You'll be ditching that 7xl right quick, if it lasts long enough ;). It's too hot a motor for something heavy as a Revo. 8xl even runs too hot on 4s in my Revo. My 9xl on 4s is good for only about 15 minutes before it's too warm for comfort.
J.
feigaos will stay cool if you can run them in a meat locker....