Cvk Main Jet (# 105) for Scooters & Mopeds
ITEM# TT-26580
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Description
Cvk Main Jet (#105) for 139QMB and GY6 Scooters
The Cvk Main Jet (#105) is built for 139QMB and GY6 engines, so it suits scooter and moped owners. It fits most CVK carburetors that have a 5mm main jet opening, which means it works with a broad range of vehicles. It is listed among our scooter carburetors & jets. Because it controls how much fuel passes through, it helps shape how the engine runs. It is a practical option for riders who want to get more out of their scooter.
Compatibility Overview
This main jet works with several engine codes across both 50cc and 125cc-169cc scooters. It is suited to engines based on the 139QMB and 157QMJ designs, so it can be used in more than one setup. If your engine code contains "QM" or "FM" and your carburetor is a CVK with a 5mm jet opening, this jet should be a good match for your scooter.
When a Main Jet Replacement Makes Sense
You may need to replace the main jet if the engine is running poorly or if you are modifying the scooter to run more efficiently. Changes in altitude, exhaust systems, and air filters can all affect how the jetting performs. Checking and adjusting the jetting on a regular basis helps keep the fuel mixture and engine running as they should.
Specifications
- Type: Keihin round-style main jet
- Thread Size: M5x0.80
- Overall Length: 8mm
- Fits: 139QMB-based 50cc/80cc 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: Find your engine code in the list above, then confirm the carburetor has a 5mm main jet slot. The jet must have an M5x0.80 thread and an overall length of 8mm.
Shop more: Scooter Carburetors & Jets · Scooter Parts
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