Idle mixture adjustment (air or fuel screw adjustment)

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How to adjust the air or fuel screw on a typical motorcycle or ATV carburetor. Typical proceedure to adjust the idle mixture on a carburetor.

Category:

Howto & Style

Tags:

• air
• fuel
• screw
• adjustment
• jetting
• motorcycle
• atv
• carburetor
• carb
• ratio

[kingwii2000]

I have a 350 warrior and i had a problem with fuel leaking out of the bottom overflow of the carb, so i took the carb out cleaned it and cleaked the floats.The floats were fine and puting it back together seemed to stop the leaking accept now the warrior idels at an isanly high rate. adjusting the idel screw does nothing same with the AF screw. My freind messed up the adjustment of the thottle on the carb but other than that. I just cleaned it with carb cleaner, reesmbled it and now this. HELP!

[thejunkman]

@kingwii2000 First adjust the throttle cable to have aprox 1/8 inch of play then adjust the idle speed screw. I would have replaced the floats as they could be suspect of leaking/cracking alowing them to sink and overflow the carb.

[Sk8rBoi4Lfe]

hey i need some help.your video helped me out alot. but im just wondering. my bike takes alot of kicks to start up but when it does i need to rev it alot or else it will die. im just wondering. would adjusting the idle help me out? and if so how would i do it exactly?

[thejunkman]

@Sk8rBoi4Lfe The idle is very simple. Find the screw that controls the idle speed (usually on the side in the middle of the carburetor) For example the idle speed screw is the screw with the black knob in the video. Turn the screw in until the RPM's raise. However if the thing won't idle at all you probably have a dirty pilot circuit.

[ThugsRmorons]

2:50 You said it took "hours and hours of testing" to get the proper a/f mixture for the idle, but a few turns of the screw, and a few twists of the throttle seems to set things up rather quickly?

Was there something else that you were tackling that took hours and hours?

[thejunkman]

@ThugsRmorons Ahhh, the beauty of the editing room. Actually I already knew where my optimal setting was for this particular engine setup, but when I built the engine and bought the carb it took hours and hours of testing to get the jetting right so it would start and run without either bogging or overheating. It was trial and error with different components to get this engine to run well. This is just a demonstration.

[thejunkman]

@ROBOTNINJA500 Thanks for watching! Like my facebook page for more tips and tricks like this.

[ROBOTNINJA500]

i had stumbled across the information written a few days ago but this video was good just for practical experience :)

[thejunkman]

@DRMusicRoom No, this video only shows how to adjust the idle mixture (air/fuel). The idle speed is an entirely different adjustment. The idle speed is adjusted by a different screw that is basically an adjustable stock for the carburetor slide. It has nothing to do with adjusting the air/fuel mix at idle.

[DRMusicRoom]

@thejunkman So we should keep the tension of the throttle cable, when doing this, between loose and tight in order to adjust the idle speed using the idle screw? Thanks for the video.