Oil Pump Sub Assembly for Bullet 350 ES BS4 / Select Classic, Thunderbird & Electra UCE Models – Genuine Royal Enfield 572641/A

Royal Enfield 572641/A is a genuine OEM oil pump sub assembly used in the UCE BS4 engine family.

This is the correct OEM replacement when the engine is being rebuilt, oil pressure is suspect, internal lubrication components are being renewed, or the old oil pump assembly is worn or damaged. Also searched as oil pump assy, engine oil pump, UCE oil pump, and oil pump sub assy. Competitor listings often stop at the part number and generic description, but do not explain the supersession or the fact that public fitment evidence is uneven across UCE models.

Before you buy: match 572641/A, confirm your motorcycle is a UCE model, and verify by VIN, engine family, or old-part photo before ordering. The strongest checked model-specific fitment is Bullet 350 ES BS4; broader UCE mapping exists on seller listings but is weaker than model-specific confirmation.

Key Features

• Genuine Royal Enfield OEM part number 572641/A.

• Official description: OIL PUMP SUB ASSY.

• Replaces older part 570777/A OIL PUMP ASSY.

• Strongest checked model-specific fitment: Bullet 350 ES BS4.

• Broad seller mapping commonly places it across UCE Bullet / Classic / Thunderbird / Electra families.

• Important internal lubrication component for the UCE engine

• Best replaced during engine overhaul or oiling-system repair

• OEM fit is safer than using unknown aftermarket oil pump assemblies

• Best ordered by part number + engine family + old-part match

Compatibility Table 

Variants
No variants.

FAQs 

Q1. Which bike is 572641/A actually confirmed for?
It fits all UCE 350 CC BS4 model. 

Q2. Will this fit all UCE bikes?
Not safely as a blanket claim. Several sellers list it across Bullet, Classic, Thunderbird, and Electra UCE models, but public model-specific confirmation in this pass is strongest only for Bullet 350 ES BS4. Match by VIN, old part, or engine family before ordering.

Q3. Is 572641/A the replacement for 570777/A?
Yes. The Bike-Parts-RoyalEnfield price index explicitly shows 570777/A OIL PUMP ASSY with 572641/A OIL PUMP SUB ASSY as the replacement.

Q4. OEM oil pump vs local aftermarket oil pump — why choose genuine?
An oil pump is a core engine-lubrication component, so OEM fit and internal tolerances matter. Public sources show Royal Enfield using a specific replacement chain from 570777/A to 572641/A, which supports ordering by exact OEM number instead of generic compatibility claims.

Q5. What symptoms suggest this part may need replacement?
Typical reasons include engine rebuild work, suspected lubrication issues, worn oil-pump internals, or replacing damaged engine oiling components during overhaul. This is an inference based on the part function as an oil pump assembly.

Q6. Can I install it myself?
This is usually a workshop-level engine-side repair rather than a simple external bolt-on. It is best fitted during a proper engine service or rebuild by someone comfortable with internal engine work.

Q7. How do I avoid ordering the wrong oil pump?
Match 572641/A, confirm the bike is UCE, compare your old part number if available, and use a VIN / engine / old-part photo check before purchase. That is especially important because online sellers often over-list UCE compatibility.