By far the steepest learning curve for a nitro rookie is learning how to tune a carburetor. It can be awkward at first, but with a little effort, you’ll get it and never forget how to do it. Before we start adjusting needle valves, let’s consider the role of the carburetor and how it works. Properly tuning a carb is much easier once you understand how it functions.

HOW CARB TYPES REGULATE AIR/FUEL MIXTURE

A rotary carb contains a horizontal “barrel” that has a vertical hole drilled through it. As the barrel is rotated from the open position (the hole in the ...