If it only runs on three cylinders, then it suddenly pulls off at full throttle to expose itself immediately to it. All float chambers fill up, I tried that, the carburettors are supposedly ultra sound cleaned, at least externally pieksauber, however, this has made a Yamaha – dealer, not myself. Before I take them apart now and shell them myself, maybe someone has an idea, the same experience, it is what banal ? spark plugs are new, filters are also. And: W as have the six (!) black hoses for a purpose that disappear from the gasses in the Nirvana in front of the battery box (and are nowhere connected)