Hello Biker, after 25 years of abstinence from motorcycling, I had a youth dream and bought me a Honda CB 750 KZ (RC 01) Bj 80. After initially very slow turning at the gas grip and driving at low speeds I now already trust myself at higher speeds. The bike drives up to 7000 rpm perfectly. No jerking or hole at the high turn. But from 7000 rpm it doesn’t want to be right anymore. Once over, with a little less gas it also works perfectly, it turns bi Honda cleaned and synchronized the carburetors in the ultrasonic bath. Spark plugs, air filters and oil were also changed by Honda. Gasoline supply was checked, filters cleaned / changed. I was told to drive for a few kilometers. After 2000 km no improvement has occurred. Can anyone give me a hint what this might be?