Using a vacuum guage on 1988 OMC 5.0

[jbutler67]

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.

 

[jbutler67]

1988 OMC 5.0 is 502APRGDP

 

[Scott Danforth]

there is no vacuum port on most marine motors.

so set the idle mixture to get you the highest RPM

 

[Redrig]

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 .

 

[HT32BSX115]

there is no vacuum port on most marine motors.

so set the idle mixture to get you the highest RPM

:thumb::thumb: Yup. Don't need to waste your time fiddling with a vacuum gage on a marine engine.