Prima Keihin PB Main Jet Kit (4mm, 10 pcs); 139QMB, Gen 50cc

Prima PB CVK Main Jet Kit for 50cc Scooters.

Jet kit contains 10 different jet sizes 70, 75, 80, 85, 90, 95, 100, 105, 110, and 115.

These are round Keihin PB Style jets found in popular 50cc 18mm carburetors from Keihin and in many CVK Style carburetors found on 139QMB / GY50-based motors.  

Specifications: 

• Overall Length: 7mm
  
• Jet Body Diameter: 5mm
• Jet Thread Size: M4 x 0.7mm fits 4mm main jet ports.
• 70 Main Jet Inner diameter: 0.70mm (70) 
  
• 75 Main Jet Inner diameter: 0.75mm (75) 
• 80 Main Jet Inner diameter: 0.80mm (80) 
• 85 Main Jet Inner diameter: 0.85mm (85) 
• 90 Main Jet Inner diameter: 0.90mm (90) 
• 95 Main Jet Inner diameter: 0.95mm (95) 
• 100 Main Jet Inner diameter: 1.00mm (100) 
• 105 Main Jet Inner diameter: 1.05mm (105) 
• 110 Main Jet Inner diameter: 1.10mm (110) 
• 115 Main Jet Inner diameter: 1.15mm (115) 

Compatibility:

Jetting takes trial and error to obtain optimal performance from your scooter.  Many scooters are jetted lean from the factory to meet emissions requirements.  There are many good tutorials on how to properly jet a carburetor and you should refer to them to ensure you do not damage your engine by jetting too lean.

About Prima:  Prima stands at the forefront of stylish, and reliable scooter accessories, service components, and protective gear for scooter enthusiasts. Products under the Prima brand are specifically engineered to fit seamlessly and color-match when appropriate with a wide range of well-known scooter manufacturers, such as Honda, Yamaha, Genuine, Vespa, SYM, Lance, KYMCO, Royal Alloy, and GY6/QMB powered scooters.  Since its inception in 2006, Prima has consistently offered exceptional style, function, performance, and protection for both scooters and scooterists alike. 

Made in Taiwan.

Not intended for use on public roads or land

WARNING: California’s Proposition 65

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