You adjust idle with idle timing
== Is this engine the plastic cowling with idle knob and choke knob on the front pull it to choke and turn to raise idle? = Read more: http://www.justanswer.com/questions/1dpbt-25-hp-mercury-outboard-water#ixzz0HH1RenQM&B
outboard motor will start and idle, but dies out under load
The idle is not adjustible. You may need to clean the throttle plate to improve the idle.
If your engine has a carburettor turn the idle adjust screw so the idle is at the proper speed. If your engine has fuel injection the ECM controls the idle.
Right at the top of the engine you will find the carb immediatley to the right on the carb you will see a flat head screw this will adjust your idle , helps to have a second person on this.
To find the idle adjust on a caterpillar 3406 engine refer to the owners manual. If this doesn't help, contact the manufacturer.
You adjust the run and idle speed with the governor wire...loosen the nut and adjust it.
How do you adjust the idle speed on a citroen berlingo 1.9d (basic diesel engine)
carburetor or spark plugs
Idle speed is set by the PCM and IS NOT ADJUSTABLE.
You can't - it's all controlled from the PCM.