my 91 zzr250, which im trying to sell, all of a sudden has a massive leak. i have a look at it this morning and theres oil that smells like oil everywhere. im assuming its needle and seat/float stuck open, flooding the carbs and filling the crank case. so i drop the oil and only get about a litre out. my questions are i guess, could needle and seat/float be causign the problem and is there 2 drain plugs, 1 tucked away somewhere?