Cvk Pilot Jet (# 42) for Scooters & Mopeds

CVK Pilot Jet (#42) for Genuine Buddy and GY6 Scooters

This #42 CVK pilot jet suits Genuine Buddy 125 and 150 scooters, plus several 139QMB and GY6 models that run CVK or PWK carburetors. Getting the pilot jet right matters for engine response and fuel economy. It sits among the carburetor and jet options we carry, and its job is to meter fuel accurately so the engine runs smoothly.

Build and Layout

This pilot jet uses a Keihin round-body style and has an M6x0.75 thread and an overall length of 28mm. It is matched to particular engine setups, so it works well for scooter owners who want a dependable part for a performance build. Jetting can take some trial and error, so check the jetting guide for the best setting.

Fitting and Tuning

Swapping the pilot jet can noticeably change how your carburetor performs. Test the scooter and make adjustments after fitting to get the best result. The jet goes into the same spot as the original, so it is a simple exchange for experienced mechanics and home mechanics alike.

Specifications

• Material: Keihin round-style
• Size: M6x0.75 thread
• Overall Length: 28mm
• Fits: Buddy 125/150 and GY6-style 50cc, 80cc, 125cc, 150cc and 169cc engines with CVK or PWK carburetors

Fitment

Fits:

• 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
• Any engine with a QM or FM engine code running a CVK or PWK carburetor

How to choose: Pick this jet if your carburetor is a CVK or PWK and your engine code includes QM or FM. Confirm the jet size listed for your engine before installing.

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