This 18mm CVK replacement carburetor fits all 139QMB powered 50cc scooters, including Chicago Scooter Co. (CSC), Honda Ruckus, and nearly every 50cc bike on the planet. This is THE go-to carburetor for any 50cc scooter and our #1 seller for good reason. .

Benefits:

1. A larger than stock venturi increases flow and fuel atomization.
2. A mechanical float-bowl accelerator pump helps prevent bogging and hesitation when accelerating quickly.
3. The black-top CVK dome and improved idle circuit deliver superior engine idle to prevent unstable idle surging and stalling found on many OEM 50cc carburetors.

Specifications:

• Brand: You-All
• Model: PD18J
• Type: CVK with Accelerator Pump
• Intake Bore: 18mm
• Outlet OD: 40mm
• Main Jet Size: 81 
• Idle Jet Size: 33

Compatibility:

This part is also compatible with scooters and ATVs with 139QMB-based 50cc / 80cc engines with the following engine codes:

Don't see your engine listed? If the engine code includes "QM" or "FM" this part is compatible with your vehicle.

This product is intended for off-road use only.

This product is not intended for use on public roads or land.

This product is not legal for use in California on pollution-controlled vehicles. Check local laws before installing.

*Performance upgrades are considered racing parts and are not covered by warranty.