Royal Enfield 1990613 Silver Oil Filler Cap — OEM Machined Cap for Classic / Bullet / Electra UCE

Elevate your UCE engine’s finish with the Royal Enfield Silver Oil Filler Cap (Part No. 1990613), a genuine GMA accessory built for style and precision. Machined from billet aluminium and anodized silver, this cap includes a branded inlay fitted last, ensuring the Royal Enfield logo always stays correctly oriented. 

Fitted in approximately 5 minutes, it replaces the stock oil filler cap while preserving thread integrity and sealing. Compatible with Classic 350/500 UCE, Bullet 350/500, Electra 350, Thunderbird 350/500 / TBX (pre-Sept-2021 models) per RE’s accessory listing. 

Choose 1990613 for a subtle upgrade to your engine bay — it’s OEM quality, signature RE detailing, and perfect for riders who value both form and function.

Key Features

• Genuine Royal Enfield OEM / GMA accessory — Part No. 1990613 

• Machined from billet aluminium, anodized silver finish for durability & aesthetics 

• Unique separate branded inlay fitted last so logo orientation is correct always 

• ~5 minute installation / replacement on compatible models 

• Compatible with UCE platform: Classic, Bullet, Electra, Thunderbird / TBX (pre-Sept 2021)

• OEM dimensions ensure proper sealing & thread fit

Compatibility Table

Variants / Notes

• 1990613 — Silver / clear anodized variant

• The same style is also offered in black finish under part 1990645 (for example) in RE’s catalog. 

• The branded inlay is a separate insert — in some cases users can swap or reorientation is possible

FAQs

Q1: Will this fit my BS6 / J-series engine?
A1: Not unless the engine’s filler cap dimensions and threading match exactly. This cap is intended for UCE platforms as per RE’s listings.

Q2: Is installation difficult?
A2: No — RE lists it as a ~5 minute job. Remove stock cap, attach new cap with seal, ensure the inlay is aligned. 

Q3: Does the branded inlay rotate / misalign?
A3: No — the inlay is installed last so the logo always sits correctly when tightened. 

Q4: Does using this void warranty?
A4: No — as a genuine RE accessory, when used correctly it should not void warranty on the engine or parts.

Q5: Does it leak or compromise seal pressure?
A5: No — it uses OEM threading and sealing geometry; ensure gasket/washer is clean & properly torqued.