RE: Mounting 2 strokes upside down
First, you look to find and inverted muffler. This allows the pipping to hang down. Second, you may have to lean the low-end a tad or simply run a glow system, which can be as simple as a 1.5v batter, battery holder, pos and neg wire and glow plug cap. I have a system from SM Electronics that allows me to plug into my receiver and set when I want the energy to plug to flow.