ORIGINAL: goldswim5
It's just a cheap mystery outrunner, I posted a link at the top of this page. I was thinking 7.4v per demons advice.
That's a good motor. In fact, all of those heli outrunners with the 2.3mm shafts are good candidates, they're just difficult to cool properly. You can use that motor and get higher voltage batts or get a motor with a higher rpm range, but I feel 7.4 with that motor will be anemic.