Thanks for the tips, we managed to find a manual for the engine and got the settings correct. It is now running sweet as a nut, our next problem is going to be sourcing some propper props for it. The boss size is slightly larger than normal due to the manner of fitment and needs to be 22 millimeters in diameter with a thickness of 17.5 millimeters. We are looking for a 20 or 21x8 prop preferably wooden. If we can find the right sizing then we will order a few - just in case :-)