Need help. The cylinder near the belt keeps eating plugs every 25 miles or so, the plug is wet and black, the other plugs are fine and look normal, I have K&N air filters, the boots are good, I have mikuni 38 carbs with new boots. The sled is a 1995 ZRT800. This problem just started, has anyone out there had a similiar problem, and what did you do to rectify it. Any help would be appreciated. I ride in the Haliburton Ont area.