Genuine Royal Enfield Classic 500 Chrome Black Air Filter Box Assembly with Sticker – 866252

Genuine Royal Enfield air-filter box assembly with factory-style sticker for compatible legacy Classic 500 Euro 4 / BS4 motorcycles in the Chrome Black colour scheme. Part number 866252 is a colour-specific intake air-box assembly. It is not merely the replaceable air-filter element and should not be selected only by shape or motorcycle name. Match the exact part number, bike colour, VIN and existing assembly before ordering.

What It Is

• Genuine Royal Enfield air-filter box assembly
• Exact manufacturer part number: 866252
• Catalogue finish: Chrome Black
• Supplied as the colour-specific assembly with sticker, subject to the physically sealed factory pack
• Application family: legacy Royal Enfield Classic 500 Euro 4 / BS4
• Right-side intake/air-filter housing area on the compatible motorcycle

What It Is Not

• Not only the disposable air-filter element
• Not a universal air-cleaner box
• Not a carburettor, throttle body or intake manifold
• Not the left-side electrical tool box
• Not the plain black, Chrome Graphite, Chrome Green or other colour-specific air-box assembly
• Not confirmed for Classic 350 Reborn/J-Series, Bullet 350 J-Series or Classic 650

Product Highlights

• Bike name in title: Royal Enfield Classic 500
• Exact SKU: 866252
• Colour-specific: Chrome Black finish with sticker
• Correct component: air-filter box assembly rather than filter element alone
• Generation-aware: intended for compatible legacy Euro 4 / BS4 Classic 500 motorcycles
• Ordering safeguards: VIN, colour code, sticker and existing mounting layout must be checked

Verified Specifications

Confirmed Fitment

Royal Enfield used several visually similar air-box assemblies across Classic 500 colours and markets. A similar shape does not confirm the sticker, finish or emission-version match.

Check Before Ordering

Not Confirmed / Not Compatible by This Listing

Related Colour-Specific Air-Box Assemblies

Purpose and Use

The air-filter box houses the filtration area and connects the clean-air side of the intake system to the engine. The correct enclosure helps maintain sealing, intake routing, filter support and the original side appearance. Replacing it can address a cracked housing, broken mount, damaged sealing surface or incorrect colour assembly, but it cannot by itself correct injector, throttle-body, compression, ignition or engine-management faults.

Box Contents

• 1 × Genuine Royal Enfield Chrome Black air-filter box assembly with sticker, part 866252

Inclusion warning: the catalogue name confirms the colour-specific assembly with sticker. Do not assume that the replaceable filter element, intake boot, clamps, breather hoses, drain tube, rubber grommets, brackets, fasteners or electrical-side components are included unless they are physically present in the sealed package.

Installation Guidance

1. Verify the VIN, Classic 500 Euro 4/BS4 application, colour and exact 866252 requirement.
2. Photograph the existing hose routing, breather connections, clamps, spacers and wiring clearance.
3. Remove the seat and side components using the model-specific workshop procedure.
4. Inspect the intake boot, filter, clamps, drain and breather hoses for cracks or hardening.
5. Transfer only reusable separate components after cleaning and inspection.
6. Fit the air box without forcing mounting tabs or distorting the housing.
7. Ensure all intake joints seat fully and clamps are correctly positioned.
8. Confirm that no wiring, hose or side-panel edge is trapped.
9. Install a serviceable correct filter element and close the housing securely.
10. Start the motorcycle and check for intake leaks, warning lights, abnormal idle and loose mounting.

Installation by a trained Royal Enfield technician is recommended. An unsealed intake joint can allow unfiltered air into the engine.

Inspection and Care Guidance

• Inspect the air-filter element at the specified service interval and more often in dusty conditions.
• Keep the housing, drain and sealing edges clean.
• Do not use harsh solvent or abrasive polish on the Chrome Black finish or sticker.
• Never run the engine with the clean-air intake joint open.
• Replace hardened boots, split hoses and damaged clamps rather than trying to seal them temporarily.
• After washing, confirm water has not entered the housing.

Return-Prevention Checklist

• My motorcycle is a legacy Royal Enfield Classic 500.
• My VIN-specific part number is exactly 866252.
• The bike requires the Chrome Black finish and matching sticker.
• The motorcycle is the compatible Euro 4 / BS4 generation.
• I need the complete air-filter box assembly, not only the filter element.
• I compared mounting tabs, intake joints, hose positions and sticker.
• I confirmed separately which service parts and hardware are required.
• I will record one uninterrupted unboxing video from the sealed parcel through complete inspection.

Correctly supplied items are not returnable. Replacement is available only for a wrong or transit-damaged item, subject to an uninterrupted unboxing video and notification within 24 hours of delivery. An assembly that has been installed, scratched, drilled, modified, sticker-damaged, fuel/oil contaminated or returned incomplete cannot be accepted.

Why Buy from Under The Hood?

• Exact Classic 500 bike name and Chrome Black finish in the title
• Housing assembly clearly distinguished from the filter element
• Euro 4 / BS4 generation guidance included
• Colour-specific alternatives listed to prevent appearance mismatches
• Fitment, sealing and installation checks written for real buyers
• GST invoice where applicable and support for domestic and international Royal Enfield parts orders

Buyer Search Terms

Royal Enfield 866252, Classic 500 air filter box, Classic 500 Chrome Black air box, C5 air filter assembly with sticker, Classic 500 BS4 air cleaner housing, Classic 500 Euro 4 intake box, genuine Royal Enfield air filter housing.

Frequently Asked Questions

1. What is Royal Enfield part 866252?

It is the genuine Chrome Black air-filter box assembly with sticker for compatible legacy Classic 500 applications.

2. Which bike name should I match?

Royal Enfield Classic 500, specifically the compatible legacy Euro 4 / BS4 family.

3. Is this only an air-filter element?

No. It is the air-filter box or housing assembly; the replaceable filter element is a separate service item unless physically included.

4. What colour is 866252?

The catalogue identifies it as Chrome Black.

5. Does it come with a sticker?

The catalogue description specifies an assembly with sticker.

6. Does it fit Classic 350 Reborn?

No fitment is claimed. The J-Series Classic 350 uses a different intake system.

7. Does it fit every Classic 500?

Do not assume universal fitment. Verify VIN, emission generation, market version, mounting and colour.

8. Is it for BS4 / Euro 4 motorcycles?

Yes, the catalogue description associates 866252 with the Euro 4 / BS4 Classic 500 application.

9. Is 866247 the same part?

No. 866247 is listed as a black colour-specific air-filter assembly with sticker.

10. What is 806130?

It is a Chrome Graphite colour-specific air-filter box assembly, not Chrome Black.

11. Are other colours interchangeable?

They may share a catalogue family, but appearance, sticker and exact VIN application differ. Order the specified part number.

12. Is the filter element included?

Filter inclusion is not promised unless it is physically present in the sealed package.

13. Are hoses and clamps included?

No hose, boot, clamp or fastener inclusion should be assumed without checking the package.

14. Can a cracked air box affect performance?

Yes. A leak on the filtered side can disturb intake sealing and may allow unfiltered air into the engine.

15. Can this fix an EFI warning light?

Not automatically. EFI faults require proper diagnosis of sensors, wiring, throttle body, injector and intake sealing.

16. Why must the sticker and colour be checked?

Royal Enfield catalogues list multiple visually related assemblies with different finishes and stickers.

17. Is professional installation recommended?

Yes. Correct hose routing, mounting and airtight intake connections are important.

18. How should the finish be cleaned?

Use mild soap, water and a soft cloth. Avoid harsh solvent and abrasive polish.

19. Can it be returned after fitting?

No. Installed, scratched, modified, contaminated or sticker-damaged parts are not returnable.

20. How do I avoid ordering the wrong assembly?

Match 866252, Classic 500, Euro 4/BS4, Chrome Black, sticker design, VIN, mountings and intake connections before purchase.