GY6 50cc (139QMB) CVK Main Jet Kit - 72 to 110

CVK Main Jet Kit for 50cc QMB139 Engines

This CVK main jet kit is built for 50cc four-stroke QMB139 carburetors, a practical option for scooter owners. It covers jet sizes from #72 to #110, giving you room to tune for different conditions. Among GY6 50cc scooter parts, it is a straightforward way to adjust fuel delivery for a smoother ride and better efficiency. You can pick a 10-piece or 50-piece set, depending on how often you plan to do maintenance.

Jet Size Options

The kit includes #72, #75, #78, #80, #85, #90, #95, #100, #105, and #110. The 10-piece set contains one jet of each size, while the 50-piece set contains five of each. The larger set gives you more spares for testing different setups, and the full range makes it simpler to find the jet that suits your engine.

Installation and Compatibility

Each jet has an M4x0.70 thread and an overall length of 7.2mm, so it should seat properly in your carburetor. When tuning, swapping jets can help restore performance and fuel efficiency. If you are seeing performance problems or making major modifications, changing the main jet is a sensible part of the tuning process.

Specifications

• Size Range: #72 to #110
• Thread Size: M4x0.70
• Overall Length: 7.2mm
• Available Sets: 10 Piece or 50 Piece
• Fits: QMB139 50cc 4-stroke CVK (Keihin round style) carburetors; Honda Dio and Honda Elite 50

Fitment

Compatible with:

• Honda Dio (QMB139 50cc 4-stroke CVK carburetor)
• Honda Elite 50 (QMB139 50cc 4-stroke CVK carburetor)
• QMB139 50cc/49cc (4-stroke, CVK carburetor)
• Other makes/models not listed here that use the QMB139 CVK carburetor

How to choose: This kit suits a QMB139 CVK carburetor with a Keihin round style main jet. Select the size your engine requires, from #72 to #110.

Shop more: GY6 50cc Scooter Parts (139QMB) · GY6 Scooter Parts · Scooter Carburetors & Jets · Scooter Parts