[stum]

If you are trying to go the same speed and don't change the voltage the avg. amp draw on the 3d will be higher or as high as the 2.5d. You are making each of these motors do the same things and just using different ways to get there. 18.5v is constant so you are gearing up the 3d making any gains a mute point vs the other, larger gearing = higher avg amp draw = additional heat. I'm going to say the 2.5d is the correct motor and something else is wrong iMO, bad connections in the bullets something.. else, do more trouble shooting! I would re-solder all connectors to the motor, look for binds through any shafts etc, bearing issues (diffs or axle) etc etc.. You could always go w/ the 3d and move to 6s lipo if you find nothing.

Im running a Medusa v2 60mm 2000kv on 4s geared for 40 and never get over 130 unless it's mid summer then its about 150 and this is after hours of use (15/48). I am using mechanical brakes though, not sure of your setup.