sea ray laguna 21

[williamson]

I am the new owner of a 1995 sea ray laguna 21 with a merc 225. The motor seems to make a rumbling noise when in gear at the lowest rpm possible. As soon as the rpms are increased the noise goes away. I have been told this a quirk with this engine/boat combination. Anyone out there had a similar boat or have any info on what this might be?

Thanks,

Steve

[Jim31]

I have a '96 laguna dual console with a 200 carb. It vibrates like crazy. I did notice it ran a little better when using premium gas. I also use mercury quickleen in everyother tank fillup. I also spray power tune into the carbs. in the beginning of the season, and mid season. Good Luck.