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Had my waverunner out for the fourth time today and after about 30-45 minutes we slowed down for a few seconds, then wanted to get going again. When we did that, the waverunner maxed out the RPM's and would not go faster than 5 MPH. We got it to a dock like that after riding it for about 3 more minutes. We have not tried to fire it up since then. It never died out just wouldn't gain any speed. Water pump was pumping out water. Looked in the impeller and the grate for sticks or debris but did not find any. Any other suggestions? I've read a few other posts where people discussed a problem similair to this but nobody ever got an answer back. Any help would be great. If you want you can email me at walsh76 at msn dot com.

Thanks, Brad
 

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Brad, change your plugs! If your plugs go bad, the ski will do exactly what you just described even if they still look good. If the ski is still doing that after you have replaced the plugs, then check each cylinders compression.
 
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