Ask Husted about it. I'm sure he'll tell you to advance them.
FYI, here's the difference in motor speed (unloaded) at 12v from adjusting brush timing:
Quote:
Well, we tested the motor today in both directions. With the field connections reversed (compared to "stock"), the motor turns much more slowly: 1480 RPM @ 12 volts, vs. 2275 RPM.
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( From this part of the ForkenSwift thread:
http://ecomodder.com/forum/hreshowth...3-post531.html )
I think you'll get more top end out of it with the timing advanced. But your burnouts won't be as spectacular :P)