Solve starter kick-back, grinding or free-spinning starts the OEM way with the genuine Royal Enfield Sprag (one-way) Clutch — Part No. 147787/C. The official RE parts assignment lists 147787/C as SPRAG CLUTCH, with 147787/B shown as the prior code now superseded. This unit is the factory one-way clutch that engages the starter gear to the crank on UCE single-cylinder, electric-start models. Being OEM, the cage, ramps and rollers are hardened to the correct spec and sized for the UCE flywheel bore—no tolerance stack-ups that can shred hubs or backfire under load. Installation is bolt-on with the OE drive cover stack; use fresh rotor/flywheel and cover gaskets where your fiche specifies.

Fitment is verified across UCE ES platforms by trusted dealer catalogs (Classic/Bullet/Electra/Thunderbird 350–500 UCE, plus Continental GT 535 EFI). Hitchcocks also note the improved sprag fitted from Aug-2010 onward and backwards-compatible as a complete assembly for early UCE/EFI bikes—exactly the use-case this part serves. We list only confirmed models below to keep returns at zero. 

Key Features

• OE identity: 147787/C – “SPRAG CLUTCH” . 

• Built to RE spec for UCE ES engines → correct ramp angles & hardness for reliable starts.

• Backward-compatible improved design (Aug-2010 on) when replacing early units. 

• Direct bolt-in with OE drive cover/flywheel stack; no machining or shims needed.

• Reduces backfire-induced sprag failures common on worn aftermarket copies.

• Use on Classic/Bullet/Electra/Thunderbird 350–500 UCE and CGT 535 EFI. 

Compatibility Table (confirmed only)

Notes: Improved sprag from Aug-2010; for earlier UCE/EFI bikes, fit the complete later assembly. Always confirm on your VIN-specific fiche. 

Variants

• 147787/C — Sprag Clutch (current supply) (this listing)

• 147787/B — Sprag Clutch (superseded → use 147787/C). 

FAQs

Q1. Will 147787/C fit my UCE Classic 350 BS4 with electric start?
Yes—this sprag is listed for Classic 350 UCE (ES) and other UCE ES models. Always match to your VIN fiche. 

Q2. What changed after Aug-2010?
RE adopted an improved sprag assembly that can be fitted to earlier UCE/EFI bikes to curb backfire-related failures. 

Q3. Symptoms of a failing sprag?
Starter spins without cranking, harsh back-kick, grinding on start, metal shards in the drive cover.

Q4. Do I need other parts?
Inspect starter idler gears, hub, flywheel bore and cover/flywheel gaskets; replace any damaged items per fiche.

Q5. Does this fit J-Series (new Classic 350/J1A) or Twins?
No—this PN is for UCE singles. J-Series and 650 Twins use different designs; order by their specific PNs.