Kingston;
The first item you need to look at is the valve adjustments hot. You should have 0.015 inches on both intake and exhaust. Item two is to set the timing of the engine to 12 degrees before top dead center with the engine's speed at 650-700 RPM. Next item is to purge the fuel system of all LPG by turning off the fuel at the tank and run the engine until it dies. When this is done go to the rear of the vaporizer-regulator and remove the 1/8 inch pipe plug and install a 10 lb pressure guage in it's place. On the bottom side of the regulator is a 5/8 plug that needs to be replaced with a manometer. When this is done turn the idle mixture screw out 3 to 3 1/2 turns and open up the fuel valve on the tank. Turn the engine over with the key while looking at the guage pressure at the regulator. You should be seeing 1 1/2 lbs plus or minus 0.5 lbs. If the fuel pressure is at the 1 1/2 run your engine till it reaches operating temperature. When the engine's operating temperature is reached put the engine at maximum governored speed full load and adjust the Power Mixture Adjustment screw to the leanest side until the engines speed starts to drop off. When this point is reached ever so slightly return it toward the "R". With all of these steps taken look at the monometer and you should be seeing 6 inches at idle and 13.8 inches water column at full throttle. Now install your air gas analysier into the exhaust and adjust idle air mixture for a 15:1 mixture. When this is completed high speed/ full power carbon monoxide reading should be 0.2% and at idle speed it should be at 0.5%.