Using a vacuum guage on 1988 OMC 5.0

jbutler67

Petty Officer 1st Class
Joined
Jun 19, 2016
Messages
220
I want to get my idle mixture just right and wanted to do it with a vacuum gauge. Anyone know where I can hook up a vacuum gauge? The carb is a Rochester 2 bbl marine carb. I don't see any vacuum ports. Carb # - Rochester 17059060.
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
Staff member
Joined
Jul 23, 2011
Messages
47,296
there is no vacuum port on most marine motors.

so set the idle mixture to get you the highest RPM
 

Redrig

Master Chief Petty Officer
Joined
Oct 13, 2009
Messages
849
on my ford , I had to hook the vacuum gauge up to a port on the intake manifold that was full vacumm , cuz like yours there is no ports on the carb itself .
 
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