The governor controls the speed of the engine and is of the hit and miss fly ball type. When the engine runs above its regular speed, the balls on the governor widen their circuit, which presses in on the pin going through the governor spindle. This forces the detent blade in so that it catches behind the block on the cam rod and holds the exhaust valve open, at the same time stopping the spark and cutting off the supply of gasoline, until the speed of the engine is reduced to where it should be, then the detent blade flies out again, releasing the cam rod and the engine takes up its regular operations.

Always keep the speed lever set in the notch to the right as this runs the engine at its regular speed where it will give its full power. If you reduce the speed of the engine you also reduce the power it will develop. Never slow the engine down on a heavy load if you want less speed, for heavy work get a smaller pulley for the engine as the reduction in speed is only to take care of light slow speed machines. (See rules for determining the size of pulleys to use on page 2.) If you set the speed lever in the center notch it gives a reduction in speed of from 50 to 60 R. P. M. and the notch to the left a reduction of from 100 to 125 R. P. M.

HOW TO ADJUST THE DETENT BLADE.

When the exhaust valve is wide open and the detent blade is pushed in behind the catch block on the cam rod, there should be only the thickness of a postal card between them. And when free it will just pass by the catch block, about 1/16 of an inch between them. If the blade is bent away from the block any farther than this the engine will run too fast.

To adjust the detent blade loosen the locknut "A" and screw the adjusting screw "B," either in or out, until you have the blade where it should be, then tighten the locknut.

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