Royal Enfield Starter Relay (Relay Starter) 591561/B – Classic 350 / Electra 350 UCE (ES) / Classic 500 EFI / Bullet 500 EFI

If your Royal Enfield occasionally “clicks” but doesn’t crank, struggles to start when hot, or the starter motor works only sometimes, the Starter Relay / Relay Starter 591561/B is one of the first OEM electrical components to inspect and replace. This relay acts as the high-current switch between the battery and starter motor, ensuring reliable cranking without overheating your starter switch or wiring.

This is a Genuine Royal Enfield relay (replacement/updated part number 147955/E) designed for specific UCE-era models that use this relay in the stock electrical architecture. OEM fitment matters here—aftermarket relays often cause intermittent starting, premature contact wear, or inconsistent engagement under load.

Best practice: replace a weak relay before it damages the starter circuit, especially if you ride in traffic, do frequent short trips, or run additional electrical accessories. Install is straightforward for a mechanic, but always verify your bike’s existing relay code/connector before ordering.

Not for J-Series (Classic Reborn/Meteor/Hunter/Bullet J) or 650 Twins unless your microfiche matches this part number.

Key Features 

• Genuine Royal Enfield Starter Relay (Relay Starter)

• Part No: 591561/B (Replacement: 147955/E)

• Helps fix no-crank / single-click / intermittent self-start symptoms

• OEM-grade internal contacts for stable high-current switching

• Direct-fit for confirmed UCE/EFI applications (see table)

• Recommended replacement when relay heats up, clicks repeatedly, or cranks weakly

• Ideal during battery/starter wiring service to prevent future breakdowns

• Supplied as 1 unit (relay only)

Compatibility Table 

PLEASE CHECK PART NUMBER BEFORE PURCHASE

Variants

• Single unit only (Relay Starter / Starter Relay)

FAQs 

1. What are the symptoms of a bad starter relay?
   Single click with no crank, intermittent self-start, weak cranking despite good battery, relay heating up, or repeated rapid clicking.

2. Is 591561/B the latest part number?
   Royal Enfield lists 147955/E as the replacement part number for 591561/B. 

3. Will this fit Classic Reborn / Meteor / Hunter (J-Series)?
   No—not unless your bike’s microfiche shows 591561/B (or 147955/E). J-Series uses a different electrical parts mapping.

4. Do I need a mechanic for installation?
   A mechanic is recommended. Incorrect wiring can blow fuses or damage the starter circuit. Match the connector and mounting position with your existing relay.

5. Should I replace anything else with it?
   If starting issues persist, check battery health, starter motor terminals, ground cable, and main fuse box for heat marks/corrosion.