Do I have a bad ignition trigger coil??

[Snapper_Pro]

I have a snapper pro hydro 748 with a kaw fc420v-ds09 motor. The unit cranks up, but will not maintain a run outside of choke or low trottle. The previous owner replaced the ignition trigger coil before with a larger coil. Stating that the motor was not getting enough fire to run in full throttle or run the blades. I am now having the same problem. Is it REALLY the ignition coil? or should i be worrying about something else? Checked the carb and its seems fine...gas runs to the bowl. I need help before I spend un nessessary money on hoping i fixed the problem.

 

[wildbill]

Single cylinder or twin? What year model? Just at a shot from the hip, it sounds more like a fuel supply problem, like the main jet is plugged.