Well back in the day when racing was still around the number one starter was a home built for the unlimited planes, it was just a 12 volt starter from a Toyota mounted in a box with a 12 volt auto battery. I still have an old one someplace? John is showing you some very good starter choices. A couple of the guys where I fly just have 24 volt drills with the big cone attached. When my G-62s didn't want to start I would borrow one of the drill starters and it zings the engine over very well but almost no one uses a starter on a gas engine. A leather welding glove is a bunch cheaper and almost no one uses them either. A well tuned gasser fires in just a couple of flips.