Gas in the oil. Why?

I have a 2004 Sportsman 500. Ever since I bought it I have had gas getting into the oil. When using it after changing the oil, the oil level keeps creeping up on the dipstick and smells strongly of gas. I've had my dealer work on it several times with no resolution. I called a different dealer today who said he'd seen this problem several times before on the Sportsman and hadn't figured out why or how to remedy. When I asked him if this is a Sportsman 500 quirk, he said it was. Any thoughts or suggestions?  

well the only thing that comes to mind here, is that it's allowing gas get below the piston rings and into the crankcase.  

I would say either a design flaw in the head or a design flaw in the piston.
either way it's a design flaw.
every polaris i have ever owned had some design flaw or another.
i finally quit buying polaris all together.  
Keep it RUBBER SIDE DOWN!!

it would be the carb flooding over into the combustion camber. the fuel braes down after a month at the most. i would clean and rebuild the carb and run a fuel stablizer like briggs and straton fuel stablizer not stable  
2008 polaris sportmans 500 efi

the carburetor is designed to overflow at the bowl so that it does not draw in too much fuel into the cylinder.

so the carb flooding would not do this.

bad piston rings. broken piston skirt, or a cracked or broken cylinder.  
Keep it RUBBER SIDE DOWN!!