Prima compatible with PB Main Jet Kit (4mm, 10 pcs); QMB139, Gen 50cc

This Prima PB CVK Main Jet Kit fits Genuine 50cc scooters and other GY6 50cc engines with CVK-style carbs noted below.
Specifications:
Round, Keihin PB style jets
Kit contains 10 different jet sizes: 70, 75, 80, 85, 90, 95, 100, 105, 110, and 115
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:
Genuine Buddy 50
Genuine Roughhouse 50
Genuine Rattler 50
Genuine Black Cat 50
Chicago Scooter Co. go. 50
Chicago Scooter Co. go. Max 50
Chicago Scooter Co. Nitro 50
Chicago Scooter Co. Bella 50
Keihin 50cc carburetors
50cc CVK Style Carburetors
PD18J Carburetors
And many other PB and CVK-style carburetors
Jetting takes trial and error to obtain optimal performance from your scooter. Many scooters are jetted lean from the factory to meet emissions requirements. Learn more on our Carburetor Jetting 101 page. Additionally, 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 is the industry leader in premium scooter accessories, service parts and scooterist protective apparel. Prima brand products are designed direct-fit for all popular scooter brands including Compatible with Honda, Compatible with Yamaha, Genuine, Vespa, SYM, Lance, KYMCO, Royal Alloy and GY6 / QMB powered scooters. Made in Taiwan. This product is intended for off-road use only.This product is not intended for use on public roads or land.This product is not legal for use in California on pollution-controlled vehicles. Check local laws before installing.*Performance upgrades are considered racing parts and are not covered by warranty.WARNING: California’s Proposition 65