Hello, I have Sears Craftsman riding mower with a Kohler CV490S (17hp, 1 cylinder), and I having a problem with the engine. When set at operating speed while everything is in neutral the engine isn't running fast as it should (sounds like it running under a real heavy load), and the exhaust/muffler glows orange. I checked the compression, replaced the spark plug, fuel filter, air filter, oil/filter, cleaned the carburetor as best as I could, it's getting good fuel flow to the carb, and tested the electric fuel shut off solenoid (works as it should). If I try to choke it, or idle it, it will die out (it is also now hard to start when it's either cold, or hot). It ran fine yesterday for 3 hours, but went to run it this morning, and it just don't want to run right at all. Anyone have any ideas, I'm at a loss with it :confused2: !!