NIMTEK 49cc Scooter Carburetor for GY6 50cc PD18J – Aluminium Body, Upgraded Jets, 2‑Pin Choke

NIMTEK's 49cc carburetor is a direct-fit replacement for GY6 50cc (PD18J) 4-stroke scooter engines, delivering improved idle control and reliable fuel delivery.

This high-quality aftermarket carburetor is built to work with 49cc–50cc GY6 4-stroke scooters, ATVs, go-karts and mopeds that use the PD18J/139QMB/139QMA platform. It comes with upgraded jets and a 2-pin male electric choke plug, and the aluminum body and precision-machined passages are designed for consistent performance and long service life. Confirm measurements against your existing unit before installation to ensure correct fitment.

Will this carburetor fit my 50cc GY6 scooter or ATV?

Most Chinese-made 49cc–50cc GY6 4-stroke engines that use the PD18J/139QMB/139QMA pattern will accept this carburetor. Compare critical dimensions and plug type to verify compatibility.

• Idle jet: 33 mm
• Main jet: 78 mm
• Intake manifold inner diameter: 18 mm
• Air filter intake inner diameter: 35 mm
• Electric choke: 2-pin male plug

How does the upgraded jetting affect performance?

Upgraded jets tune fuel flow for more stable idling and smoother throttle response across common load ranges. They help reduce hunting at idle and improve throttle pickup when accelerating from low speeds.

• Improved idle stability with 33 mm idle jet
• Smoother mid-range via 78 mm main jet sizing
• Better throttle response with matched intake diameters

What should I check before installing this carburetor?

Confirm that the physical dimensions and electrical connector match your scooter. Also check throttle and choke cable lengths, mounting bolt pattern, and the air filter connection size to avoid adjustments or additional adapters.

• Match intake manifold inner diameter: 18 mm
• Confirm air filter intake inner diameter: 35 mm
• Ensure 2-pin male electric choke plug compatibility
• Compare mounting flange and throttle linkage positions

How durable and serviceable is the NIMTEK carburetor?

The carburetor is manufactured from durable materials with replaceable jets and standard fittings, making routine maintenance and cleaning straightforward. Regular cleaning of jets and passages will extend service life and maintain fuel delivery accuracy.

• Aluminum body with precision-machined passages
• Replaceable jets for tuning or repair
• Standard 2-pin electric choke plug for simple wiring
• Designed for long-term use with proper maintenance

Who is this for: The NIMTEK 49cc carburetor is aimed at riders and DIY mechanics who own 49cc–50cc GY6 4-stroke scooters, ATVs, go-karts or mopeds and need a reliable replacement or a performance-minded upgrade. Ideal for owners of common Chinese brands (TAOTAO, ROKETA, SUNL, JONWAY, JMSTAR, TANK, PEACE, Dongfang, Kazuma, JCL, BMS) who want straightforward installation, better idle control, and the flexibility to tune jetting for local fuel and elevation conditions.