I bought a 96 zx1100e, with 10,000 miles, the guy had started having issues with the fuel getting into the air cleaner box and leaking into the oil, could someone please tell me what is causing this problem. I cleaned the carbs and had them resynced and it started fine and ran really good. It has a aftermarket shut off valve on the fuel line from the tank to the carbs for this problem, but now the fuel is just gushing through the air box. Any help is greatly appreciated.