Hello dear community, I bought me a Kawasaki KZ 400 J 2 weeks ago. At the beginning she almost didn’t run at all, just went out, just jerked and so on…was then in the workshop of my trust, and he then said it was on the carburetor or on the spark plugs. After a long time looking around he finally came on the spark plugs, of which 3/4 were then replaced, and the box ran like a lace-up, only at 6000 upm he has jerked again briefly. After that the motorcycle stood n few days, white l it got cold again, and when I started the machine afterwards, I had an absolute power loss, the motorcycle tortures itself just at 100 km/h. In addition, it just went out again and stuttered. Again in the workshop, the one after the tank (engine doesn’t get enough gasoline) and looked again after the carburettor. Some dirt in the carburettor, that’s it. Now you jump at least super, and it doesn’t go out, but the performance list remains. Why did it run d a few days really great, and now not at all? In the workshop they told me then, could a previous throttle, which was not removed to the right or is due to the porous membranes of the carburettor. But then why did not she have the power loss all the time??? Have the feeling that the man in the workshop can not help me any more effectively, therefore I ask you now. But I am quite a newcomer in the field. I hope you can Help me.