I would suggest some carb work. From my experience, the coil either works or it doesn't. Have you removed the carb and cleaned it. I have seen more LB's that don't start or have some starting issues and all that is needed is a carb cleaning. I check for carb troubles by spraying starting fluid down the throat of the carb. If it fires up with starting fluid, then I clean the carb to get it to run as it was designed to do.