allot has to due with the screws that push against the motor to hold it. The motor has to be perfectly upright and balanced with the swashplate. If you have it off it will do this as well as not run smooth and take more volts. If it is off it bind the motor shaft as well as throwing the balance off. It can also cause the motors positive to touch the frame and ground out.As well as were they push against the motor can wallow out a small fraction due to vibrations causing it be off balance etc.
There is very little wiggle room.The best way to do it is back them all out. They have loctite-on the screws but after several years they get looser so they are easy to back out.. As well as were they push against the motor can will wallow out a small fraction due to vibrations causing it be off balance etc.
When you start to screw back in the motor screws dont try to screw them to the same outside level to the frame-they are not all the same exact size as well as the case being thicker in certain areas etc. So you must start and slowly screw in till you fill it touch the motor can and stop-but put no extra pressure.Then go to the next one etc. Its best to start on the bottom ones then go to the top. After they are all touching go back and put the same very slight pressure evenly on them all.You must not crank down even a small amount like you would on a neo or bishop.It only takes very very slight pressure to secure the motor as the cases tolerances to the motor are very high and there is multiple screws. Think of it more as balancing the motor to the swashplate not trying to hold it place. The best way to do this is thru feel of the allen wrench. Dont look at how much screw is in are out in relation to the frame. The first time it will take a bit of time and doing it a few times. If its done right the machine will run very smooth and run on very low volts. I would recomend rebalance it a couple times a year. If you use loctite put the weakest one on. I would not put it on first thoe till you have done it several times and you know it by feel-which it then becomes quick and easy.