Loss of Top Speed

Thanks for all the advice on this, wanted to report back on the cause of the problem. I had a recent tune up on the engine and went back to explore the low RPM issue, I pulled all the spark plugs and 5 of the 6 looked normal for plugs with ~10 hours. The 6th plugged looked brand new and had no signs of having ever fired. I replaced all the plugs and the boat is back to normal. Thanks again!
Should shave added rpm went back up to 5900,
 
Thanks for all the advice on this, wanted to report back on the cause of the problem. I had a recent tune up on the engine and went back to explore the low RPM issue, I pulled all the spark plugs and 5 of the 6 looked normal for plugs with ~10 hours. The 6th plugged looked brand new and had no signs of having ever fired. I replaced all the plugs and the boat is back to normal. Thanks again!

good find! and... wow! that's crazy
 
Wow, thanks for circling back. A bad plug, that's pretty rare in a newish motor. Glad you got off cheap and all is back to normal.
 
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