As default, I would always mark the can from the original settings it came with. I never really used to play around with the timing of motors who had a reputation of churning out good motors and I bought as new.
Only time I played with the timing is when they were cheap motors - good enough for club racing, which were new But weren't run through a professional dyno. Also when I buy a used one from one of the sponsored driver who had the motor for 2/3 meetings from new, never been skimmed. I would connect it to a pack of batteries and adjust the timing for max rpm by ear/listening to the revs and back off 2 degrees. I used to do this a lot for old motors which didn't have great magnets due to their use & age, I figured, you weren't going to get punch or torque but you could get better top end (to a degree).
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