He did ask Bax, Bill gave him very good answers and right to the point. Bill also mentioned why OS gives such large prop listings in there instructions, something I have wondered about but never knew the reason for. Noise issues in Japan so they run bigger props to help quiet them down. Bill answered everything except the last question on a re-post about the stripped screw holding the carb down. That will effect the way the engine runs if the carb is loose or there is any air leak at all!! I'm set up to do most of my own work so I would be cutting new threads and installing a new screw one size bigger so I'm sure there is no air leak at all. After reading the article I sent there should be a better understanding of what glow plugs and nitro fuel are doing and give an idea of things you may try. Somehow I think it's an adjustment problem and trying to run an over sized four stroke prop. Props are easy to change, if you have an air leak in the carb/stripped screw there may be bigger issues. That should be reapired correctly and not with just a bandaid.