carb adjustment

cooter2506

cooter2506

Senior Chief Petty Officer
Joined
Apr 8, 2007
Messages
733
I have a 1998 5.0 mercruiser with a two barrel carb. In my manual it is telling me to make the final carb adjustments with boat in the water. can it be done just on the muffs? If it must be done in the water its ok I can do that next time i take boat out but just dont understand as to why it would have to be done that way. Thanks
 
J

John_S

Rear Admiral
Joined
Jun 21, 2004
Messages
4,269
Re: carb adjustment

The muffs do not simulate the back pressure from the water on the exhaust. Adjust it on the muffs, and redo the next time on the water.
 
S

sidebojj

Cadet
Joined
Jul 12, 2007
Messages
24
Re: carb adjustment

If they are talking about setting the floats, they probably want to have the boat in the water so it is level where it will be running.
 
J

John_S

Rear Admiral
Joined
Jun 21, 2004
Messages
4,269
Re: carb adjustment

Unless it has changed, float adjustment on the merc carbs I've seen was always set at a specific value based off a reference point on carb. Idle mixture and idle speed are typically doneon water.
 
wewefirex2x

wewefirex2x

Petty Officer 1st Class
Joined
Feb 19, 2007
Messages
267
Re: carb adjustment

That's good info because I just picked my 2 barrel carb up from getting a rebuild.
 
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