Starter Motor (500cc) Black in the crankcase RH cover-side assembly.
The catalogue also shows 573929/B as the replacement reference for 573929/A. Therefore, customers looking for the original 573929/A should verify whether their application now requires the updated 573929/B part number.
Key Features
- Genuine Royal Enfield OEM spare part
- Part Number: 573929/A
- Description: Cover Starter Motor – NT51
- Designed for compatible 500cc applications
- Used to protect and cover the starter motor assembly
- Original-style OEM mounting
- Black finish as listed in the Thunderbird 500 catalogue
- Suitable for replacement and restoration
- 573929/B listed as replacement reference
Compatibility
- Royal Enfield Thunderbird 500
- Royal Enfield Thunderbird 500 UCE
- Compatible 500cc NT51 applications where 573929/A is specified
The Thunderbird 500 parts catalogue specifically lists 573929/A as the 500cc black starter motor cover.
Important: Royal Enfield catalogue data shows 573929/B as the replacement for 573929/A. Match the existing part number and mounting configuration before ordering.
Application
Starter Motor / Crankcase RH Cover / Engine Protection
Package Contents
- 1 × Royal Enfield 573929/A Cover Starter Motor









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