that would depend on which fets your board has.
if it has the old 3004 fets i wouldn't go much higher than stock.
the 3010 fets can take a little more. not sure on the number of winds it can take that would depend on the motor in question, there are other factors besides winds that determine how may amps a motor will draw such as timing,brushes,magnets,com,armature, ect.
i run a pn speedy 07 with my 3010 fet car and i wouldn't go much hotter than that.
you can get some data on the fets here:
http://www.mini-z-guide.com/mosfet.htm
hope that helps.