139QMB Carburetor for GY6 50CC 49CC 4 Stroke Scooter 18mm Intake Manifold ATV

139QMB Carburetor for GY6 50CC 49CC 4 Stroke Scooter

The 139QMB carburetor for GY6 50CC 49CC 4 stroke scooter engines delivers the air and fuel mix your engine needs, and this 18mm intake manifold carburetor assembly replaces a worn or clogged unit to restore reliable starting and smooth throttle response.

Overview

This 139QMB carburetor for GY6 50CC 49CC scooter applications is a complete carburetor and intake manifold setup built for 4 stroke engines. It meters fuel and air into the combustion chamber so the engine idles steadily, accelerates cleanly, and holds speed under load. This 18mm intake manifold carburetor suits riders and mechanics servicing scooters and ATVs with GY6 based 50CC and 49CC power plants.

Built For Performance

• 18mm intake manifold bore sized for GY6 50CC and 49CC 4 stroke engines
• Complete carburetor and manifold assembly for a direct replacement install
• Precision metering circuits support steady idle and clean throttle response
• Cast body construction resists heat and vibration in daily scooter use
• Manual choke and idle adjustment points for easy tuning

Fits These Machines

• for GY6 50CC 4 stroke scooters
• for GY6 49CC 4 stroke scooters
• for GY6 50CC ATVs
• for 139QMB equipped machines

On-The-Job Use

• Daily commuting on 50CC scooters
• Restoring fuel delivery on a hard starting GY6 engine
• Replacing a clogged or leaking carburetor during routine service
• Replacing the intake manifold in the same job

Specs At A Glance

Good To Know

Q: Will this carburetor fit my scooter out of the box? A: It is built for GY6 50CC and 49CC 4 stroke engines with the 139QMB code and an 18mm intake, so check your engine code and manifold size first. Minor tuning of the idle screw may be needed after installation.

Q: Is the intake manifold included? A: Yes, this listing is for the carburetor with the 18mm intake manifold. Inspect the gasket surface and tighten fasteners evenly to avoid air leaks.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.