Royal Enfield 1990651 Silver Front Reservoir Cap – Machined Front Master Cylinder Cap for Classic 350/500, Bullet 350/500, Electra, Thunderbird, Himalayan, Scram 411/440, Interceptor 650 & Continental GT 650 (Genuine OEM)

Royal Enfield part number 1990651 is the Silver Front Reservoir Cap – a machined aluminium front master cylinder cap designed to upgrade the look and durability of the front brake reservoir on a wide range of Royal Enfield motorcycles, including Classic 350/500, Bullet 350/500, Electra, Thunderbird 350/500, Himalayan, Scram 411/440, Continental GT 535, Interceptor 650 and Continental GT 650.

Official Royal Enfield GMA catalogues and the current India accessories page describe 1990651 as a machined front master cylinder cap with silver anodized finish, made from aluminium, branded with the Royal Enfield logo, with a fitting time of around 10 minutes. Genuine OE replacement for the stock front brake reservoir lid on UCE Classics, Trials, Himalayan and both 535 and 650 GT/INT platforms.

Most competitor listings only say “Silver Front Reservoir Cap 1990651 for Interceptor/GT” and skip the rest of the platform list, warranty and fitment notes. Here we provide the full, verified compatibility so customers can order by model with confidence and reduce returns.

If your motorcycle is in the compatibility table below and uses the rectangular front brake reservoir with matching screw spacing, this is the correct genuine Royal Enfield 1990651 Silver Front Reservoir Cap upgrade.

Key Features

• Genuine Royal Enfield OEM / GMA accessory – Kit No. 1990651, described as Silver Front Reservoir Cap / Machined Front Reservoir Cap.

• Machined aluminium front master cylinder cap with silver anodized finish for durability and premium appearance.

• Designed as a direct replacement for the stock front brake reservoir lid on supported Royal Enfield models – no modifications required.

• Royal Enfield branded cap matches factory styling while giving a subtle custom, machined look on the handlebar area.

• Official GMA spec lists fitting time ~10 minutes – simple DIY job with basic tools (Phillips screwdriver), following correct bleeding precautions if necessary.

• Compatibility verified across UCE Classic/Bullet/Electra/Thunderbird, Trials 350/500, Himalayan LS410, Scram 411/440 and 650 Twins (INT/GT) – not a universal cap.

• Genuine OE sealing design helps maintain proper brake fluid containment and reservoir venting, unlike some flat universal covers.

• Ideal upgrade when you are already adding GMA levers, mirrors or guards and want a clean, detailed cockpit that still stays 100% OEM.

Compatibility Table

(Only models confirmed via Royal Enfield GMA catalog + official India accessories page + at least one dealer are listed. No guesswork.)

UCE Classic / Bullet / Electra / Thunderbird / Trials

Himalayan / Scram

650 Twin Platform

*Years are approximate based on model production; always match via bike, year and reservoir screw pattern before final confirmation.

If a customer’s bike is not listed above, treat fitment as not confirmed and advise checking via VIN and the official Royal Enfield parts / accessories portal before ordering.

Variants

This SKU itself is one specific finish:

• Silver – Part No. 1990651 – Machined Front Reservoir Cap

Recommended cross-sell (separate product):

• 1990652 – Black Front Reservoir Cap (same design, black anodized finish).

What’s in the Box (suggested text for the listing):

• 1 × Genuine Royal Enfield Silver Front Reservoir Cap – Part No. 1990651

• Any OE screws / sealing hardware that come in original RE packaging (varies by batch; reuse original screws if not supplied).

FAQs

Q1. What is Royal Enfield part number 1990651?
Royal Enfield 1990651 is the Silver Front Reservoir Cap, a machined aluminium front master cylinder cap with silver anodized finish, designed as a genuine OE upgrade for the front brake reservoir on multiple Royal Enfield models.

Q2. Which bikes are compatible with 1990651?
Official GMA catalogues and the India accessories page list compatibility with Classic 350/500 (UCE), Bullet 350/500, Electra 350, Thunderbird 350/500, Bullet Trials 350/500, Himalayan 410/411, Scram 411, Scram 440, Continental GT 535, Interceptor 650 and Continental GT 650.

Q3. Is this only for looks, or does it affect braking?
Functionally it replaces the top cover of the front brake master cylinder reservoir. As long as it is installed correctly with the proper gasket/screws, it does not change braking performance – it is mainly a styling and durability upgrade over the stock lid.

Q4. What is the difference between 1990651 and 1990652?
Both are machined front reservoir caps with the same fitment. 1990651 is Silver anodized, while 1990652 is Black anodized. Choose based on the colour scheme of your bike.

Q5. Do I need to bleed the brakes when installing this cap?
In most cases, if you only swap the cap carefully without disturbing the internal diaphragm or spilling fluid, you do not need to bleed the system. However, any sign of air in the line, spongy lever feel, or fluid loss should be corrected by a proper brake bleed by a trained technician.