Identify carb. to raise idle

[crazy charlie]

Sitting on top of my 1988 5.0XL mercruisers are these carbs .The tag on the front state "Mercruiser 230 13478861 . I know nothing about carbs and need to raise idle in both motors .The idle has tweaked itself down over the 10+ years I have owned the boat with not having done any carb work at all. Can anyone identify the make of the carb and how to tweak the idle up.Thanks Charlie

 

[alldodge]

One the side of the carb there is a screw with a spring around it.

 

[crazy charlie]

Took the snapshot of that side because I thought that might be it.Does the carb look identifyable as far as brand?Thanks Charlie

 

[alldodge]

Took the snapshot of that side because I thought that might be it.Does the carb look identifyable as far as brand?Thanks Charlie

Yep, looks like a Rochester Q-jet

 

[FuelishBehavior]

Definitely a Rochester Quadrajet. There should be spring loaded screw just below the throttle cables where you can idle them up.

 

[Bondo]

Definitely a Rochester Quadrajet. There should be spring loaded screw just below the throttle cables where you can idle them up.

Ayuh,.... Agreed,... The idle screw is seen in Charlie's very 1st picture, with the spring on it,....