Johnson V4 85hp 1980 Where is the idle mixture screw

[spybot]

Where is the idle mixture screw.
I have had my carbs rebuilt not by me. They were taken off the engine but now i have them back on she seems to be running very lean. Coughing and sneezing im trying to find the mixture screw but for the life of me i cant find it any where.
I have tried online but cant get the answer. Pleas someone help me on this

 

[racerone]

Maybe that is because there are no mixture screws on it !!------Start with a compression test.

 

[boobie]

You'll have to do some re-jetting to get the mixture correct. It's a PIA.