carb screw locations?

beason

Petty Officer 1st Class
Joined
Mar 15, 2011
Messages
338
Does anyone have a photo or diagram with the carb screw location on the merc 3.0l?

When i got the boat, it was running super rich, i had a mechanic friend of mine adjust it on the muffs, but i think he went a little too lean. Now it takes a tiny bit of throttle to start the engine, and i would like to richen up the idle side just a little and see if that helps. Problem is, i dont know which screw does what!

Thanks!
 

Don S

Honorary Moderator Emeritus
Joined
Aug 31, 2004
Messages
62,321
Re: carb screw locations?

These should do it.
 

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beason

Petty Officer 1st Class
Joined
Mar 15, 2011
Messages
338
Re: carb screw locations?

perfect! that should be visible on the right side of the engine if you are inside the boat looking back at it right? under the intake?
 

beason

Petty Officer 1st Class
Joined
Mar 15, 2011
Messages
338
Re: carb screw locations?

this worked perfect! 1/4 richer on the idle screw and 2hours up on the idle speed and she purrs like a kitten. takes about 3 "wurrs" before she fires up. For a 20 year old engine, i call that a success.

Thanks don!
 
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