But if you know the theory and reasons for each circuit in your Mikuni, Keihin ... you typically have two jets. The pilot, the smaller of the two, and the main jet. Let’s start with the pilot.

Bob Yost has been making carburetor hop-up kits for more years than he likes to admit. His Power-Tubes are world-famous for their ability to wake up anemic carburetors. When Bob introduced the ...