Guy,s i am in total denial about any crank case leaks and you will probably get the impresion i am making excuses why i shouldn,t take it apart ,although you make a good point.So how do people get around this problem thoses that have fitted mikuni ,bing E.C.T .the level of vibration is not right by any means although mountings are good ,and as for air leak around the carb the nitral adapter is new and bolts are tight ,here we go again,anyone no where there is a walbro carb and adapter going