I've got a bunch of planes with engines that are inverted and at the 135 degree position being described. I never use a starter on them. The first flight of the day I prime the engine by putting my finger over either the carb or muffler outlet. After this I usually don't have to prime. I also have never had one flood. If you think through it, it's actually very difficult to flood an inverted 2 stroke engine. If you happen to get too much fuel in the carb, it's just going to drip on the ground.