Question about kawasaki ZXR 750 Motorcycles

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I have a ZXR 750 J2 (1992 model) and it used to pull strongly from 10 000rpm through to the rev limiter, I got a dyno jet kit fitted and since then the power delivery has changed, it no longer pulls strongly from 10 000rpm but rather drops away quite rapidly. The bike was serviced and the shims done. I have since tried to have the jetting restored by no one sems to get it right and I don't have the original jets and needles that came out of the bike anymore. Someone told me that it might not even be the jetting as a reputable dealer(Dynojet registered Kawasaki dealer)worked on the jetting and that it might be that the exhaust timing might be out by a tooth or more. Is this a feasible option to explore?

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Did you had someone install the jet kit and adjust the valves? If you did i would take it back to the shop.If you did it then you will have to troubleshoot it to fined the cause. Do a spark plug reading this will determine if the bike is running lean or rich.And yes it is possible to have the timing off. Hope this helps

Posted on Sep 28, 2010

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  • graham_go912 Sep 28, 2010

    Yes the jet kit was installed by a shop and the bike was serviced, he said the shims were done and he did report that the bike was set up to run a bit rich as I was doing short tracks with it at the time. I am taking the bike to a guy today who told me about the potential of the cam timing issue so can and will feedback as soon as I know, but thanks for the confirmation!

  • Dietrich Houston Sep 28, 2010

    Was the bike running ok before it went to the shop for the jet kit? if it was take it back to the shop that installed it they need to repair it correctly.

  • graham_go912 Sep 29, 2010

    Yes the bike ran very well, unfortunately the shop does not exist anymore but I took the bike to the guy last night who suggested it might be the cam timing, so I will know before Friday if that was the problem. But I will post the problem and the solution for others to learn from if indeed this is the case.


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