I thought I would share my (new to me) Tello experience. Recently I underwent a complete motor change and changed to new (cheap) propellers. You know, the 5 color ones. 10 bucks for 10 pairs. I have used these before and they were "ok". After many flights of Tello behaving "normally" I inadvertently touched one of the motors post flight and it was scorching hot! I mean not just a little hot, enough to burn my finger! So my immediate thought was I must have installed the motors wrong or they were defective. The props looked fine, spun fine and flew fine but both CW motors were way too hot after flight. I tried calibrating, inspecting for shorts etc. Luckily (on a whim) I tried a new set of props (same cheap ones but different color). Voila! Motors are now just as they should be. My advise is always check your motor temps post flight after installing new props OR after a crash! OEM or not! I hope this is helpful to all! Happy flying!