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Message: [QUOTE="mole1, post: 501784, member: 33009"] if the only thing you changed besides the plug was the fuel , i would suspect maybe some bad fuel or possibly some debris stuck in one of the jets or vent hoses . a colder plug would foul a little quicker but unless your jetting is way off i don't think it would be the immediate cause of your problem . changing plugs is inexpensive so i would replace the fuel and go with the stock plug and see if that works and if not then open the carb and have a look . don't you find the rm a lot more fun than a drz ? [/QUOTE]