Raising my idle on a Lehman 120

TJM · Jul 18, 2019

Hello All:
One of my engines has an idle that is around 500 RPM which causes my engine to stall sometimes, mostly when docking.
I have tried AD and they have responded quickly but with pictures of a Minimec injector pump that I do not have.
My pump is a Minimec CAV but I do not have "adjusting" screws on either side of the pump. The pictures they sent have a vertical bar with two horizontal adjusting screws with locknuts to restrict the arm movement that controls the fuel from the throttles.

How do I raise my RPM ?

Ski in NC · Jul 18, 2019

Post some pics of your injection pump.

syjos · Jul 18, 2019

Either at the engine or control by adjusting the nuts on the throttle cable.

If you have the Morse dual lever control, there are adjustment screws under the plate on top where the idle can be sped up or down. If the adjustment screws are not long enough to get the speed up, replace with a longer screw.

SeaBreeze · Jul 18, 2019

What is the recommended idle speed in neutral? Is it + or - 650 ?

syjos · Jul 18, 2019

To reduce vibration, an idle speed between 650 and 800 was recommended by AD.

I have mine at 700.

jleonard · Jul 18, 2019

My manual says 600-700.
Mine is around 575.

Airstream345 · Jul 18, 2019

This reminds me I need to adjust my port engine idle speed.

alormaria · Jul 18, 2019

Just above where the doors and drawers rattle open.

Xsbank · Jul 18, 2019

That’s the correct answer, also add not so high that you hammer the damper plate when you shift.

Raising my idle on a Lehman 120

TJM

Senior Member

Ski in NC

Technical Guru

syjos

Guru

SeaBreeze

Senior Member

syjos

Guru

jleonard

Guru

Airstream345

Guru

alormaria

Guru

Xsbank

Guru

Similar threads

Latest posts