I have a Moki 2.10 mounted inverted on a DP Edge 540. The engine is a bear to start by hand inverted but I just couldn't bear to cut a big hole in the side of the cowl. The engine is a power house once you get the fire lit though. I use an OS type F plug and on board glow that is set to come on at about 1/4 throttle. I also use a starter to start the engine, it can be started by hand but I decided I like flying better than flipping.