Royal Enfield Washer Seal Rocker Cover for UCE Models – 573906/A

Royal Enfield Washer Seal Rocker Cover for UCE Models – 573906/A

573906/A is a genuine Royal Enfield washer seal for the rocker cover. Public Royal Enfield fiche-style sources identify this part exactly as WASHER SEAL ROCKER COVER, and dealer references show it as a shared engine sealing hardware part used across multiple UCE-era Royal Enfield motorcycles rather than a one-model-only spare.

This is the kind of small but critical part customers usually struggle to find, especially during rocker cover work, top-end servicing, oil leak diagnosis, or engine reassembly. Buyers also search for this as rocker cover sealing washer, valve cover washer seal, Royal Enfield rocker cover washer, top cover sealing washer, and UCE rocker cover oil seal washer. Because it is a shared engine sealing part, the best listing position is part number + function + known UCE model coverage, not vague generic “engine washer” wording.

Seller references tie this part to a wide UCE family including TBTS, Bullet 350 UCE (KS/ES), Electra 350 UCE (ES), Classic 350, Classic 500 EFI, Thunderbird 350, Thunderbird 500, and Continental GT. Bike-parts fiche context also shows the same part number in the Classic 500 cylinder head diagram. Before you buy: match the old washer/seal style and confirm your motorcycle is one of the supported UCE applications.

Key Features

• Genuine Royal Enfield OEM rocker cover washer seal
• Part number: 573906/A
• Official description: Washer Seal Rocker Cover
• Used in rocker cover / cylinder head sealing hardware application
• Shared across multiple Royal Enfield UCE models
• Important for top-end service, rocker cover refit, and oil leak prevention
• Useful when the old sealing washer is hardened, crushed, leaking, or missing
• Best ordered by part number and old-part visual match

Compatibility Table

Variants

No variants under this SKU. Related nearby cylinder-head sealing hardware in Royal Enfield lists includes 573907/A, also described as Washer Seal Rocker Cover but listed separately with a different price point in parts indexes.

Before You Buy Checklist

• Confirm your bike is one of the supported UCE applications
• Match the old washer/seal style before ordering
• Check whether you need one piece or multiple pieces for the service job
• Do not order for newer J-Series or unrelated platforms without proof
• Use part number + engine family + visual match as the safest buying method

FAQs

1) What is 573906/A?
It is the genuine Royal Enfield washer seal for the rocker cover.

2) Which bikes are safely confirmed for this part?
The current strongest evidence supports TBTS, Bullet 350 UCE KS/ES, Electra 350 UCE ES, Classic 350, Classic 500 EFI, Thunderbird 350, Thunderbird 500, and Continental GT in seller references.

3) Is this an important part even though it is small?
Yes. It is a sealing hardware piece used around the rocker cover area, so using the correct washer seal matters during reassembly and oil leak prevention.

4) Does it fit J-Series Classic 350 or new Bullet 350?
No trustworthy source support was found for those newer platforms, so they should stay excluded.

5) OEM or aftermarket?
This is a genuine Royal Enfield OEM part number.

6) What problem does this solve?
It replaces an old, flattened, leaking, damaged, or missing rocker cover sealing washer during top-end service or repair.

7) What should I check before ordering?
Check the exact bike model, engine family, and old washer/seal shape. Also confirm the number of pieces needed for your service job.

Also Searched As

rocker cover washer seal, valve cover washer Royal Enfield, top cover sealing washer UCE, rocker cover oil seal washer, cylinder head cover washer RE, Royal Enfield rocker cover sealing washer.