Idleing at 2000 RPM

capricuddy92

Cadet
Joined
Jun 21, 2017
Messages
29
Hey, guys, I have a 1990 Bayliner Capri with a 1990 120 hp Force outboard.

I just put on a new prop, throttle cables and finally, a tach (20 pole was fun to find) and I want to make sure my motor is performing correctly.

She starts up at 1800-2000 RPM in neutral, I was hoping someone can point out how to lower the throttle (750 i heard is correct ) without screwing up the carbs. I believe under the flywheel there is the control arm and an adjuster screw, but I was hoping someone can put in dummy terms what I should adjust, please.

Any help would be great!
 

jimmbo

Supreme Mariner
Joined
May 24, 2004
Messages
12,944
How fast did it idle before you replaced the Throttle cable?
 

jerryjerry05

Supreme Mariner
Joined
May 7, 2008
Messages
17,923
On the bottom of the towershaft is the idle set screw..
7/16 nut and a slotted screw.
Loosen the nut and UNSCREW the screw.
That will drop the rpm's

You need to set the idle in the water and in gear, not on a trailer or tied to a dock.
750-800 is what your looking for.
On the hose, 1200 +- 50 Then set in the water.

DO NOT TOUCH THE CONTROL ARM.
That for setting the timing.
 

capricuddy92

Cadet
Joined
Jun 21, 2017
Messages
29
On the bottom of the towershaft is the idle set screw..
7/16 nut and a slotted screw.
Loosen the nut and UNSCREW the screw.
That will drop the rpm's

You need to set the idle in the water and in gear, not on a trailer or tied to a dock.
750-800 is what your looking for.
On the hose, 1200 +- 50 Then set in the water.

DO NOT TOUCH THE CONTROL ARM.
That for setting the timing.

I had to replace a small black plastic piece that the bole screws into at the top of the control arm. It is right under the fly wheel, and how I moved it does control the idle it would appear. Since I had to replace it, it is probably off from what it should be. Is that the timing control that I SHOULD NOT have touched?
 

jimmbo

Supreme Mariner
Joined
May 24, 2004
Messages
12,944
750 sounds a little high for an in gear idle speed. 600 - 650 was a more common figure
 

jerryjerry05

Supreme Mariner
Joined
May 7, 2008
Messages
17,923
Yes that's the no touch part.
If you replaced it and came close in replacing the part?
You should be close on the timing.
One of the first 4 posts has a post about timing, called a linc and sinc
You can check the static timing from these posts too.

Nope 750-800 in gear in the water.
Any lower they run the risk of stalling and falling on their face on take off.
 
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