[jhautz]

10xl will be fine for the track, certainly better than a 12xl anyway. You just have to make up some of the speed with a little taller gearing.

I actaully run 5s in my MMs all day long. I have 3 of them running 5s. Never had a problem. The only MM I ever burnt was due to cogging on a Neu motor before the software update.

The only trouble I see with 5s is that the newer MMs dont seem to like to run it. I have all older ones. But I was talking to Mike earlier today and he mentioed that he was able to get newer MMs to run on 5s. You just need to go into the usb programing software and choose restore defaults. Then shut it down and unhook it, then you can go in and set it for a custom voltage cut off of 15v and it should run ok on 5s. I dont have a new one to test it with so I cant comment. this is just what I was told.