think the b44.1 mount is different to what i have on a b44 but 24/81 goes straight on no problems, only have to dremel the mount to fit much smaller pinions on, much easier to change to a bigger spur though. some brushless motors really benefit from being geared quite hard while others like higher gear ratio's allowing them to rev. i know my x12 is slightly overgeared, but it smoothes the car out a lot by doing so. the speed passion 8.5 i use in my 2wd has to be geared much harder than it really should be to perform well, again with low timing, have had hobbywing motors in the past that needed the same treatment. ignore the batteries for now as the gens ace perform well for their price, and try gearing up a couple of teeth, turn down the timing on the speed control, run it and check the temperatures. if temperatures are sensible bring the timing up a little bit and try again.
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