RE: us41 in byron p51
Don't despair. You've got it running and now you are melting all of the old gasoline residue out of the carburetor. It will continue to improve in its running characteristics with the more running time that you accrue.
When starting the engine by hand, it is important to accelerate the prop through top-dead-center (TDC). After all, the electricity that is used to develop a spark across the plug's electrodes is generated as you whip the prop through its arc. Limp wristing will just ensure that the engine will not start. In fact, now that you have gotten the engine started by hand, you should feel proud. Not many folks can master that skill. Stay at it and you will get it down like a champ. Stop in and let us know of your progress.
Ed Cregger