Cvk Main Jet (# 128) for Scooters & Mopeds
ITEM# TT-26422
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Description
Main Jet #128 for 139QMB and GY6 Scooters and Mopeds
This #128 main jet is built for scooters and mopeds that use the 139QMB and GY6 engine families. It fits most CVK carburetors that have a 5mm main jet slot. As with other items in our scooter carburetors & jets range, getting the best results often takes some experimentation when tuning the jetting. Detailed jetting guides are available if you want step-by-step help with the process.
Compatibility Information
This jet works with engines anywhere from 50cc to 169cc, so it suits a broad selection of scooter models. If your engine's identification number contains "QM" or "FM" and your carburetor uses a 5mm slot CVK, this jet will likely match your setup.
Construction Details
The jet uses a Keihin round-style body that delivers a steady fuel flow for better engine output. It has an M5x0.80 thread and an overall length of 8mm, so it seats accurately in the carburetor and helps with efficiency and throttle response.
Specifications
- Size: 8mm Length
- Thread Size: M5x0.80
- Fits: 139QMB-based 50cc/80cc GY6 engines and 157QMJ-based 125cc/150cc/169cc engines with a 5mm main jet slot CVK
Fitment
Fits:
- 139QMA, 139QMB, 1P39QMB, 1P39QMA-2, YN139QMB, JJ1P39QMB, 139FMA-2, BD1P39QMB, BN139QMB, 147QMD engines (50cc/80cc)
- Other QMA and QMB engines (50cc/80cc)
- 157QMJ, 161QMK, 152QMI, 1P61QMK, YN1P57QMJ, 1P52FMI, 154FMI, JJ157QMJ, 1P57QMJ, BN157QMJ, BN161QMK-A engines (125cc/150cc/169cc)
- Other QMJ, QMK and QMI engines (125cc/150cc/169cc)
How to choose: Pick this jet if your carburetor has a 5mm main jet slot and an M5x0.80 thread, and your engine code matches an entry in the list above.
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