My Scag quit running after 10.8 hours

Hello All,

A few months ago, I purchased a Cheetah. I haven't used it much as it only has 10.8 hours on it. I was mowing a few days ago and it started mis-firing and then quit.

I checked for fire: Good.
I checked for fuel: Good.
I checked the air filter: Good.
I put a squirt of fuel in the carb and spun the starter: NO GOOD!!!

So, with nothing else left to do, I pulled the plugs and they looked awful. Dark black everywhere.

I put new plugs in and it took off running great.

So, I visited the local shop that I purchased the Cheetah at and the only idea that they could come up with was that since my back one acre is very bumpy, maybe I was bouncing the carburetor float around and the fuel/air ratio was pooched. I don't know about that one. Also, I typically run it at full throttle.

Any ideas?

Thanks,
John

My Scag quit running after 10.8 hours