Cvk Pilot Jet (# 39) for Scooters & Mopeds

CVK Pilot Jet for Buddy Scooters and GY6 Engines

This #39 pilot jet suits Genuine Buddy 125 and 150 scooters, along with a range of 139QMB and GY6 motorcycles that use CVK or PWK carburetors. It controls fuel delivery at low throttle, so it has a strong influence on how the engine runs. Many riders swap it out to improve fuel economy and throttle response, and it is one of the key scooter carburetors & jets items in this category.

Build and Fit

This pilot jet uses a Keihin round design, which is meant to seat correctly in compatible carburetors. People usually change it while tuning or servicing the carburetor, particularly when the jetting needs adjusting. Knowing what your engine needs is the first step toward getting it running well.

Setup Tips

Getting the jetting right often takes a few attempts, so look to trusted guides before making changes. The pilot jet has an M6x0.75 thread and measures 28mm overall, so it should go into your carburetor without much hassle.

Specifications

• Type: Pilot Jet
• Thread Size: M6x0.75
• Overall Length: 28mm
• Fits: Buddy 125/150 scooters and GY6-style 50cc to 169cc engines with CVK or PWK carburetors

Compatibility

Compatible with:

• Buddy 125/150 (CVK or PWK carburetor)
• 139QMB-based 50cc/80cc engines: 139QMA, 139QMB, 1P39QMB, 1P39QMA-2, YN139QMB, JJ1P39QMB, 139FMA-2, BD1P39QMB, BN139QMB, 147QMD, other QMA and QMB models
• 157QMJ-based 125cc/150cc/169cc engines: 157QMJ, 161QMK, 152QMI, 1P61QMK, YN1P57QMJ, 1P52FMI, 154FMI, JJ157QMJ, 1P57QMJ, BN157QMJ, BN161QMK-A, other QMJ, QMK and QMI models

Choosing the right one: Check your engine code against the list above. Any code containing QM or FM will work if your setup uses a CVK or PWK carburetor. Expect some trial and error when tuning the jet.

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