Small Engines (Lawn Mowers, etc.): Kohler engine trouble, dirty fuel, loud pop

Question
Hello,

I have a Sears tractor with a 17.5hp Kohler motor that wouldn't start the other day, but I kept turning it over until I heard a LOUD POP! I then notice a bit of gas running out of the muffler, so I pulled the plug which was fouled of course so I replaced it. I tried to start the engine again but this time it popped even louder...   I'm somewhat mechanically inclined, but not sure about this one?  Engine is a 17.5hp with a OHV- model # CV490 type number 27532 if that helps.  Thanks in advanced for any help!

Answer
Jack

The first thing you need to check is your oil see if it smells like gas or looks overfilled and thin.You most likely have dirt, gum, varnish...etc in your carburetor plugging up the small passageways and jets in the carb. It Must be removed from the engine, cleaned very well, blown out with compressed air and reassembled using a NEW carburetor rebuild kit. ALWAYS clean the fuel tank and replace the fuel line when doing this repair or you may have to do it all over again. The inside of the fuel line disintegrates over time and these small pieces of rubber will plug up the carb too. Dirt and water from a dirty fuel tank will also plug up the carb. Find the Model, type and serial or code numbers off of the engine and take them to your local dealer to get the carb kit. Running your engine with diluted fuel will ruin your engine.