Hang in there. I have 4 Royal 40's and 4 royal 45's. Have some spare parts for them too. Been flying them for about 20 years on and off. I fly other aircraft, too, but when I want to just have fun I fly an occasional flight with one of the birds that has the good ol' 45 on it.
I have the documentation that you are looking for but have to dig it out of hiding. I'm thinking that the high end is 3 1/2 turns out for starters. I fly mine all the time but never have messed with them since I set them. I don't really want to mess with them now. I don't mess with it if it is working. I think that they were a darned good engine for the price. If I can find the papers that came to me with the engine, I'll give you what they say. Watch that low end screw. It has a tendency to vibrate. I put zap on those that vibrated for me. Could always remove it and ruff up the threads on it. I never expected Royal to fold. By the way, almost all the parts are interchangable with the old OS 40 and 45 engines.
I'll look for the papers tomorrow and e-mail you tomorrow evening.
If I don't get back to you, please e-mail me. My dad is in the hospital and we are very concerned about him (he's 89). My mind may be on him.