Lawn Tractor Question

I used some brake clean and a rag and wiped down the fins. They are not that dirty. I am just stumped. Really do not want to pay to have the lawn mower shop come get my mower again but I got so much $ tied up in this mower I do not want to scrap it either. Besides the grass needs to be cut. Wife is all over me about the long grass.

To see what and WHERE I am talking about, you have to remove the flywheel cover. You cannot see where they clog if you don't. Course.....it may be for naught if you do.....but you'll at least know for sure. In fact, the last one I did, I even removed the flywheel itself. It's a pretty common problem with those. But from what it sounds like, yours doesn't run long enough for it to be that.....but I would still check.