The EI runs off of a 4.8v battery pack. We run a 16x8 on my sons 26 which is the benchmark prop. I run a 18X8 on my 40cc and an 18X6 on my OS 160 in my Christen Eagle. Sorry for the confusion. You should be able to start that motor with an electric hand starter. They run really sweet. Make sure you put a nipple in the pulse plate and run a piece of fuel line from there to the inside of the fuse though. It doesn't like a left banking knife edge without it.