Written by Sean Vogelsang. Bought this set up for a Razor MX650. I had to mod a lot of things to make it work. The wire on the motor has to come out the side (modified) the screws on the rear plate are in the way for the razor sub frame. I wish they recess the screws like the factory motor. (I modified this issue) had to cut the bottom bracket off on one said because it hits the frame. And I had to grind and drill a hole in the rear end to make it fit correctly. Powered by 2x 6s lipo 48V and makes the razor mx650 so much fun!! This motor is decently fast, maybe to fast for your average kid. It_ to fast for my 38 year old brother, he won_ ride it because I slid across the grass coming in hot from the street on this thing, lol!! Just buy it, it_ not to expensive and it works great. But you do have to modify a few things to make it fit for your MX650 razor scooter.