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According to what I've read, 20-25° is the most advance you would normally want. Too much advance causes overheating due to very high current draw. Putting my protractor on the screen shows that I am getting 15-18° of advance by twisting the commutator. Unfortunately, it is a bit more difficult to do it this way with as much precision as the 540 motors give with their adjustable endbells.
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-- It is by will alone I set my mind in motion...
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