Carburetor Primer: Which way does the throttle rotate and how does one install the ball and swivel linakage?
The carburetors that are supplied with model airplane gas engines are of a generic nature and are not custom made for use on a model airplane engine. There are as many ways to connect the throttle lever to a servo as there are modelers! We present some general thoughts to aid the installation of your engine in your model. The carburetors generally have a method for setting the idle speed that would prevent using a servo to “kill” the engine (completely closing the throttle) So the first item to do is to remove the mechanism that provides for the idle setting. Please note that removing the idle setting device sometimes allows the throttle butterfly to freely rotate 360 degrees (depending on the carburetor design. So prior to modifying the idle stop it is best to mark the shaft and car body so it is clear where the closed position is. It is also important to note, that the butterfly can be positioned 180 degrees out from where it should be, the engine will run with the throttle butterfly
