Your first objective is to get the engine running slowly with the throttle wide open. Start the engine with the throttle wide-open and the needle valve open just barely enough for the engine to run slowly. It will be a blubbering low-speed 4-stroke mode. Now screw-in the needle valve until the engine speeds-up. Keep doing this until you reach the point where the engine starts breaking into the high-speed 2 stroke mode. Stop adjusting the needle valve at this point. When the plane starts flying there will be less load on the engine and it will break into the 2 stroke mode. This is the adjustment you want it when it is in the air. On the ground you want the throttle wide open and the engine alternating between a slower blubbering speed and breaking into a higher speed scream. Now throttle back to idle. You are now ready for take off
Last edited by Lee Taylor; 08-12-2021 at 02:31 PM.