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I gotta stop doing that with mine - I have had my motors stall out on me in the water before when itt gets real deep. What happens is the water gets inside the motor and shorts out the comm and brushes. As soon as I pick it up it's fine. I was in the middle of a motor swap yesterday when I shattered the pinion putting a setscrew in, now my Bronco is down for a few days.
small lighter weight. 3 cell will help. What pinion you running on the 55 turn.