Mercury 9.8 110 air/fuel screw question

[Anythingcanhappen]

Hey guys just a quick question. On my 1973/4 thunderbolt ignition 9.8 I am wondering how do I set the air/fuel screw. I tightened it in all the way then what should I back it off 1 turn? two turns? etc

Thanks for the help

serial no is 3737545

 

[60sboater]

Start at 1.5 turns.

 

[MTboatguy]

I have always set mine at 1 and 1/4 turns to start out on tuning.

 

[Anythingcanhappen]

Start at 1.5 turns.

Thanks I will start there

 

[Anythingcanhappen]

Now I have a new problem

It stalls out about 50 seconds
at 25 seconds I turn the throttle down then at 45 seconds it just dies. I then have to pump the ball really hard to force fuel into the carb to get it running again. I took the "fuel pump" off and cleaned that and no gain there either still doing the same thing video below. Oh also I have no clue what that rattle is

https://www.youtube.com/watch?v=nq7OViqXPrE

 

[60sboater]

Yours is a 1973,the '74s start with 3795658. I have a '73 110...runs but needed a lot of ignition work.

 

[Anythingcanhappen]

Yours is a 1973,the '74s start with 3795658. I have a '73 110...runs but needed a lot of ignition work.

Did you see the above video? Someone I know suggested a diaphragm kit and that should fix the stalling issue. Other then that it runs Great!!

 

[60sboater]

I just noticed the vid. I have not had a fuel issue so far (I did,however,go through it and changed the gaskets) but yes you could get the full carb kit with diaphragms (not cheap) and rbld it. Do you have an alternate fuel tank/line...may have some type of problem(s) with the one you're using.

Is the tank vent open...run it with the cap off for a test if not sure. I once had a 12gal plastic tank feeding a 100 Evinrude and it would die if cap was not loose.