The check valve in the gasoline supply pipe between gasoline tank and mixer is intended to hold the gasoline back when the throttle valve is open and the engine is not drawing in a charge. Should some foreign substance get In the seat of this valve, it will be necessary to remove and clean it. Be sure, when supply pipe is again connected, that check valve has not been put on backwards, in other words reversed. While the engine is running, open throttle or needle valve in the gasoline mixer until the engine starts to miss explosions or shows other signs of weakness, and notice the number on the dial near the wire indicator. Now close the throttle until the engine starts to miss explosions and notice the number on the dial.
Black smoke coming out of exhaust pipe indicates too much gasoline.
Missing, followed by a sharp explosion, indicates not enough gasoline. If a slight change of speed is desired, regulate the adjusting screw which passes through the governor lever, turning it IN to increase the speed, and turning it OUT for slower speed. Turning UP the eye-bolts attached to the governor balls will give additional speed, and unscrewing these bolts will give less speed. Attached to governor lever and side bar will be f ound two sharp-edged steel plates, through the proper working of which the governor balls regulate the power and speed of the engine. When broken or worn, these blades should be replaced.