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Landmass
Ole Miss Fan
Member since Jun 2013
11725 posts

Mercruiser carb question
I've had my boat for a few years. Most times it will run well but then sputter when I shut the engine off. Then it becomes difficult to start because it seems flooded. I decided to do a carb rebuild and removed it. That's when I noticed that the carb has been zip-tied with the choke fully open by a previous owner.

What would be the reason for this? Any ideas?



lotik
LSU Fan
Member since Jul 2018
246 posts

re: Mercruiser carb question
Incorrect jetting, or they need to be cleaned.
This post was edited on 7/26 at 4:45 pm


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deeprig9
Georgia Fan
Member since Sep 2012
46878 posts

re: Mercruiser carb question
Fully open choke would probably give you the opposite results. It would hot-start and run hot just fine. Typically. Starting cold would be the problem.

There's likely more going on with the carb and the ziptied choke was more of a work-around.
This post was edited on 7/26 at 5:35 pm


baldona
Auburn Fan
Florida
Member since Feb 2016
15787 posts

re: Mercruiser carb question
Yep, as said are there other things in line? Rpms? Have you checked the fuel pump?

Sounds like it’s getting too much gas so they kept the choke open to add air to overcompensate. It doesn’t sound like a dirty carb to me, but that you are likely supplying too much gas. This could be the wrong carb, carb needs adjusting, too much fuel, etc.

It’s likely a simple issue though. The previous owner probably got the engine running fine on open choke and left it there instead of solving the actual original issue.
This post was edited on 7/26 at 5:39 pm


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Landmass
Ole Miss Fan
Member since Jun 2013
11725 posts

re: Mercruiser carb question
I found out that it was missing a cam for the choke rod to connect to. I think the previous owner simply “rigged” it open to make it cold start.


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bouefbengal
LSU Fan
Baton Rouge
Member since Jan 2005
2223 posts

re: Mercruiser carb question
Interesting I have an older mercrusier that starts fine and runs great for 30 minutes then will sputter die and is hard to restart.


DownshiftAndFloorIt
US Space Force Fan
Here
Member since Jan 2011
59801 posts

re: Mercruiser carb question
That sounds like a worn out engine to me.


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DMC226
LSU Fan
Hammond, Louisiana
Member since Apr 2014
48 posts

re: Mercruiser carb question
This guy has useful videos on setting the carburetor for a 2 barrel Mercarb. LINK


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