Royal Enfield Classic 350 (BS3 Carb) Carburetor Flange Kit / Intake Manifold Rubber – KLT00001

A worn carburetor flange (intake manifold rubber) is one of the most common hidden causes of unstable idling, air-leak hunting, backfiring on decel, and poor throttle response on carbureted Royal Enfield 350s. The Royal Enfield Carburetor Flange Kit – KLT00001 is the correct replacement flange kit used on Classic 350 carburetor (BS3) applications and restores an airtight seal between the carburetor and cylinder head. 

Unlike many soft aftermarket rubbers that crack early from heat and fuel vapors, an OE-spec flange kit is designed for the engine bay temperature cycles and long-term sealing—critical for reliable cold starts and consistent fueling. This is a small part, but it directly affects rideability and can prevent repeated carb tuning problems caused by unmetered air leaks.

If your Classic 350 is carbureted (BS3-era) and you see visible cracks on the intake rubber or experience erratic idle even after carb cleaning, replacing the flange is a highly effective fix.

Key Features 

• Genuine-spec Carburetor Flange Kit identified by part number KLT00001 

• Application noted for Classic 350 carburetor assembly (BS3) 

• Helps eliminate air leaks that cause hunting idle and lean running (common carb issue)

• Restores proper seal between carb and intake for smoother throttle response

• Ideal preventive replacement during carb overhaul / tuning

• Listed under UCAL branding on dealer catalog (as shown in listing metadata) 

• OEM part-number reference also shown as KLT00001/A by an export parts seller 

Compatibility Table (Confirmed Only)

• PLEASE CHECK PART NUMBER BEFORE PURCHASE 

Variants

• No variants (single kit listing)

FAQs 

1. What is a “carburetor flange” on Classic 350?
   It’s the rubber/insulator piece between the carburetor and the engine intake. If it cracks or hardens, it creates an air leak and the bike runs lean/unsteady.

2. How do I confirm my bike is BS3 carburetor model?
   Check your RC/registration (BS stage), and physically confirm you have a carburetor (not EFI throttle body). If it’s EFI/BS4/BS6, this part is typically not applicable.

3. Symptoms of a damaged flange—how do I know it’s the problem?
   Common signs: fluctuating idle, engine stalling at idle, popping/backfire on decel, hard starting, and tuning that never “holds” after carb cleaning.

4. Is KLT00001 the same as KLT00001/A?
   Some catalogs show the same item with a suffix (example: KLT00001/A). Treat the core part number as the match key and verify via microfiche/authorized catalog before dispatching. 

5. Should I replace this during carb cleaning/service?
   Yes—if the rubber shows cracks, is oil-soaked, or has hardened. Replacing it during a carb overhaul prevents repeat air-leak issues.

6. Does this kit include clamps/extra items?
   “Kit” contents can vary by packaging batch. Best practice: match the delivered contents to the product photos and your old part before installation.