when I first got my bike last year it had done 35,000 miles with no service history, and I noticed it hesitated between about 6 to 8000 revs, the first thing I did was change the plugs and that sorted the problem, I knew how it should run as this is my fourth fzs 600 fazer,
its not that I didn't like my previous fazers, I just kept changing them thinking that I was going to find a better bike, but I was always drawn back to 600 fazers