Idle speed varies prop size, but normally 1800 is fine. Over 2000 is too much. If you lean the fuel speed increases. I've changed the pull cord position to over shoulder in one of my old machine .Yes it is better than the normal low position and I could start it in the air once!I've used 5 or 6 different solo210 motors ,still got one. If you don't have electric start,then start the engine ,warm up switch it off, lay the wing properly,connect the wing (or connect it after getting up) ,start the engine sit on the harness attach it get up(attach the wing if you have not done it ).This is the way I always use if I'm alone.