You-All 18mm CVK PD18J Carburetor | 139QMB Ruckus

Eliminate hesitation and restore consistent power to your 50cc scooter with the You-All 18mm CVK PD18J carburetor — our #1 selling carburetor. Larger venturi with a mechanical accelerator pump for crisp throttle response and a stable idle on daily commuters and performance builds alike.

• Model: PD18J (CVK type)
• Intake bore: 18mm
• Air filter mount OD: 40mm
• Main jet: #81
• Idle jet: #33

Compatible Models (139QMB / GY6 50cc):

• Chicago Scooter Co.: go., go. Max, Bella 50, Nitro Sport
• Wolf Brand: RX-50, Islander, Rugby, Blaze, Lucky, Jet
• Lance: Cali Classic 50, Cabo 50, PCH 50
• Honda: Ruckus / Metropolitan (select 50cc carb models)
• All 139QMB / GY6-powered 50cc scooters, ATVs, and quads with PD18J carburetors

Mechanic's notes: After installation, ensure your throttle cable has a small amount of freeplay so the accelerator pump can fully reset between throttle inputs. 

Off-road use only. Not intended for use on public roads or land.

California Prop 65 Warning: www.p65warnings.ca.gov

• Mechanical accelerator pump eliminates bogging during rapid throttle transitions
• High-flow 18mm venturi for improved airflow and fuel atomization
• Black-top CVK dome for stable idle — no surging or stalling
• Pre-installed #81 main jet and #33 idle jet for immediate bolt-on performance
• Direct OEM replacement for 139QMB / GY6 50cc engines

Model: PD18J (CVK) | Bore: 18mm | Air Filter OD: 40mm | Main Jet: #81 | Idle Jet: #33 | SKU: 1300-1115

139QMB/GY6 50cc engines — Chicago Scooter Co. go./go. Max/Bella, Wolf RX-50/Islander/Blaze, Lance Cali Classic/Cabo/PCH 50, Honda Ruckus/Metropolitan (carb), and all QMB/FM 50cc scooters and ATVs