IMHO there 's just three things to look at.
TOPSPEED=bigger pinion and/or smaller spur
ACCELERATION=smaller pinion and/or bigger spur
TEMP=THE MOST IMPORTANT SO MEASURE MEASURE MEASURE!!!
Start with the recommend gearratio and check the temp after 2min then 4min and 6min (so you can avoid cooking speedo/motor).
TEMP= OK? Then go can up a tooth and recheck and repeat if possible.
TEMP TOO HIGH? Almost always go down a tooth (but it isn't always true) and repeat if necessary.
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