I just bought a '96 ZX7 with 20,000k's in immaculate condition just because I've always liked them. I took it out for it's maiden voyage today and all was good for 10km then the revs dropped and it stopped. I started it again and held full throttle which would only rev to 1500rpm. As soon as I shut the throttle it stopped again. Eventually I got home and got the trailer to pick it up and then it started and ran normally. On the second outing it did the same thing after about 10 minutes of riding. The carbs have been cleaned but it still does it. Any ideas?