I'm sorry I can't be more help on this as I race for Novak and have never had an issue with heat, but I have a friend who uses an LRP X12 6.5t in his BMAX and after every race his motor is always scorching hot. I do wonder whether it is the standard timing setting which is maybe just a bit too high and causes excessive heat, with the BMAX being such a heavy car?
I run a 5.5 Novak Ballistic on 21/87, I have never used an 84 spur but when I first had my Yokomo, I did always find that the gearing options with an 81 spur used to make the car run hot which made me standardise on 87 for the past 12 months...
Hope you find a cure!
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AE - Novak - Pro-Line - Reedy - CML - Atomic Carbon
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