check out the speed calculator and choose gearing based on the speeds you're looking for.

You probably will want a fan on that MM, and probably some additional caps. An 8xl on 4s in an 8ight is going to be a lot for that little controller. Don't be suprised if the stock caps don't handle it for long. I'm not saying it won't work, just be careful ;).

J.

lol, darn. Brian beat me to it! Posted as I was typing.