5mm CVK Scooter Carburetor Main Jet Kit - 10 Pieces

5mm Main Jet Set for GY6 and CN250 CVK Carburetors

This set of 5mm main jets suits GY6 and CN250 CVK carburetors and comes in ten sizes: #100, #105, #108, #110, #113, #115, #120, #125, #130, and #140. Getting the jetting right matters because it directly shapes how fuel is delivered and how efficiently the engine runs. The set is one of the key parts for adjusting scooter carburetors & jets. For more detail on choosing sizes, check the jetting guides we have available.

Build Quality

These jets follow the Keihin round design, which gives a dependable fit and operation. Each one is precision made so fuel flow can be adjusted accurately. Thread size is M5x0.80 and every jet is 8mm long, so installation into a compatible carburetor is straightforward.

Signs It's Time for New Jets

New main jets are needed when you alter the engine or when the bike starts running poorly. Modifications to the intake, exhaust, or other performance parts can call for a different jet size to keep the engine running smoothly and efficiently. It's worth checking how your scooter performs from time to time to see whether a jet change is due.

Specifications

• Thread Size: M5x0.80
• Overall Length: 8mm
• Jet Sizes: #100, #105, #108, #110, #113, #115, #120, #125, #130, #140
• Fits: GY6 and CN250 scooters with 157QMJ-based 125cc, 150cc and 169cc engines running a 5mm CVK carburetor

Fitment

Fits:

• 157QMJ-based 125cc / 150cc / 169cc engines (CVK carburetor)
• Engine codes: 157QMJ, 161QMK, 152QMI, 1P61QMK, YN1P57QMJ, 1P52FMI, 154FMI, JJ157QMJ, 1P57QMJ, BN157QMJ, BN161QMK-A
• Other QMJ, QMK and QMI engines (CVK carburetor)
• Engine codes with "QM" or "FM" (CVK carburetor)

How to choose: Pick the jet size by tuning your engine. The set contains #100, #105, #108, #110, #113, #115, #120, #125, #130 and #140.

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