Last week while mowing with my 25hp Walker i noticed that one of the two exhaust pipes were glowing red ( I was mowing before the sun came up). I assumed it was a leaking intake manifold gasket that was causing that cylinder to run lean and over heat. I pulled the engine, replaced the gaskets and put the mower back together and still have the same problem. Has anyone ever had this problem before? I'm stumped on this one.