Royal Enfield Genuine Cylinder Barrel Assembly (Cylinder Block) Textured Black VT31 for Bullet 350 UCE Kick Start BS3 – 890055

890055 is a Royal Enfield Genuine Cylinder Barrel Assembly (Cylinder Block / Barrel / Jug) finished in Textured Black for the VT31 (UCE 350) engine family. It’s the core top-end component that houses the piston/rings and forms the cylinder bore—critical for compression, oil control, and long-term engine reliability. This part is listed by independent OEM dealers as fitting Bullet 350 Kick Start (KS) – BSIII.

Replace the barrel when the bore is scored, out-of-round, or worn beyond safe honing, or when you’re seeing low compression, oil burning, smoke under load, repeated plug fouling, or piston slap noise after a rebuild. OEM machining and bore finish matter here—wrong tolerances can cause early ring wear and repeat failures.

Also searched as: UCE 350 cylinder barrel, Bullet 350 KS cylinder block, engine barrel, cylinder jug, VT31 barrel.

Before you buy: Confirm UCE 350 (VT31) + Kick Start BSIII on RC/engine and match your old barrel/finish by photo before dispatch.

Key Features 

• Genuine Royal Enfield part: CYLINDER BARREL ASSY TEXTURED BLACK–VT31 (PN 890055)

• Fitment listed for Bullet 350 KS – BSIII by multiple OEM dealers

• Correct OEM bore finish/tolerance for reliable ring sealing and compression retention

• Fixes root causes of low compression due to bore scoring/out-of-round wear (when barrel is the issue)

• Best choice for professional top-end rebuilds (avoid “similar-looking” barrels)

• Helps reduce repeat rebuild risk caused by inaccurate aftermarket machining

• Important return-prevention: order by part number + platform (VT31) + BS stage

• Supersession-aware: older numbers can map to 890055 (see Research Log)

Compatibility Table 

ORDER ONLY AFTER PART NUMBER CONFIRMATION 

Explicit exclusions (return-prevention): Do not buy for J-Series 350, and do not assume fitment for ES/Classic/TBird without VIN/photo confirmation.

Variants
No variants.

FAQs 

Q1 (Fitment): How do I confirm 890055 is correct for my bike?
Confirm Bullet 350 Kick Start (KS) and BSIII on your RC/engine family (VT31 UCE 350), then match the existing barrel by photo (cooling fin pattern/finish) or verify by VIN in official EPC at a dealer. Dealer mapping lists it for Bullet 350 KS – BSIII.

Q2 (Fitment): Will 890055 fit Bullet 350 ES or Classic 350 UCE?
Not confirmed in the verified fitment mapping for this part number. UCE 350 barrels can differ by application/finish/spec. Order only after VIN/EPC confirmation or exact old-part match.

Q3 (Comparison): OEM barrel vs aftermarket barrel—what’s the real difference?
OEM barrels are manufactured to RE’s bore tolerance and surface finish specification. Aftermarket barrels can vary in machining accuracy, which may cause early ring wear, overheating, and repeat rebuilds.

Q4 (Installation): What should my mechanic check during installation?
Measure bore and piston clearance, check ring end-gap, use new gaskets, follow torque sequence, and ensure oiling passages are clean. This is a top-end rebuild component—professional installation is recommended.

Q5 (Symptoms): What problems does a new cylinder barrel solve?
Low compression, excessive blow-by, oil burning/smoke, scored bore, piston slap noise, repeated plug fouling—when diagnosis points to bore wear/damage.

Q6 (Returns-prevention): What should I share before ordering to avoid mismatch?
Share RC details (model + KS/ES + BS stage), plus clear photos of your current barrel and engine area. If you have VIN, use it for EPC verification before dispatch.