Royal Enfield 1990218 Black Oil Filler Cap – Machined Billet – 650 Twins, Himalayan / Scram 411, J-Series 350 & 450 Series (GMA Accessory)

Royal Enfield part number 1990218 is a black machined aluminium oil filler cap (GMA accessory) that fits a wide range of modern Royal Enfield motorcycles, including Interceptor 650, Continental GT 650, Himalayan / Scram 411, J-Series 350s (Classic, Bullet, Meteor, Hunter, Goan Classic), and new platforms like Super Meteor 650, Shotgun 650, Classic 650, Bear 650, Himalayan 450, Scram 440 and Guerrilla 450.

Official Royal Enfield GMA pages describe 1990218 as a “Black Oil Filler Cap” machined from billet aluminium with a separate branded infill that is fitted last so the Royal Enfield logo always sits perfectly upright. Dealers like SAP Motors and Riders Junction confirm it as the factory GMA oil cap for multiple models, with anodised black finish and approx.

Unlike generic engine caps, this is a genuine Royal Enfield accessory: the thread pitch, sealing surface and depth match the OEM cap, so oil level, breather function and sealing remain correct. You get an instant visual upgrade on the engine case plus long-term durability thanks to quality alloy and anodising.

Most competitor listings only say “Black Oil Filler Cap 1990218” and show 2–3 models. Under The Hood goes further with a verified model list, FAQs, and fitment warnings to cut down guesswork and returns. If your bike appears in the compatibility table below, this is the correct black oil filler cap for your engine; if not, we recommend confirming via VIN and RE GMA before ordering.

Key Features

• Genuine Royal Enfield GMA accessory – Part No. 1990218, officially named Black Oil Filler Cap / Oil Cap Filler, Machined, Black.

• Billet aluminium construction with anodised black finish for a premium look and excellent corrosion resistance.

• Separate branded logo infill is fitted last so the Royal Enfield logo can always be aligned upright – a detail most sellers don’t explain.

• Official GMA compatibility across multiple platforms: 650 Twins, J-Series 350, LS410 Himalayan/Scram 411 and new 450/650 platforms (see table for exact models).

• Designed to replace the stock engine oil filler cap without affecting oil level or breather performance when used on supported models.

• Quick DIY upgrade – typical fitting time quoted by RE and dealers is around 5–10 minutes; requires only basic hand tools.
  

• Gives a clean, custom look to the engine side cover, ideal for owners who have already upgraded guards, mirrors and levers.

• Verified by official GMA portals + multiple dealers (SAP Motors, Riders Junction, Amazon GMA store, international RE parts sites) – not a replica or universal cap.

Compatibility Table

(Only models with confirmation from RE GMA + at least one dealer/parts listing are included – no guesswork.)

650 Twin Platform

LS410 & Sherpa 450 / Scram Platforms

J-Series 350 Platform

If a customer’s bike is not listed above, advise: “Fitment not confirmed – please verify via your VIN on Royal Enfield’s GMA portal or contact us before ordering.”

Variants

From a Shopify perspective, treat 1990218 as one main variant by colour, with future cross-sell to the silver cap:

• Colour:

  • Black – Part No. 1990218 (this product)

You can later add a separate product for the silver cap (different part number) and link it as “Also available in Silver” in the description.

What’s in the Box :

• 1 × Genuine Royal Enfield Black Oil Filler Cap – Part No. 1990218

• (Reuses existing O-ring / seal from your stock cap, or new seal if provided in OE packaging.)

FAQs

Q1. What is Royal Enfield part number 1990218?
Royal Enfield part number 1990218 is a Black Oil Filler Cap, a genuine GMA accessory machined from billet aluminium with a black anodised finish and separate branded logo infill.

Q2. Which bikes is the 1990218 oil filler cap compatible with?
According to Royal Enfield GMA and leading dealers, 1990218 fits: Interceptor 650, Continental GT 650, Himalayan 410/411, Scram 411, Hunter 350, Meteor 350, Classic 350 (J-Series), Bullet 350 (J-Series), Goan Classic 350, Super Meteor 650, Shotgun 650, Classic 650, Bear 650, Himalayan 450, Scram 440 and Guerrilla 450.

Q3. Does this oil filler cap change my engine’s oil level or performance?
No. It is a cosmetic + quality upgrade that replaces the stock filler cap. When fitted correctly on a supported model, it does not alter oil capacity or tune; it simply provides better materials and a premium look.

Q4. Is 1990218 universal for all Royal Enfield bikes?
No. It is compatible with a large list of modern models, but not with every older Bullet / Thunderbird / Electra. If your motorcycle is not mentioned in the compatibility table, please verify via VIN and GMA or contact us before ordering.

Q5. Is this part genuine or aftermarket?
This listing on UNDER THE HOOD is for a 100% genuine Royal Enfield GMA accessory, sourced through official channels, not a copy or “inspired” product.