Product Details
Description
Main Jet for Keihin Style PB, PAB and CVK Carburetors- 4mm is a variable product with selectable options. Choose the correct option before adding to cart.
Product Details
This 4mm main jet works with Genuine, Piaggio, PGO, Yamaha, Honda and SYM scooters, and 139QMB and GY6 bikes running Keihin PB, PAB, NCV, CVK 17, 20, 22, 24, 26mm carburetors. For example, the Buddy 50 takes a #74 stock jet and the Buddy 125 takes a #90 stock. Jetting is something that takes trial and error. Original Parts For Scooters SKUs 114-36-75, 114-36-80, 114-36-85, 114-36-95, 114-36-100, 114-36-105, 114-36-110, 114-36-120, 114-36-125 Specifications: Keihin Round Style Main Jet Thread Size: M4x0.70 Overall Length: 7mm Available in sizes #75 - #130 NOTE: Before ordering, confirm the type of carb you use to ensure this product works with your ride. Compatibility: Genuine scooter modelsPiaggio scooter modelsPGO scooter modelsYamaha scooter modelsHonda scooter modelsSYM scooter models139QMB-based 50cc / 80cc engines with the following engine codes:139QMA139QMB1P39QMB1P39QMA-2YN139QMBJJ1P39QMB139FMA-2BD1P39QMBBN139QMB147QMDOther QMA modelsOther QMB models157QMJ-based 125cc / 150cc / 169cc engines with the following engine codes:157QMJ161QMK152QMI1P61QMKYN1P57QMJ1P52FMI154FMIJJ157QMJ1P57QMJBN157QMJBN161QMK-AOther QMJ, QMK, and QMI modelsDon't see your engine listed? If the engine code includes "QM" or "FM" and you're running a Keihin style carb, this product is compatible with your vehicle. About ScootsUSA: Since our beginning in 1989, ScootsUSA has become a major supplier of parts and accessories for vintage and modern scooters. We have everything you need, from wear-and-tear items like tires and oil filters to after-market parts from brands like Malossi, NCY, Prima, YSS, Dr. Pulley, and more.
Ordering Notes
Use the dropdown options on this product page to select the correct version, color, size, or fitment before ordering.
Additional information
| Weight | N/A |
|---|---|
| Dimensions | N/A |
| Size | 100, 102, 105, 110, 115, 120, 125, 128, 130, 75, 80, 85, 90, 95, 98 |
Compatibility / Fitment
Use the fitment details below to confirm this part matches your scooter before ordering.
- Engine Size: 50cc, 80cc, 125cc, 150cc, GY6, PGO
- Engine Code: 139QMB
- Fits Models / Common Applications: Genuine Buddy, Honda, Piaggio, SYM, and Yamaha and other compatible models may apply.
- Fitment Notes: Auto Transmission
Fitment Guide: This compatibility information is based on manufacturer and supplier data. Listed models are common known applications and may not include every compatible scooter. If your scooter has multiple versions or production changes, confirm the correct match before ordering. Check photos, measurements, original part numbers, engine code, model, and related fitment information whenever possible.
Common Fitment Questions
Q: Will this fit a 139QMB engine?
A: This SKU is listed as compatible with 139QMB engine-code fitment. Always compare your original part and scooter details before ordering.
Q: Will this fit a Genuine?
A: This SKU is listed with Genuine model fitment where the scooter also matches the listed engine or fitment notes.
Q: Is this for 50cc scooters?
A: This SKU is listed with 50cc engine-size fitment. Confirm exact model, year, and part style before ordering.
Additional information
| Weight | N/A |
|---|---|
| Dimensions | N/A |
| Size | 100, 102, 105, 110, 115, 120, 125, 128, 130, 75, 80, 85, 90, 95, 98 |




