The physical condition (color) of a spark plug shows how the engine is running...... sounds like it's time for a carb clean and tuneup!
I would guess your carb isn't clean/working correctly, which is in turn fouling your plug. If it were me, I'd first attempt a dose of Seafoam or you favorite flavor of gas treatment / fuel system cleaner. Add it to the tank as per directions/amount of fuel. Run it long enough to work it's way completely through the system. Allow it to sit and soak for a day or so. Now run the machine for a good time to clean the system out. Over the course of the next few tanks of gas keep using the Seafoam. If problem persists..... time for a tuneup!
NGK is the best plug for the polaris...maybe try running the iridium plug equivilent to the one your running now....a parts store can cross refrence to the iridium one..they are around 7-8 bucks...try advanced auto or napa
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