I give a thumbs up to the tractor vet's answer, but have a few comments to add.
First off, the H should have an "A" symbol distributor (stamped into the distributor's flange). Other distributors will have a different advance curve.
I static time at 0 degrees. An early Owner's Manual will only have the procedure for a magneto. The procedure for a distributor is the same except for 2 details:
- rotate the distributor the opposite direction to advance the timing.
- there is no audible click, connect an ohmmeter to the points or turn the switch on and watch for a spark.
Once you have it static timed, use your timing light to verify proper advance. If you have the right distributor, the advance starts at about 400 RPM, so at idle you may see just a little advance. It should hit 19 at 800, 34 at 1,200 and finally reach 40 degrees at 1,600. If it doesn't come pretty close to those figures, either you have the wrong distributor or it isn't working right. Just checking for full advance at high speed is usually enough of a check.
If you do it "by ear" you won't have any idea whether it is working or not.
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