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
Restore the factory blacked-out left engine side on your Thunderbird with the genuine Royal Enfield 890037 – COVER LH ASSY (Textured/Matt Black). This is the left-hand outer engine cover assembly used on Thunderbird X models and listed by RE parts distributors as “COVER LH ASSY – TEXTURED BLACK / MATT TEXTURE BLACK.” Because it’s OEM, the machined faces, gasket land, standoffs and screw bosses match factory drawings, so the cover bolts up square, seals correctly, and clears the alternator/drive hardware—no shimming or finish mismatch. If your original cover is scratched, cracked, or you’re converting to the Thunderbird X blacked look, this is the correct part. Pair with the RHS cover 890040 (Textured Black) for a complete refresh.
We verified the identity across multiple sources that label 890037 as COVER LH ASSY / COVER LH SUB_ASSY – MATT TEXTURE BLACK, with explicit fitment to NTB 350 / NTB 500 (Thunderbird 350/500). Some retailers generalize to other UCE bikes, but we list only fiche-consistent Thunderbird fitment to reduce returns.
Key Features
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Genuine OE left-hand engine cover assembly — 890037 (Textured/Matt Black).
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Exact OE machining & boss locations for proper sealing/alignment.
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Factory textured black finish to match Thunderbird X components.
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Direct bolt-on on listed models; no fabrication.
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Ideal for accident/cosmetic repairs or black-out conversions.
Compatibility Table
| Model | Platform | Emission / Years | Finish |
|---|---|---|---|
| Thunderbird 350X | UCE 346 cc | BS4 (~2018–2020) | Matt/Textured Black LH cover. |
| Thunderbird 500 / 500X | UCE 499 cc | BS3–BS4 (select years) | Matt/Textured Black LH cover. |
ALSO USED IN CLASSIC MODELS (BLACK CLUTCH COVER MODEL)
CHECK PART NUMBER BEFORE ORDER
Variants / Related
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890040 – COVER RH ASSY (Textured/Matt Black) — matching right-hand engine cover for Thunderbird X/Thunderbird.
FAQs
Q1. Is this the alternator/outer crankcase LEFT cover?
Yes—the left-hand outer engine cover assembly in textured black; fiche names vary between COVER LH ASSY and COVER LH SUB_ASSY.
Q2. Does it include gasket/bolts?
Typically the cover only. Add the LH cover gasket and any O-rings/seals specified for your VIN for best results.
Q3. Will it fit Classic 350/500 UCE?
Not fiche-confirmed. Some sellers claim broader fitment, but we keep it Thunderbird-only to avoid returns. Share your VIN and we’ll check.
Q4. Any install tips?
Drain oil if required, clean gasket land, fit a new gasket, torque in a criss-cross pattern to spec, then inspect for leaks after a warm-up ride.
Verify Fitment on Official Brand Portals
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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