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Idle Adjustment Screw Configuration

cowboyup3371

cowboyup3371

Forum Guru
Past Site Supporter
When Tkent02 and I recalibrated my carbs in Denver a few months ago (about 1200 feet lower than where I'm at), the bike ran pretty good. However, since then the bike will die at a low idle. Orings are brand new (replaced in August) and the valve adjustment was also done at the same time. All other times, the bike runs great. Air screws (at top of carbs) are set as follows:

#1 - 2 turns
#2 - 1 turn
#3 - 1 turn
#4 - 2 turns

Also just for note, my pilot jets are 40 and main jets are 92.5

I already plan on redoing the air screws when everything else is set and back on the bike in the spring. However, one of the things I noticed when the bike would die is the low idle speed - around 900. So, I would raise the idle adjustment screw to 1100 and things would be fine until the bike warmed up. Then the idle would drop back to 900.

At the time, Steve recommended I look at my idle adjustment screw and see if maybe something was wrong with the spring that is on this screw. Well, I finally had time to take it off the carbs today and this is what I'm finding. I looked over the parts fiche for my carbs but the pictures still leave a bit to be guessed at. Could someone else please look at these pictures and tell me if I have everything in the right spot?

Bottom view

idleadjustmentscrewbottom.jpg


Top view

idleadjustmentscrewtop.jpg


Thanks all
 
Well, sir, the good news is that the idle screw assembly is correct. :clap:

More good news, the jets are stock sizes. :clap:

The mixture screw settings sound a little lean, but you are up a bit in elevation. :-k

What puzzles me, though is the great difference between the inner and outer carbs.
It is not unusual to have different settings, but those are a LOT different.

When you get them back together, I would suggest starting with them out a bit farther, then leaning them bit by bit to achieve best mixture.
Down here, closer to sea level, many of us start at three turns out, you might be OK starting at 2 1/2.

One way to judge the approximate idle mixture is to 'blip' the throttle and note how it slows back down.
If it slows down quickly, goes below the idle speed, then comes back up, it's running a bit rich.
If it hangs a bit and returns slowly, it's running a bit lean.

.
 
Thank you Steve good to know. I'll work on those screws when I put everything back on the bike soon.
 
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