[THEFERMANATOR]

Originally Posted by phatdaddy

i have a 2003 150 and the idle adj is on the middle carb. with the cowling removed stand over the air shroud and look straight down on the starboard side at the middle carb. should be a phillips screw looking back at you. if you work the butterfly's with your fingers, you will see the one . it might be easier with the air shroud off , but its a pia with 12 screws holding it on.

I did a little digging and I found that he has an 86 150. It also adjusts with one screw on the center carb just like yours does. And the idle should always be set with the engine in the water at temp and normally to about 600-700 in gear.