Tileman
Well-known member
Had problems with motor idleing,Mercury 20 hp, cleaned carb and got junk out. How do you adjust the idle needle???
IDLE NEEDLE ADJUSTMENT
- Thread starter Tileman
- Start date
Help Support Chattanooga Fishing Forum:
ditchdoc666
Well-known member
Hey Barry,give wreching2 a call or pm him he will tell you all you need to know about that little jewell
Bubbakat
Well-known member
Need to adjust carbs with the engine in the water =in gear- under a load
warm the engine up before you start your adjustments.
Start with all needles one turn open to adjust the engine to about 600 to 700 rpms
With the engine running in gear set the low speed mixture needle counter clockwise until affected cylinders start to load up
or fire unevenly due to an over rich mixture.
Slowly turn the needle clockwise until cylinders fire evenly and engine picks up speed.
continus turningclockwise until to lean of a mixture is abtained and engine slows down and misfires.
set needle 1/2 to 3/4 turn counter clockwise from lean out position to gain a good setting
Do not adjust any lower to attain reasonably smooth idling.
when in doube it is better to have the mixture set slightly rich rather then lean.
If enginehesitates during acceleration after adjustment, it is to lean and it should be enriched until acclerates properly
Idle engine and adjust idle stop screw on stop bracket until engine operates at the proper RPM in forward gear.
That would be about 1200 out of gear and about 600 to 700 ingear.
After adjustments you need to run it at wot to clear it out and then recheck you idle speed.
Hope this helps. Its easier for me to do then to write it out.
warm the engine up before you start your adjustments.
Start with all needles one turn open to adjust the engine to about 600 to 700 rpms
With the engine running in gear set the low speed mixture needle counter clockwise until affected cylinders start to load up
or fire unevenly due to an over rich mixture.
Slowly turn the needle clockwise until cylinders fire evenly and engine picks up speed.
continus turningclockwise until to lean of a mixture is abtained and engine slows down and misfires.
set needle 1/2 to 3/4 turn counter clockwise from lean out position to gain a good setting
Do not adjust any lower to attain reasonably smooth idling.
when in doube it is better to have the mixture set slightly rich rather then lean.
If enginehesitates during acceleration after adjustment, it is to lean and it should be enriched until acclerates properly
Idle engine and adjust idle stop screw on stop bracket until engine operates at the proper RPM in forward gear.
That would be about 1200 out of gear and about 600 to 700 ingear.
After adjustments you need to run it at wot to clear it out and then recheck you idle speed.
Hope this helps. Its easier for me to do then to write it out.
