• 890037 COVER LH ASSY textured black – Thunderbird 350X/500
  • Thunderbird X blacked engine left cover – OEM 890037
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UNDER THE HOOD

890037 – COVER LH ASSY (Left Engine Cover, Textured/Matt Black) for Thunderbird 350X (UCE) & Thunderbird 500 (UCE) – Genuine Royal Enfield

890037 – COVER LH ASSY (Left Engine Cover, Textured/Matt Black) for Thunderbird 350X (UCE) & Thunderbird 500 (UCE) – Genuine Royal Enfield

Rs. 2,300.00
Rs. 2,400.00 Rs. 2,300.00
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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

  • Genuine OE left-hand engine cover assembly — 890037 (Textured/Matt Black). 

  • Exact OE machining & boss locations for proper sealing/alignment.

  • Factory textured black finish to match Thunderbird X components. 

  • Direct bolt-on on listed models; no fabrication.

  • 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

  • 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.

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