E20 Carburetor Kit for Royal Enfield UCE 350 BS3 (Carb Models) – KLT00003/A (Not for EFI / Not for BS4)

Royal Enfield KLT00003/A is an E20 Carburetor Kit intended for UCE 350 BS3 carbureted engines—a factory-style replacement carb kit designed for ethanol-blended petrol usage. If your older UCE 350 carb bike has started showing hard starting, unstable idle, hesitation, or inconsistent running after regular E20 fuel exposure, a complete OEM-spec carb kit is often a more reliable fix than repeated jet cleaning or local rebuilds.

This is not a “repair kit” or a random aftermarket carb. It is commonly searched as “E20 carb kit,” “E20 carburettor,” “UCE 350 BS3 carb assembly,” “Classic 350 carb BS3,” and “Royal Enfield carburetor kit KLT00003/A.”

Before you buy: confirm your bike is UCE 350 + BS3 + CARB (not EFI), and match your old carb/connector/throttle-cable routing via photo/VIN check.

Key Features

• Genuine-spec complete carburetor kit for UCE 350 BS3 (carb models) (part number search-driven)

• Built for E20 fuel compatibility use-case (E20 carb kit intent)

• Best for fixing: hard starting, rough idle, hesitation, uneven fueling on older BS3 carb bikes (when carb wear is the root cause)

• Direct replacement style kit (not a jet-only service pack)

• Not compatible with EFI / fuel-injected UCE & all J-Series engines (return-prevention constraint)

• Not for BS4 UCE 350 (BS4 uses a different E20 carb kit part number)

• Helps reduce repeat carb issues compared to frequent cleaning on ethanol fuel (practical ownership benefit)

• Recommended installation by a mechanic; final tune/idle-mixture may still be required after fitment

GET IT INSTALLED ONLY BY PROFESSIONALS 

Compatibility Table (Critical)

Variants
TO BUY E20 BS3 CARBURETOR CLICK HERE

TO BUY E20 BS4 CARBURETOR CLICK HERE

TO BUY E20 BS4 CARBURETOR KIT CLICK HERE

FAQs 

Q1 (Fitment): How do I confirm this will fit my bike?
Check 3 things: (1) Engine family: UCE 350 (346cc), (2) Emission: BS3, (3) Fuel system: Carburetor (not EFI). Best method: share VIN/RC + a clear photo of your existing carb + throttle cable routing/connector.

Q2 (Fitment): Will this fit Classic 350 / Bullet 350 / Electra / Thunderbird 350?
Only if your specific motorcycle is UCE 350 + BS3 + carb. It fits all UCE BS3 CARBURETOR.

Q3 (Comparison): Why buy an OEM-spec kit vs an aftermarket carb from Amazon/local market?
Generic carbs often have inconsistent calibration/jetting and variable casting quality, causing repeat issues. An OEM-spec kit is typically chosen for predictable tuning and reliability, especially when switching to ethanol-blended fuel usage patterns. (Also reduces “trial-and-error” installs.) See how generic listings often lump multiple models without BS/EFI checks.

Q4 (Installation): Is it plug-and-play? What should my mechanic check?
It’s a replacement-style kit, but the mechanic should: inspect intake manifold boot, vacuum lines, fuel filter, throttle free-play, and set idle speed/mixture after installation. Use a new clamp/boot if cracked to avoid air leaks.

Q5 (Symptoms): What problems does this solve?
Common carb-related symptoms: hard starting, stalling at idle, flat spots on throttle, erratic fueling, poor response after warm-up, especially if the carb has wear or ethanol-related degradation.

Q6 (Return-prevention): What photo should I send to confirm before ordering?
Send: (1) Full carb photo (left + right side), (2) top view showing throttle cable(s), (3) intake side connection, (4) your RC page showing BS3/BS4, or VIN. If your bike is BS4 carb, do not order this—BS4 uses a different E20 carb kit part number.