Topic: CB 022A idle screw

[bloglos]

Would someone be so kind as to post a picture of their idle screw setup?  A friend gave me a set of carbs to rebuild but the idle screw comes no where close to touching the throttle linkage plate to move the slides up or down to set idle rpm.  Even when turned all the way in it's still about 1/4" away from making any contact.  I'm just wondering if he assembled them incorrectly.

Any help or advice is appreciated!

[Deltarider]

Have you consulted the genuine Honda Workshop Service Manual?
You can find it here (scroll down):  http://forums.sohc4.net/index.php?topic=17788.0

[bloglos]

Yes, I've read it over quite a bit and it makes no mention of the idle screw in the carb section. 

Have you consulted the genuine Honda Workshop Service Manual?
You can find it here (scroll down):  http://forums.sohc4.net/index.php?topic=17788.0

[TwoTired]

Each slide has it's own slide height adjuster.
With the idle screw backed out, the slides should rest on the "Floor" of its travel.

If they can't then the idle screw is useless/ineffective.

While "bench syncing" the carbs, the individual slide height adjusters, must be set so that the slides fully close, then the idle screw will be able to open all the slides and be effective at setting the idle speed.

[bloglos]

Currently, the slides are closed on all four carbs.  In order to do a bench sync, as I've read many places, want to turn the idle screw until one of the carbs can fit a 1/8" drill bit in.  Then I use the individual adjusters to match them up and then turn the idle screw back down so the slides aren't so open, I'm guessing the bikes RPM's would rise quite high otherwise.  My issue is that turning the idle screw doesn't raise the slides because it's not making any contact with the link arm which raises the slides.  I hope this makes sense, sorry if I've missed something in the response.

Each slide has it's own slide height adjuster.
With the idle screw backed out, the slides should rest on the "Floor" of its travel.

If they can't then the idle screw is useless/ineffective.

While "bench syncing" the carbs, the individual slide height adjusters, must be set so that the slides fully close, then the idle screw will be able to open all the slides and be effective at setting the idle speed.

[dave500]

you have to back the sync screws off and watch as the stopper returns to the idle screw.

[TwoTired]

Currently, the slides are closed on all four carbs.  In order to do a bench sync, as I've read many places, want to turn the idle screw until one of the carbs can fit a 1/8" drill bit in. 

There's the problem.  The slide's travel was limited by the 1/8" drill bit  (I am really starting to hate that viral folklore).
Have you checked that the slides are capable of fully closing...completely?

[bloglos]

Oh I see, I'll give that a go when I get home. I'll have to back each one off separately until the stopper on the link arm comes up to meet the idle screw?

you have to back the sync screws off and watch as the stopper returns to the idle screw.

[bloglos]

Yes, the slides are closed completely.  There is no bit in there, I'm just trying to get the idle screw to raise the slides up enough to bench sync it, but the idle screw doesn't make any contact with the stopper on the link arm, which in tern raises the slides..

I'll just post a pic when I get home...  I'm probably describing it wrong.

Currently, the slides are closed on all four carbs.  In order to do a bench sync, as I've read many places, want to turn the idle screw until one of the carbs can fit a 1/8" drill bit in. 

There's the problem.  The slide's travel was limited by the 1/8" drill bit  (I am really starting to hate that viral folklore).
Have you checked that the slides are capable of fully closing...completely?

[lucky]

What year is this motorcycle?
How many cc'c?

Can you post any photos?

[Deltarider]

Yes, I've read it over quite a bit and it makes no mention of the idle screw in the carb section.

You have checked Maintenance Operations p8-10, have you?

[lone*X]

Lucky,  their 022A's as in the OP's first post and title.  Do your homework.  Surely you know what these fit.

[bloglos]

CB550 74.  I'll post some photos right now.

What year is this motorcycle?
How many cc'c?

Can you post any photos?

[bloglos]

Yes I've read it. It mentions the throttle stopper and the overtravel stopper, the overtravel stopper comes no wear close to touching anything.. pics coming up.

Yes, I've read it over quite a bit and it makes no mention of the idle screw in the carb section.

You have checked Maintenance Operations p8-10, have you?

[bloglos]

Hope this works.. I've attached some pics...

CB550 74.  I'll post some photos right now.

What year is this motorcycle?
How many cc'c?

Can you post any photos?

[bloglos]

I hope this shows that when I turn the idle screw all the way in, it makes no contact with anything... so If I ran the carbs this way then I have no control over the idle, as it won't raise or lower the slides.

I'm sure I'm missing something very simple that my inexperience is making me miss.

[Deltarider]

Wait a minute... is that spring supposed to be there? I don't believe I have one there. I have one under the throttle grip at the handlebar. Why not get rid of that spring and the adjuster bolt can travel more.

[bloglos]

I think so, from the diagrams I've looked at it's supposed to be there.. It's not restricting the full range of the idle screw.  That's as far as it goes with or without the spring.

Wait a minute... is that spring supposed to be there? I don't believe I have one there. I have one under the throttle grip at the handlebar. Why not get rid of that spring and the adjuster bolt can travel more.

[Deltarider]

You're probably right. It's in the picture in the Parts List all right. Just can't remember having seen it on mine. Anyway, will check it when I'm downstairs.

[lucky]

I hope this shows that when I turn the idle screw all the way in, it makes no contact with anything... so If I ran the carbs this way then I have no control over the idle, as it won't raise or lower the slides.

I'm sure I'm missing something very simple that my inexperience is making me miss.

The photos tell the story very well thanks.
First photo shows the BACK of the slide is not all the way down.
That means the slide on that carb and maybe others are holding the throttle open.

FIRST back off the idle screw a little more for right now.

You need to take the tops of all the carbs off.
Make sure #2 carb slide is all the way down and them measure from the top of the slide to the top of the carb body with calipers. Now make cylinders #1.#3,and #4 all the same.

Before you put the carbs back on make sure all of the mixture screws are adjusted the same amount.

At this time the idle screw can be adjusted.

Now the engine can be started get it to idle and sync the carbs.

[bloglos]

This is the part I don't understand how to do, sorry. You say,  "Make sure carb#2 is all the way down" and  "make cylinders #1 3 and 4 the same".  Do I use the individual syncing screws to do this?  Also, what purpose do the hex bolts beside the syncing screws serve?

You need to take the tops of all the carbs off.
Make sure #2 carb slide is all the way down and them measure from the top of the slide to the top of the carb body with calipers. Now make cylinders #1.#3,and #4 all the same.

Before you put the carbs back on make sure all of the mixture screws are adjusted the same amount.

At this time the idle screw can be adjusted.

Now the engine can be started get it to idle and sync the carbs.

[TwoTired]

The first pictured confirmed what I've been telling you all along.  The slides do NOT bottom in the bores.
Your carbs do not have a master carb, #2 is like all the rest and part of the reason they can be assembled incorectly.
Further, the slide adjusters on the carb are outside the top caps.

The slide travel was adjusted for a 1/8" opening and you still have some of that left after the slide positions were corrupted.

Ok, one more time, then you are on your own.

Back out the big idle knob.
Pick a carb, any carb, and adjust the slide position so that it will floor in the bore. (Maybe even an extra twist of the adjuster.)  Now lock that adjuster down and don't ever adjust it again.  Designate that carb as the "master" carb.

Now you can bench sync the others to be the same as your "master" either on the bench or with vacuum gauges later.
The big idle knob will now take the slide off the "floor" so that the engine can achieve and idle speed. If not, you'll have to go back and change the slide travel at the master's position, and go through the process all over again.

Good luck!

[dave500]

have you got a return spring here?this one is off at the moment,you should also have a spring between these points shown.

notice the sync screw with the locknut backed off how much thread is poking up?this is in the ball park,yours may be wound down much further?

[lucky]

The first pictured confirmed what I've been telling you all along.  The slides do NOT bottom in the bores.
Your carbs do not have a master carb, #2 is like all the rest and part of the reason they can be assembled incorectly.
Further, the slide adjusters on the carb are outside the top caps.

The slide travel was adjusted for a 1/8" opening and you still have some of that left after the slide positions were corrupted.

Ok, one more time, then you are on your own.

Back out the big idle knob.
Pick a carb, any carb, and adjust the slide position so that it will floor in the bore. (Maybe even an extra twist of the adjuster.)  Now lock that adjuster down and don't ever adjust it again.  Designate that carb as the "master" carb.

Now you can bench sync the others to be the same as your "master" either on the bench or with vacuum gauges later.
The big idle knob will now take the slide off the "floor" so that the engine can achieve and idle speed. If not, you'll have to go back and change the slide travel at the master's position, and go through the process all over again.

Good luck!

TWO TIRED seems to know this carb very well. I would follow his instructions.
If he says this is the last time he will tell you.
 Just go back and read it as many times as you want. LOL//lol