I parked it in the barn one dayand it was running perfect. A couple of days later it would not start. I tried to start it on starting fluid but it would not fire. The spark going to the plug looked a little yellow . I put a new coil on it, no luck. Any suggestions?

 

The spark sounds fine you may try cleaning carb. Also take the fuel line loose right before it goes into the carb to make sure your getting fuel to it. (Make sure the fuel at the tank is shut off prior to this, after its loose turn it back on to check the flow). If this doesn't help try clean out the carb.

 

Usuallly It's fuel; fire or air.If not I would kill myself.