air screw for carb?

celtic gelf

Seaman
Joined
Aug 21, 2011
Messages
68
i've read the great sticky on carb syncing and adjust ty...how far out should the air screws be on 150 force '89
 

jerryjerry05

Supreme Mariner
Joined
May 7, 2008
Messages
17,926
Re: air screw for carb?

Need to make sure the compression is good.With a good guage 145-150#.
The pumps diaphrams make sure they are good too.Reeds too.
The air screws should be 1 and 1/16 turn out to start.
Then after it's warm and in the water and in gear.Slowly turn in the screw till it just starts to cough/buck or stall then out 1/2 turn.Do this on all 3. The idle should be 750-800rpm in gear.Do it twice.
Some people say then turn it in a little bit after this DON"T.
Will cause piston failure and cost lots.
 
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