You-All
You-All CVK PD18J Carburetor w/ Accelerator Pump 4T 50cc
Description
Eliminate hesitation and restore consistent power to your 50cc scooter with the You-All 18mm CVK Carburetor (PD18J) — our #1 selling carburetor. Engineered to outperform standard OEM replacements, this unit combines a larger venturi with a mechanical accelerator pump for crisp throttle response and a rock-solid idle on daily commuters and performance builds alike.
Key Features
- Mechanical Accelerator Pump: Dedicated fuel-squirt circuit eliminates "bogging" and hesitation during rapid throttle transitions.
- High-Flow Venturi: Larger-than-stock venturi increases airflow and fuel atomization for improved power delivery.
- Black-Top CVK Dome: Improved idle circuit delivers a superior, stable idle — eliminating the surging and stalling common on OEM 50cc carburetors.
- Precision Jetting: Pre-installed with a #81 Main Jet and #33 Idle Jet, calibrated for immediate bolt-on performance on most 50cc–80cc engines.
Specifications
- Model: PD18J (CVK Type)
- Intake Bore: 18mm
- Air Filter Mount (OD): 40mm
- Main Jet: #81 | Idle Jet: #33
- Brand: You-All
Fitment Guide
Direct OEM replacement for 139QMB / GY6 50cc engines. Compatible with:
| Brand | Compatible Models |
|---|---|
| Chicago Scooter Co. | go., go. Max, Bella, 50, Nitro Sport |
| Wolf Brand Scooters | RX-50, Islander, Rugby, Blaze, Lucky, Jet |
| Lance Powersports | Cali Classic 50, Cabo 50, PCH 50 |
| Honda | Ruckus / Metropolitan (select 50cc carb models) |
| 139QMB / GY6 50cc | All 139QMB/GY6-powered 50cc scooters, ATVs, and quads with PD18J carburetors |
Tip: If your 4-Stroke 49/50cc engine code includes "QM" or "FM", this carburetor is compatible with your vehicle.
About You-All
You-All is a trusted OEM and aftermarket supplier specializing in GY6 and QMB139 engine components. Their carburetors are widely used by scooter dealers and enthusiasts across North America for reliable, cost-effective performance.
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. Before installing, fit a new fuel filter and drain old fuel from the tank to prevent jet clogging.
This product is intended for off-road use only and is not intended for use on public roads or land.
Product Diagrams
Features
Specifications
Model: PD18J (CVK) | Bore: 18mm | Air Filter OD: 40mm | Main Jet: #81 | Idle Jet: #33 | SKU: 1300-1115
Model Fitments
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
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Same day shipping for orders placed before 2PM (CST) M-F
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30-day return period on eligible items
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Flat-rate shipping for orders shipped to the 48 Contiguous United States.
