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i have a waverunner 500cc 89, i hear that they have lots of problems. I have the revving up problem, it ideals great but wont rev when i gas it. I have rebuilt the carbs could the problem be in the CDI
 

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Wont be the CDI. Give it more fuel down low. Turn the low speed mixture screw out a turn. Also, check the plugs are the correct ones. If they are too hot it will run lean. I think they run BR7HS's but you should try some BR8HS's to cool it down. If you have the same problem again, put a bigger low jet in and try again. If it keeps doing it, the timing may be slightly advanced. You can rotate the stator back a couple of millimeters.
 

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I had the same problem with mine for a while. I drained the tank, put in fresh 50:1 mix, cleaned the carb, changed the plugs and now it runs great.
 
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