Small Engines (Lawn Mowers, etc.): Bolens 17hp Gas in Oil, gas seeps, crankcase oil

Question
My engine would not turn over more than one crank.  I pulled my plug and had alot of gas in cylinder.  Checked my oil, had gas there.  Drained my oil, replaced with fresh oil.  Changed spark plug and engine started.  It ran for a few minutes before gray/blue smoke started flowing out of the muffler and I turned the engine off.  Could this have been the leftover oil/gas just burning its way out?  Should I have let the engine run longer to see if it would have stopped smoking?  I thought this may have been a stuck float in the carburetor, but I am no expert either.  

Answer
 Hello Lance:

 The Reason for the Gas in the Oil is that the Carburator Float Needle Isnt Stopping the Gas Flow to the Carburator when the Mower is Not in Use and Floods the Cylinder. Then the Gas Seeps by the Rings into the Crankcase Oil. Install a Cutoff Valve in the Gas Line to the Carburator and Turn Off the gas Flow Manually when Not Using the Mower. You can Clean and Rebuild the Carburator but the Cutoff Valve is Needed Anyway. Newer Engines have a Soleniod in the Bowl that Shuts Off the Gas Flow, But they are Giving Problems Also. Run the Engine, the Smoke was Most likely the Excess Burning Out of the Muffler and Exhaust Port. Make Sure there isnt more Gas in the Oil. Send me the Make, Model, Type and Code Numbers Off of the Engine, Please. With these Numbers I can Locate a Breakdown/IPL for you to View Online. Hope this Helps. I am here if you Require more Assistance. Let me know what Happens, Please. Thanks.

 Good Luck

 Respectfully

 John