69' Johnson 9.5 shutters Intermittently at Idle. See video

[Calcasieu]

I am unsure if this is normal or not. The motor shutters slightly at idle intermittently. I have a link to a video in hopes someone can lead me in the right direction of a diagnosis. The shutter happens at approx. 2 seconds and 5 seconds in the video.

Thanks!

 

[joeanna]

my 2000 50hp johnson shutters/stutters just off idle, I've not been able to figure mine out yet either??

 

[RCO]

Low speed mixture needs to be richer, or carb is dirty.

 

[lindy46]

Low speed mixture needs to be richer, or carb is dirty.

Agree

 

[Calcasieu]

I was thinking lean/rich screw as well. I may be able to test it tomorrow. Regardless I'll report back with what I find when I do.

Thanks everyone!

 

[Calcasieu]

No Title

Adjusting the lean/rich screw did the trick! Here is what I did for anyone experiencing a similar issue.

I warmed the motor up for about 10 minutes. I dropped down to idle with the boat in gear. I turned the lean/rich adjustment screw about 1/5th of a turn counter clockwise (richer) and adjusted the idle stop screw out to idle even lower. It now idles lower and smoother than it ever has. The boat ran great all day! No more shutters.

Bonus picture of one of the fish I caught that day.

Thanks everyone!