Air Screws

Glenn H

Recruit
Joined
Jun 11, 2012
Messages
1
Hi Guys!

I am working on my 1978 Mercury 90 hp, 6 cylinder outboard: How many turns is it on an air screw for this?
 

oldman570

Lieutenant Commander
Joined
Mar 25, 2011
Messages
1,615
Re: Air Screws

I start from lightly seated then 1 1/2 turns out and do final setting in the tank or in the water in forward gear to get them set to idle at 750RPM as smooth as possiable, and do a complete link and sync then also.
Oldman570
 

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
27,036
Re: Air Screws

Glenn, The idle mixture adjustment is a fuel screw. CCW richens the mixture.
 
Top