Small Engines (Lawn Mowers, etc.): Smoking Engine, crankcase oil, flow valve

Question
I started the engine and it ran fine for about five minutes and then starting smoking heavily with white smoke and then died. I started it again and it ran for about 15 seconds with the white smoke.
I took it back to the garage and there was oil on the front of the engine and also coming out the muffler.  I check the oil and it had gas in it and also the carb had oil in it.
 The mower is an CV15T with a 15HP Kohler Engine.

Thanks in advance,

 Vic

Answer
Hello Vic:

Check the Crankcase Oil. Does it Smell like Gas and is Over Filled? If Yes, then the Carburetor Needle Valve is Allowing Gas to Leak by and Flood the Cylinder when the Engine is Not in Use. Change the Oil. Make Sure to Drain the Engine Good. Refill to the Proper Oil Level and Install a Manual Cut Off Valve and Manually Turn Off the Gas When Not Using the Mower. If the Carburetor Needle Flow Valve Leak is Not Affecting the Engine Operation, then you Do Not Need to Clean and Rebuild the Carburetor. When the Leak Starts to Interfere with the Engine Operation, then you Will need to Clean and Rebuild the Carburetor. I Say this Because I have Done So Many that a Clean and Rebuild will Usually Last a Few Months and then the Same Condition Occurs. The Manual Shut Off Valve is the Only Way I have Found to Stop the Flooding of the Crankcase when the Engine is Not in Use. Hope this Helps. I am Here if You Require More Assistance. Let me Know What Happens, Please. Thanks.

Good Luck

Respectfully

John

PS: I am Allowed to Answer 10 Questions a Day. If you See I am Maxxed Out, then Try Submitting your Question at or Just After 9pm EST (US). My New Day Starts then. Thanks.

Respectfully

John