What kind of book do you have? It's no wonder you had problems. Even 10 is too much, because you have to remember there is around 26 degrees of mechanical advance in the distributor so if you set the base timing at 10 that would be 36 degrees total which is too much and 30 base plus 26 comes out to 56 which will blow the bottom end out of the block. Your trying to ignite the fuel when the piston is at the bottom of the stroke. Get a timing light and make sure the tractor is warmed up and idling at 400 rpms. Anymore than that and the distributor will start advancing the timing. Shine the timing light in the hole in the bell housing and set it to 6 degrees. That simple. Doesn't matter if it's electronic ignition or not.
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