Scumdog has it --Haul the plugs out and replace em($20.00)
Then haul the lid off the air filter box and clean it out -You'll probably need to replace the air filter -I suspect the crankcase pressure would have pumped the oil up into the airfilter boxand the oil "leak"is the oil dribbling out from the overflow pipe AND oil will be going into the carbs/injection as well
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