What It Does: A Motorcycle carburetor

Motorcycle Carburetors:

When people talk about jetting a Motorcycle carburetor and tuning a Motorcycle carburetor , they’re talking about manipulating the carburetor’s 4 main circuits to optimize gasoline delivery and therefore engine performance.

Dirt Bike Carburetor

Dirt Bike Carburetor

Most motorcycle carburetor circuits are governed by throttle position and not by engine speed. They might adjust the air screw, adjust the jet needle’s clip position or exchanging the pilot (slow) jet, main jet, throttle valve (slide) or jet needle for one of an appropriate size. A perfectly tuned 2-stroke engine/carburetor delivers a 12.5 to 1 air to fuel ratio.

If you look at a Motorcycle carburetor, you will notice a rather large hole going from one side to the other. This is called a Venturi. Air passes into the engine through this hole (Venturi).







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