Carburetor PD18J with Electric Choke for 4-Stroke GY6 49cc 50cc Chinese Scooter 139QMB

GOOFIT PD18 18mm High-Precision Carburetor for GY6 49cc & 50cc Scooters

Restore your scooter's reliability and smooth idling. The GOOFIT PD18 is a premium-grade 18mm carburetor specifically engineered for the GY6 49cc/50cc 139QMB engine—the most popular 4-stroke scooter engine in the world. Whether you are dealing with a clogged stock carb or looking to optimize a 100cc Big Bore Kit, this unit provides the consistent fuel atomization required for daily city commuting.

This unit comes equipped with a 2-pin male electric choke, ensuring your scooter starts effortlessly even on cold mornings. Pre-installed with a #75 main jet, it is tuned to provide the perfect balance of fuel efficiency and throttle response for standard 50cc setups and mildly upgraded engines.

Product Compatibility

• Engine Type: GY6 49cc, 50cc, 80cc, and 100cc 4-Stroke (139QMB / 139QMA).
• Scooter Brands: Fits Taotao, Kymco, Jonway, Baja, Wolf, Peace Sports, VIP, and most Chinese-manufactured mopeds.
• Fitment Note: Please verify your wiring harness uses a 2-pin male plug for the electric choke.

Key Technical Specifications:

• Main Jet: #75 (Standard High-Performance)
• Intake Manifold (Inner Diameter): 18mm (0.70")
• Intake Manifold (Outer Diameter): 28mm (1.10")
• Air Filter Mounting (Outer Diameter): 39mm (1.53")
• Electric Choke: 2-Pin Male Plug

Why Choose the GOOFIT PD18 Series?

• Electric Choke Reliability: The integrated auto-bypass (electric choke) eliminates the need for manual levers, automatically adjusting the air-fuel mixture for easy one-touch starting.
• Big Bore Compatibility: Unlike standard 17mm carbs, the 18mm bore provides the additional airflow needed for those who have upgraded to 80cc or 100cc big bore kits.
• Stable Idle Performance: Precision-machined internal circuits prevent the "stalling at red lights" common in cheap aftermarket units, providing a rock-solid idle.
• Corrosion-Resistant Build: Constructed from high-grade alloy designed to resist the gumming and corrosion associated with modern ethanol-blended fuels.