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

SKU 1300-1129
Shipping calculated at checkout.

Contains 70, 75, 80, 85, 90, 95, 100, 105, 110, 115 jets.

Jetting is something that takes trial and error. See our blog page of for more info.

Model Fitments

Genuine RH 50
Genuine Buddy 50
Genuine Buddy 125

  • Same day shipping for orders placed before 2PM (CST) M-F
  • 30-day return period
  • Flat-rate shipping for orders shipped to the 48 Contiguous United States.
Since 1989

Supplying parts and accessories for vintage and modern scooters since 1989 – Over Half a Million Served and Counting!

Comprehensive Resource

From wear-and-tear items like tires and oil filters to aftermarket parts from industry-leading brands.

Dealer Focused

With a committed team of dealer-focused sales reps and streamlined pricing and shipping processes, we are dedicated to supporting your business.


Our team constantly strives to develop and source the best new products for your scooter.