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Remove any automatic advance. Find the knee in the ignition curve. Use a degree wheel to determine what advance that is. Re install the automatic advance. Use the degree wheel to set the maximum advance to the advance you found at the knee.
Too much advance will destroy your rod bearings in short order.
To find the knee, retard the ignition then set the hand throttle to a fast idle, about 1,000 to 1,200 rpm. Then advance the ignition one click at a time until one more click will not make the engine run faster. Retard one click and that is the knee where your ignition should be running.