well i want to sell a couple of engines and thought it would be better if i knew what year they where.I also thought i should at least know what the prob was or fix .The carbs are fine cause it reved all the way out by it self.I rode it around my yard went to pull back in the garage. I was not even on the gas then it just reved to the moon I grabed the clutch and laid on the rear brake to kill it..