As far as the heatsink fit on the tekin motor (1400kv) it fits great. Like Danger said you need to open it up a little bit , but you can get it on. I also used some Arctic Silver Thermal grease on mine, and I think that will help the heatsink draw more heat out of the tekin can. I used some smaller diameter screws (with washers) and some locknuts I had laying around to clamp the heatsink down, the smaller diameter of the screws allows you to thread in the screw, even at the angle. Once you tighten it down, the screws align better as well.
Fits perfectly under the JC Illuzion body. We'll see how much it lowers temps.