Cvk Main Jet (# 145) for Scooters & Mopeds
ITEM# TT-26414
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Description
Cvk Main Jet #145 for GY6 and 139QMB Scooters
The Cvk Main Jet (#145) is made for 139QMB and GY6 scooters and mopeds, and it fits carburetors that take a 5mm main jet. It helps fine-tune your scooter's fuel system and can contribute to better engine performance. You'll find it among other scooter carburetors & jets that affect engine efficiency. Getting the jetting just right often takes some testing, so it pays to be patient while tuning.
Build and Fit Details
This main jet uses a Keihin round design and has an M5x0.80 thread. Its overall length is 8mm, so it works with a broad range of engines. If your engine code includes "QM" or "FM" and your carburetor is set up for a 5mm main jet, this part will most likely suit your setup.
Signs It May Be Time to Swap the Main Jet
Think about replacing the main jet if the engine behaves unpredictably, for example by accelerating slowly or idling unevenly. Changing the jetting can noticeably alter the fuel-air ratio, which may improve throttle response and efficiency. For guidance on finding the best setting for your needs, refer to jetting instructions.
Specifications
- Material: Keihin round design
- Thread Size: M5x0.80
- Overall Length: 8mm
- Fits: 139QMB-based 50cc/80cc GY6 engines and 157QMJ-based 125cc/150cc/169cc engines with a 5mm main jet slot CVK
Compatibility
Fits:
- 139QMB-based 50cc/80cc engines (engine codes 139QMA, 139QMB, 1P39QMB, 1P39QMA-2, YN139QMB, JJ1P39QMB, 139FMA-2, BD1P39QMB, BN139QMB, 147QMD, other QMA and QMB models)
- 157QMJ-based 125cc/150cc/169cc engines (engine codes 157QMJ, 161QMK, 152QMI, 1P61QMK, YN1P57QMJ, 1P52FMI, 154FMI, JJ157QMJ, 1P57QMJ, BN157QMJ, BN161QMK-A, other QMJ, QMK and QMI models)
- Any engine with engine code containing QM or FM and a 5mm main jet slot CVK carburetor
How to choose: Find your engine code in the list above and confirm your carburetor has a 5mm main jet slot. This jet has an M5x0.80 thread and an 8mm overall length.
Shop more: Scooter Carburetors & Jets · Scooter Parts
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