I run 4 trustfires in my N-strike Rayven (stock motors), have for a few years without burning them out - granted I only rev it up just before firing and let off motors the instant I'm done. I also recharge the batteries after every war it sees use.
Considering this could it then be said that stock Rayven motors are more durable than stock Stryfe motors? From what I've found it seems to me that replacing the Stryfe motors with Rayven motors would allow for longer motor life if you decide to use 3 *fires while at the same time allowing the option of using a fourth cell with a lessened risk of burning out the motors in your blaster.
I'm considering replacing my Stryfe motors with a set of stock Rayven motors but I haven't read of anybody doing this.