Carb rebuild: pilot screw adjustment? - Honda Rebel Forum

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Old 05-23-2012, 10:21 PM   #1
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Carb rebuild: pilot screw adjustment?

When I rebuild the carb, how do I adjust the pilot screw? Turn it in all the way? Back it out a certain number of turns?

Also, I just noticed that the washer between the spring and the o-ring is missing. How critical is this part?
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Old 05-23-2012, 10:41 PM   #2
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You will need to replace the washer. The screw should be turned out 2 1/4 turns to start with and fine tune it from there when it's all back together and running.
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Old 05-23-2012, 11:25 PM   #3
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What am I looking for / listening for when I "fine tune"? Any idea what size the washer is? Is it off-the-shelf hardware store size or specialized Honda size?
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Old 05-23-2012, 11:33 PM   #4
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You will listen for the idle to drop, when it drops turn it back to where it was before it dropped. Sometimes it is very subtle and hard to hear, also pay attention to how smooth or rough it is idling also. I'm not sure of the size of the washer, your Honda dealer will probably have one and it shouldn't cost much. The hardware store may have one also, I just don't know what size to tell you to get.
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Old 05-24-2012, 06:00 AM   #5
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Without the washer, there won't be enough tension on the spring to hold the screw in place. The washer is just a wee bit larger in diameter than the spring. I found one the correct inside diameter and turned it down with a Dremel grinding stone. Put washer on a nail, clamped nail in vise, oiled the nail to minimize wear on the washer, and began grinding. Check for fit frequently.
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Old 08-22-2013, 12:56 PM   #6
 
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Quote:
Originally Posted by sqb View Post
What am I looking for / listening for when I "fine tune"? Any idea what size the washer is? Is it off-the-shelf hardware store size or specialized Honda size?
According to the book, start with 21/4 turns out, adjust idle with the black idle screw so the RPMs are 1400 +/- 100. Turn pilot screw in and out until you have the highest RPMs. Readjust to 1400. Then turn the pilot screw in until the RPMs drop 50 RPMs. Readjust to 1400 and you should be good to go. Requires a tack to get it right but I suppose you could do it by ear.
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Old 08-22-2013, 01:03 PM   #7
 
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Somewhere on this forum is a thread with the Honda Service Manual idle drop carb adjusting procedure attached. Found IT!! See post # 3.

fuel mixture screw vs idle stop screw
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Old 08-23-2013, 09:43 AM   #8
 
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Quote:
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According to the book, start with 21/4 turns out, adjust idle with the black idle screw so the RPMs are 1400 +/- 100. Turn pilot screw in and out until you have the highest RPMs. Readjust to 1400. Then turn the pilot screw in until the RPMs drop 50 RPMs. Readjust to 1400 and you should be good to go. Requires a tack to get it right but I suppose you could do it by ear.
Two corrections to my above quote tack = tach and after the drop of 50 RPMs you should turn the screw out one full turn, THEN reset to 1400 RPMs.
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Old 04-06-2014, 01:56 AM   #9
 
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i assume this means to finger tighten the pilot screw then back it out 2 and a quarter turns?

thanks
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Old 04-06-2014, 03:09 AM   #10
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Quote:
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i assume this means to finger tighten the pilot screw then back it out 2 and a quarter turns?

thanks
Second generation Rebs have a different carb. On those you finger tighten it, then open it 2 and 3/4 turns. This is according to the Honda manual.
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