1992 Johnson 120HP idle/low speed issue

[joeltjen10]

I am running a '92 Johnson J120TLAND. I've had some issues with my motor sputtering and killing when running at low speeds or idle. However, this only happens when my engine is trimmed down. I give a little more throttle or trim the motor to prevent it from happening.

I cleaned and rebuilt my carbs this year and checked for level on the floats. The results have been the same before and after. I also check the spark plugs and they seemed a bit black so I've replaced those as well.

Next steps will be to adjust the floats and have them sit a little high and I'll pull the new spark plugs to see if they are still black and oily.

Is there anything else I should be looking at or testing while I have it pulled apart to resolve this idle/trim issue?

 

[oldboat1]

What was your carb cleaning procedure?

 

[Faztbullet]

Did you install the plastic washer under inlet needle? If so it needs removed .

 

[joeltjen10]

What was your carb cleaning procedure?

1. I removed carbs, float bowl, needle, gaskets and anything else needed.
2. Sprayed down every opening with a carb cleaner
3. Let it sit for a few minutes
4. Drained all the carb cleaner
5. Sprayed it with air in every opening.
6. Re-assembled it in reverse.

 

[joeltjen10]

Did you install the plastic washer under inlet needle? If so it needs removed .

I don't believe I did but will check when check the floats.