Most times a timing light is not to successful in setting the time at idle on those tractors. Unless the advance springs are in good condition and you get the idle down to 400 RPM or less. After you get the distributor in the correct index and the tractor is for work. Looking at the crank pulley from the front, find the TDC notch. Go clockwise and mark the pulley 1-11/32 inches from the TDC notch. Use the timing light and set to that mark with the engine running full throttle. If the initial engine stopped timing is off after that or no smooth timing change from low to high RPM the distributor has the wrong advance or bad advance parts. If the engine already had higher compression pistons before the head change that makes it more important to know the total timing. Your engine came with a 30 degree total advance. With higher compression and max loads you want around 22 to 25 degrees total advance. Unless you run a higher octane fuel. Think you need a operators manual to get the basics about timing the distributor to engine.
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