Kohler 17.5 Exhuast running cherry red

I got a L110 John Deere with a Kohler 17.5 Command in it. It has been sitting for four years collecting dust so I figured I would get it out. I drained the gas and changed the oil, new battery, When I first turned it over, it flooded. So I cleaned the carb. It started up but kept shutting off narrowed that down to the damn anti back fire solenoid on the carb. Removed it replaced it with a screw starts runs now the exhaust is glowing cherry red and when I say red I mean you could forge weld kind of red. My gut tells me it's a stuck exhaust valve but I figured I would ask the masses to see what you think.

Kohler 17.5 Exhuast running cherry red