Cvk Pilot Jet (# 45) for Scooters & Mopeds

Cvk Pilot Jet (#45) for Buddy Scooters and GY6 Bikes

The Cvk Pilot Jet (#45) suits genuine Buddy scooters and a range of 139QMB and GY6 bikes that use CVK or PWK carburetors. This small part has a real effect on how your scooter's engine runs. It is one of the essential carburetor and jet options to look at when you are tuning your ride. Getting the jetting right often takes some trial and error, so consult the jetting guide for direction.

Build and Fit Range

This pilot jet uses a Keihin round design, which helps it seat reliably across many models. It works with both 50cc engines and 125cc to 169cc engines. If the engine code includes "QM" or "FM," this part should suit your vehicle, provided a CVK or PWK carburetor is fitted.

Signs It May Be Time to Swap It

You might need a new pilot jet if the scooter is running poorly or if you are adjusting the setup to improve fuel economy. A jet that is not working properly may cause weak acceleration or make the scooter hard to start. Checking it regularly can help keep your scooter running well.

Specifications

• Type: Keihin round-style main jet
• Thread Size: M6x0.75
• Overall Length: 28mm
• Fits: Buddy scooters and GY6 139QMB, 157QMJ-based engines running CVK or PWK carburetors

Fitment

Fits:

• Buddy scooters (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

How to choose: Find the engine code on your engine and compare it with the list above. Also confirm that your carburetor is a CVK or PWK. Expect to fine-tune the jetting through trial and error.

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