Engine Vibration Mercury 90hp S/S

[gomalley51]

Hello,<br /><br />I just bought a boat with a 90 Mercury S/W engine. It performs very well but I have an area of concern. Between 1000 and 2000 rpms there is quite a bit of vibration. The dealer mechanic said that this is due to the carburators switching stages. I believe him, but I wanted to see if anyone else has experienced this. Thanks for any info.<br /><br />Regards,<br /><br />Gary

 

[JB]

Re: Engine Vibration Mercury 90hp S/S

Howdy, Gomalley.<br /><br />I assume you are talking about a new or late model 3 cylinder Merc. 90.<br /><br />They are rough at idle and erratic in transition from idle. That is normal for that engine.<br /><br />I don't like it either, but every one I have used did that. <br /><br />Good luck.