Here's my H carb adjustment procedure, after I reviewed several different manuals. Make sure the float isn�t sticking or touching the insides of the float chamber. Some previous advice was to use a Dremel tool and smooth the insides of the float chamber so the float doesn�t rub or touch. Pretty important. Set the float so the top of it rests 1 27/32" above the flat surface of the float chamber. [Note a new float might already be set correctly.]
INITIAL settings are as follows to get the engine started; Main fuel adjusting screw; big screw facing down at an angle, towards the rear, at the bottom of the carb; 2 1/2 to 3 turns open. This main screw turns clock-wise for leaner mixture. [This screw adjusts fuel.] Idle-air-mixture screw; smaller screw facing forwards, on upper left-hand side of carb; 1 to 1 1/2 turns open. This idle screw turns counter-clockwise for leaner. [This screw adjusts air.] Idle speed screw; faces outboard, at the top of the carb; set for 450 rpm, and make sure the governor correctly engages in the slot. [This screw adjusts RPM�s.]
FINAL settings are as follows; Get the engine warmed up, and idling. Turn OUT the small idle-air-mixture screw until rough running, then turn in until engine idles smooth. (Mine is set at 1 turn open.) Rev it up, wide open, warmed up, then turn the big main fuel adjusting screw IN until rough, then out til smooth, then 1/4 turn to 1/2 turn further out. (Mine is set at 1 turn open. Other advice has been to set it at 2 1/2 turns open for pulling implements.)
Engine should rev up smoothly and evenly. Too Lean = stumble, sputter, damaged melted plugs. Correct = tan plugs. Too Rich = back smoke, black sooty plugs.
The other thing is, replace the distributor cap and rotor. If the center electrode is worn too much, she will not start. Use the brass-contact cap, not the cheap aluminum one.
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Today's Featured Article - Trailering Your Tractor - by Curtis Von Fange. One of the fun things of summer and fall are the parades and tractor shows that go on across America. Many owners of tractors travel long distances to attend these shows and they usually take their restored iron along with them. Safe trailering practices and inspections will ensure that the event is a fun one. A good habit to develop when using a trailer is to give that �quick look over� before taking it on a trip. Before hooking up to it check the tongue for proper operation. The latche
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