Hello I bought and assembled a GPZ 600 R in the winter. Now I’m finished with my motorcycle license in a week and want to drive as soon as possible. I built the throttle discs for 34 ps and new spark plugs. It jumps great running a few minutes and starts stuttering. I think it won’t run on all cylinders anymore. When I then screw out the spark plugs they are badly worn out. What can this be about? Do I have to put in other nozzle needles? Thanks e for your Antworen Greeting Steven