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Mercury 305/5.0L vibrates around 1500-1700RPM

Bayliner 2655

New member
Hello
Trying to figure out what might cause a vibration that can be felt in the boat around 15-1700 RPM and it will come and go in a rhythmic fashion.
This will happen regardless if in reverse, forward or neutral. One suggested change the sparkplugs and it did not change.

thanks
Thor
 
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