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Your pilot jet might need to go up a size. Mine was in the shop for hard starting and they checked valves, carb, etc... They also recommended a "7" plug instead of a "9".
THERE IS SOMETHING WRONG W/ THAT BIKE FOR A 4 STROKE TO BE FOULING THAT MANY PLUGS. I LEAVE MY GAS ON ALL THE TIME AND NEVER FOUL PLUGS. U NEED TO TAKE IT TO THE DEALER