carb adjustment

[metalrain]

Did a little tuning on my 1450 yesterday, the k321 runs fine, but noticed when I tried to adjust the low idle needle, I could turn it all the way in or out with no noticeable difference either way....is that normal?

metalrain

[ol'George]

Originally Posted by metalrain

Did alittle tuning on my 1450 yesterday, the k321 runs fine, but noticed when i tried to adjust the low idle needle i could turn it all the way in or out with no noticeable difference either way....is that normal?

metalrain

No, it usually indicates the passage is plugged or you have a vacuum leak, possibly around the throttle shaft?
Normally when the engine is @ dead idle, you should be able to kill the engine with a turn either direction from the present setting.
Count the turns from seated,remember it, then remove the needle and blow a shot of compressed air in the needle hole and replace the needle and try it.
sometimes that will work.
But if it is running correctly @ idle, I would not be too concerned.
Can't remember the setting but a 1-1/2 turn shouldn't be two far away.
that usually is a good place to start.
I'm sure others will chime in also.

[metalrain]

Thanks George;

Did a major clean job on it....dipped and soaked it...sprayed carb cleaner thru everything today (again)...A few weeks ago i overhauled it, did the throttle shaft repair. Only thing i noticed that wasn't quite right, the throat of the carb was alittle wallowed out where the throttle butterfly sits. It still seems to run fine, just can't get anything to change when turning in the low idle screw..i'm thinking the out of round throttle body has something to do with it...

metalrain

[ol'George]

Originally Posted by metalrain

Thanks George;

Did a major clean job on it....dipped and soaked it...sprayed carb cleaner thru everything today (again)...A few weeks ago i overhauled it, did the throttle shaft repair. Only thing i noticed that wasn't quite right, the throat of the carb was alittle wallowed out where the throttle butterfly sits. It still seems to run fine, just can't get anything to change when turning in the low idle screw..i'm thinking the out of round throttle body has something to do with it...

metalrain

The idle air screw provides a air bleed around a closed butterfly.
if the bore is not being closed tightly by the butterfly, due to wear, that probably would cause your lack of adjustment.
If you take the needle completly out while @ idle, it should stall, unless something is really amiss.
Also if you have a lot of butterfly opening determined by the idle rpm screw, it will diminish the air bleed screw effect somewhat
But if it is running sweet, I would not worry/fool with it.

[metalrain]

Now that you mention it George, i think i might have the idle rpm screw holding the butterfly open just a bit...didn't think of that, i'll check it in the morning...Thanks

metalrain

[ol'George]

Originally Posted by metalrain

Now that you mention it George, i think i might have the idle rpm screw holding the butterfly open just a bit...didn't think of that, i'll check it in the morning...Thanks

metalrain

It is suppost to hold it open a bit, just so they compliment each other, not override each other.
Set the air, then adjust the butterfly, then tweak the air again.
After you do it a few times it becomes second nature.