Royal Enfield Oil Seal Adaptor (Behind Clutch) | Bullet/Electra/Lightning (Retired Models) | 111888/A | Genuine OEM

Oil leaks from the clutch/primary side on retired Royal Enfield engines are often traced to tired sealing components—and the adaptor plate is a key part of that sealing stack. The Royal Enfield 111888/A Oil Seal Adaptor is listed as a genuine OEM spare and appears in the Retired Models Parts Catalogue under Chaincase Inner as “111888/A – Oil seal adaptor.” 

Specialist Royal Enfield parts experts describe this as the seal and adaptor plate behind the clutch for 4-speed “classic” engines (350cc, 500cc, 535cc)—a critical clue when customers are unsure which primary/chaincase family they have. 

Using the correct adaptor matters because aftermarket plates often have inconsistent seating and surface finish, which can cause repeat seepage even after changing the seal. If you are doing a clutch rebuild, primary/chaincase opening, or oil leak repair, replacing the adaptor along with the gasket/seal stack is best practice for long-term sealing reliability.

Key Features 

• Genuine Royal Enfield part: 111888/A Oil Seal Adaptor 

• Positioned behind clutch (seal + adaptor plate function in primary/chaincase area) 

• Designed for retired “classic” engine architecture (specialist catalogue reference) 

• Helps restore proper sealing and seating vs. worn/scored adaptor plates

• Strongly recommended during clutch job / primary opening

• Reduced chances of repeat leaks vs. incorrect aftermarket fitment

• Supplied as 1 pc in dealer packaging references

Compatibility Table 

Source basis: Royal Enfield Retired Models Parts Catalogue + specialist description + dealer fitment list. 

Variants

• No variants (Single part: 111888/A). 

FAQs 

1. Where is this part used?
   It’s an oil seal adaptor / adaptor plate behind the clutch, referenced in specialist catalogues for classic engines.

2. Is this genuine Royal Enfield?
   Yes—listed as a certified genuine spare part under 111888/A. 

3. Will it fit UCE / J-Series / 650 Twins / Himalayan?
   No. This part is documented under Retired Models (Non-UCE) chaincase inner group.Do I need anything else with it?
   Commonly replaced with the matching gasket/seal stack during clutch/primary opening (recommended to reduce repeat leaks).

4. How do I avoid ordering the wrong adaptor?
   Match your retired model family + chaincase/gearbox type. If unsure, share a photo of the opened chaincase area with your mechanic.