lack of power

[Monongonebye]

I have a John Deere F725, it has lost power, I can keep it running by keeping throttle in choke position.
I have installed two new coils, thinking I had a ignition problem, but now I'm not so sure?

 

[Rivets]

Carb problem. Most likely will need to have it rebuilt. Don't know how many hours you have on the unit, but you might want to check the compression and valve clearances also.