Stalling under load is almost always either weak spark or fuel starved. Best to have everything ready to quickly catch it in the act when it fails.
Start with the ignition system. If any doubt about the plugs, replace them just to say you did.
You should get a blue hot 1/4 inch spark to ground at the plug end of each wire.
Check the points gap and condition, check the distributor shaft for side play. It must be tight or the points will not stay set.
Feel the coil, it should not be uncomfortably hot to touch after a few minutes running. If it is, it may be failing or has the wrong coil, or coil/resistor combination.
Next move to the fuel system.
Be sure the air cleaner is serviced and flowing freely.
Be sure the choke is fully operational.
Be sure the governor is functioning. With the engine off, dash lever set to fast, the throttle on the carb should be wide open.
Check the gas cap, be sure it is vented. Even if it says vented, try loosening it just to see if it is not holding vacuum.
There is a drain plug in the bottom of the carb. Have a clean glass ready, engine off, fuel tank valve open, (engine idling if there is a fuel pump). Remove the plug and catch the flow in the glass. There should be a continuous flow, not slow to a drip or stop. Look at what is caught. If there is water, excessive grit, rust flakes, the tank and carb are contaminated and will need to be removed and cleaned. There should be a screen inside the tank, a screen in the sediment bowl, and a screen in the carb inlet elbow. Be sure these are clean and accounted for. Adding an inline filter may cause flow problems with a gravity system.
If there is a fuel pump, route the discharge side to a container, crank the engine, it should give a strong positive pulsed flow at about 2 PSI.
Check these things first, see what you find. Let us know...
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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