Quote Originally Posted by crappiemax View Post
I would think the humidity could be the culprit. I would think any motor that has been sitting outside not being used for 6 or 7 years could suffer that problem regardless of brand.
I had a MG on my boat for 13 years without 1 problem. I wanted it to die so I could buy a new digital. Finally, the speed control switch started acting up so I seized the moment and made the switch.
I would venture to say you are prob right with this answer.

The motor is sealed to withstand 1 atmosphere of pressure. However, that is only the motor. There is air passage from the crown to the motor via the shaft. This is not an airtight seal.

Water (and rust) will not hurt the motor. What gets damaged is the brush springs, etc. that are not corrosion proof.

DC motors will run under water without any seals. Just have to wash the moisture out every time you use it this way. FYI