1987 Johnson 9.9 Idle screw starting point

[Evinrude Boater]

J10RCUE Rebuilt the carb and wondering how many turns out is the starting point for the idle screw.

 

[Rick.]

Re: 1987 Johnson 9.9 Idle screw starting point

1.5 turns out after gently seating should get you started. I'm assuming your talking about the slow speed needle. Best of luck. Rick.

 

[Evinrude Boater]

Re: 1987 Johnson 9.9 Idle screw starting point

She's running with it at about 3/4. Thanks

 

[Vic.S]

Re: 1987 Johnson 9.9 Idle screw starting point

Joe Reeves' detailed instructions for adjusting the carb needles can be found on the "Engine Frequently Asked Questions" board.

 

[Evinrude Boater]

Re: 1987 Johnson 9.9 Idle screw starting point

Joe Reeves' detailed instructions for adjusting the carb needles can be found on the "Engine Frequently Asked Questions" board.

Thanks, I've been there for my older engines but I wasn't sure if the newer engines have different procedures.

 

[Rick.]

Re: 1987 Johnson 9.9 Idle screw starting point

Ya gotta love it when a 1987 is refereed to as a newer engine. OMC forever. Rick.

 

[Evinrude Boater]

Re: 1987 Johnson 9.9 Idle screw starting point

Ya gotta love it when a 1987 is refereed to as a newer engine. OMC forever. Rick.

Yeah, last year I updated twenty-three years. Someone asked me how long an outboard lasts. I didn't think twice and told them Evinrudes last...forever.

 

[Evinrude Boater]

Re: 1987 Johnson 9.9 Idle screw starting point

Joe Reeves' detailed instructions for adjusting the carb needles can be found on the "Engine Frequently Asked Questions" board.

It indicates that those procedures apply to 1980 and earlier motors. Is it different for this 1987?

 

[Daviet]

Re: 1987 Johnson 9.9 Idle screw starting point

According to the parts breakdown you have a low speed needle valve. 1 1/2 turn out is a static starting point with a final adjustment made in the water.

 

[the machinist]

Re: 1987 Johnson 9.9 Idle screw starting point

About midyear of 1987 the carburetors had plastic tops. At this time they used finer threads on the needle jet. I have found that for my 93, I start at 4 turns out & settled on 4 5/8.

 

[Rick.]

Re: 1987 Johnson 9.9 Idle screw starting point

About midyear of 1987 the carburetors had plastic tops. At this time they used finer threads on the needle jet. I have found that for my 93, I start at 4 turns out & settled on 4 5/8.

So this is how common knowledge is born!! Thanks for sharing that, and so much more. We are all learning. Rick.