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UNDER THE HOOD

Royal Enfield Air Filter Element – UCE for Thunderbird 350 & Thunderbird 350X (BS-IV/ABS) — 521172/A | Genuine OE

Royal Enfield Air Filter Element – UCE for Thunderbird 350 & Thunderbird 350X (BS-IV/ABS) — 521172/A | Genuine OE

Rs. 178.00
Rs. 185.00 Rs. 178.00
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Important Order Policy
Please order only after confirming the part number, model, variant, year, side, connector type and compatibility. All orders are non-cancellable once placed. Correctly shipped spare parts are not eligible for return, exchange or refund due to wrong selection, wrong diagnosis, fitment mismatch, mechanic recommendation or change of mind. Electrical/electronic items are additionally non-returnable once opened, installed, plugged in, tested or used. Wrong item, damaged item or missing item claims require a complete unboxing video within 24 hours. Read full Return & Warranty Policy

Keep your Thunderbird 350 / Thunderbird 350X (UCE) breathing clean with the genuine Royal Enfield Air Filter Element — Part No. 521172/A. This OE element is the factory-specified filter for UCE Thunderbird  variants, ensuring correct airflow, filtration and idle quality without any rejetting or ECU changes when the intake/exhaust are stock. Because it’s OEM, the media density, sealing lip and overall dimensions match the original housing—so it’s a clean, drop-in replacement that maintains mileage and protects rings, valves and throttle response in dusty Indian conditions.

This listing is strictly scoped to Thunderbird 350 (UCE,) and Thunderbird 350X (UCE) per the Royal Enfield spares portal evidence you provided. It is not for J-Series models (Classic Reborn/Meteor/Hunter) and not for older non-UCE Thunderbird airboxes that used different filter formats. Choose genuine to avoid fitment surprises and reduce returns.
Name/PN confirmation: “AIR FILTER ELEMENT T1 — 521172/A.

Key Features

  • Genuine OE Royal Enfield element — 521172/A for UCE Thunderbird BS-IV/ABS.

  • Direct drop-in fit; no trimming or hacks.

  • OE paper media & pleat geometry for stable fueling and filtration.

  • Helps maintain mileage and throttle response in city and touring use.

  • Built for dusty conditions; replace per schedule (earlier if severe dust).

  • Tight scoping (TB/TBX UCE BS-IV) to avoid misorders/

Compatibility Table (Confirmed Scope)

Model Engine/Platform BS Stage Notes
Thunderbird 350 (UCE) 346 cc UCE BS-IV,3 ABS/BS-IV variants (official portal mapping confirms 521172/A). (Per screenshot supplied.)
Thunderbird 350X (UCE) 346 cc UCE BS-3,IV/ABS Uses same UCE Thunderbird BS-IV airbox family; 521172/A applies.

Exclusions (to prevent returns):

  • J-Series (Classic 350 Reborn, Meteor, Hunter) — different filter family.

  • Pre-UCE Thunderbird (older “T1” canister families differ by housing).

  • Classic/Bullet/Electra UCE — typically use a different panel element.

Variants

Single item: 521172/A – Air Filter Element (Qty 1). No LH/RH or color variants.

FAQs

Q1. Will this fit Thunderbird 350X ABS?
Yes—this listing is scoped for UCE Thunderbird BS-IV/ABS, including TBX.

Q2. I have Classic/Bullet UCE—can I use this?
No. Those use a different OEM element; order the model-specific UCE filter.

Q3. Do I need tuning after installing?
No. It’s OE spec. Keep intake/exhaust stock for best results.

Q4. How often should I replace it?
Follow the service schedule; replace sooner in dusty conditions to protect the engine.

Verify Fitment on Official Brand Portals

For selected genuine spare parts, you can cross-check the part number on the official brand portals before ordering.

Royal Enfield Official Spares Portal

Hero MotoCorp Official eCatalogue

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