Hi Martin, there are a lot of very Knowledgeable people on the forum. Some of them restore old engines for a living. It would help to know where you are. I`m in Australia where I would recommend Rob at Old Timer Engines. In the UK there is a guy called Lucien Nunnes who is an expert on all things Startomatic. You will find him on the stationary engine forum. In the USA you should start with Gary at Diesel Electric.
Good luck and welcome
Bob