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You know where the spark needs to occur - get your head straight and get it right.  If there is an auto advance, lock it on full advance - set the timing and then remove the lock.  It does not matter if the auto advance is worn to buggery or the chains or cam gears are worn - all you need to do is make sure all the slack is taken up, so the spark happens at the right time when the motor is revving above idle.