Idle Screw On a 2BBL Carb

[sebagolake19]

Good Morning Everone,

Can someone tell me where the idle screw is on a Merc 470 2BBl carb?

It looks like it's the screw closest to the front of the boat. It seems it's a stopper type setup. It stops the linkage where ever you set it. I took it out yesterday all day and it ran great but I noticed it would idle real low (500 RPMS) and die every once in a while when I put it into gear. I just had the carb rebuilt by a professional Merc mechanic.

Thanks for the help.

 

[Don S]

Re: Idle Screw On a 2BBL Carb

Hard to say where it's at, what year is this 470, and do you have a Rochester or Mercarb carburator.
The Mercarb has a single idle mixture screw and the Rochester has 2

 

[sebagolake19]

Re: Idle Screw On a 2BBL Carb

Hard to say where it's at, what year is this 470, and do you have a Rochester or Mercarb carburator.
The Mercarb has a single idle mixture screw and the Rochester has 2

Hi Don,

It's a 1987 Merc 470. I believe it's a merc carb.

 

[sebagolake19]

Re: Idle Screw On a 2BBL Carb

Bump

 

[Don S]

Re: Idle Screw On a 2BBL Carb

Below is a link to the oem manual. It's 355 MB, so it's a big download. But it will give you all the information you need to adjust your carb.

http://www-alt.mercurymarine.com/mnetdata/SERVICE/CRUISER/Servmanl/08/cover.pdf

 

[sebagolake19]

Re: Idle Screw On a 2BBL Carb

Thanks Don S. That .pdf rocks!!!