I have a 1994 Kawasaki 750 SS/XI...I have had it since 1997 and have had no problems with it up until two weeks ago...It will run great for 15-20 minutes then dies in the water...We have checked every line, new plugs, new gas...You name it...The carbs have been checked many times and nothing wrong...Even two dealers told me that a rebuild kit would be a waste of time and money...Does anyone have any suggestions to what to do next? I was hoping to get this out in the water a few more times before summer is over, but now I am thinking of giving up on it...

Thanks in advance...