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Author Topic: CB350G High Idle? (vid inside)  (Read 3129 times)

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Righteous Wallace

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CB350G High Idle? (vid inside)
« on: May 15, 2009, 04:12:23 PM »
Hey guys,

Just got done installing a new float on the left carb, and now it idles really high...at 2k. Is this normal for these bikes (i bought it with a bad float, so this is the first time it's run right since i've had it)? If not, what do i need to do? Start with the idle adjustment screw? If so, how do i get both carbs adjusted the same amount? Thanks!

Here's a video
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Offline kghost

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Re: CB350G High Idle? (vid inside)
« Reply #1 on: May 15, 2009, 05:00:25 PM »
No its not normal.

Make sure the carbs are balanced.
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Righteous Wallace

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Re: CB350G High Idle? (vid inside)
« Reply #2 on: May 16, 2009, 01:10:02 AM »
Any more info? How do i balance them?
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Righteous Wallace

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Re: CB350G High Idle? (vid inside)
« Reply #3 on: May 16, 2009, 03:25:20 PM »
Bump. Can anyone help?
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Offline martino1972

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Re: CB350G High Idle? (vid inside)
« Reply #4 on: May 16, 2009, 03:54:26 PM »
I pulled this off an old thread here,might help ya....also the link is to the thread here where you can download the shop manual for your bike....

quote:
As it has been said, the carbs have no provision for synchonizers. The carbs have basically two adjusters: the idle screw, and the butterfly stop screws, used for synchronization.

First thing I would do would be to loose the throttle cable adjusters so the cable has some slack -to make sure it is not forcing open the butterflies-, and open the butterflies screw to make sure they are in the fully seated position. Set the idle screws to whatever the standard position is -I can't remember, say 1 and a half turns from closed-, and start the bike. It should idle smoothly. Now adjust the throttle cable so they pull at the same time when twisting the grip, making sure there are a couple of mm of slack. The butterfly adjusters are used to synchronize the carbs, and with no provision for gauges, it should have to be done by ear and feel. If the bike stalls when revving, means there is a problem in the transition from idle to low, so you will probably have to use the butterflies adjusters to slightly open and slightly close the idle screw, this way compensating the fuel intake in idle but favouring the butterfly circuit.





okay,and here is the link to the manuals....:
http://forums.sohc4.net/index.php?topic=17788.0
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Offline mlinder

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Re: CB350G High Idle? (vid inside)
« Reply #5 on: May 16, 2009, 03:55:36 PM »
Quote from: Righteous Wallace on May 16, 2009, 03:25:20 PM
Bump. Can anyone help?

With a carb synch tool.
I can't remember if/where the spigots are on the carbs/boots on that bike.

You should probably ask to have this moved to the 'other bikes' section,  might get a bit more info, as the rest of the forum is for SOHC4's... which the 350g is not :)
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Offline mlinder

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Re: CB350G High Idle? (vid inside)
« Reply #6 on: May 16, 2009, 03:57:12 PM »
Ah, as martino said, no provision for s synch tool on the twins.
Doesn't mean you couldn't do a number on the carb boots to make it possible. It's what I'm doing on my 350t
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Righteous Wallace

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Re: CB350G High Idle? (vid inside)
« Reply #7 on: May 17, 2009, 12:38:45 PM »
Quote from: martino1972 on May 16, 2009, 03:54:26 PM
I pulled this off an old thread here,might help ya....also the link is to the thread here where you can download the shop manual for your bike....

quote:
As it has been said, the carbs have no provision for synchonizers. The carbs have basically two adjusters: the idle screw, and the butterfly stop screws, used for synchronization.

First thing I would do would be to loose the throttle cable adjusters so the cable has some slack -to make sure it is not forcing open the butterflies-, and open the butterflies screw to make sure they are in the fully seated position. Set the idle screws to whatever the standard position is -I can't remember, say 1 and a half turns from closed-, and start the bike. It should idle smoothly. Now adjust the throttle cable so they pull at the same time when twisting the grip, making sure there are a couple of mm of slack. The butterfly adjusters are used to synchronize the carbs, and with no provision for gauges, it should have to be done by ear and feel. If the bike stalls when revving, means there is a problem in the transition from idle to low, so you will probably have to use the butterflies adjusters to slightly open and slightly close the idle screw, this way compensating the fuel intake in idle but favouring the butterfly circuit.





okay,and here is the link to the manuals....:
http://forums.sohc4.net/index.php?topic=17788.0
Thanks for the info! And now that i remember, i believe i messed with the cable adjuster on the carb when i tried to take the carb off the first time (i didn't see that the bracket could be unscrewed). I'm gonna try this when i have a chance.

Also, i've seen that FAQ thread about the manuals, but i don't see anything about 350 twins :(
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Offline Hush

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Re: CB350G High Idle? (vid inside)
« Reply #8 on: May 17, 2009, 12:46:23 PM »
Probably cos the SOHC4 site is for Single Overhead Cam 4 cylinder bikes mate...........but we are a cheerful helpful lot. :D
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Offline kghost

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Re: CB350G High Idle? (vid inside)
« Reply #9 on: May 17, 2009, 12:53:39 PM »
Sorry I missed this in my unreads....

I have a 450 and believe the procedure is basically the same....

Click on the pic below....for the 450 procedure and pic's

« Last Edit: May 17, 2009, 01:02:00 PM by kghost »
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Righteous Wallace

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Re: CB350G High Idle? (vid inside)
« Reply #10 on: May 17, 2009, 01:11:00 PM »
Quote from: Hush on May 17, 2009, 12:46:23 PM
Probably cos the SOHC4 site is for Single Overhead Cam 4 cylinder bikes mate...........but we are a cheerful helpful lot. :D
Haha i know that, but i've seen a good amount of info and discussions on twins, so why not throw that on there as well? :P

Quote from: kghost on May 17, 2009, 12:53:39 PM
Sorry I missed this in my unreads....

I have a 450 and believe the procedure is basically the same....

Click on the pic below....for the 450 procedure and pic's


Thanks! Do you happen to have the manual saved as a file?
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Righteous Wallace

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Re: CB350G High Idle? (vid inside)
« Reply #11 on: May 17, 2009, 01:18:26 PM »
Btw can someone report my original post to a mod and have this moved to "Other Bikes" sub-forum please? Thanks!
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Offline kghost

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Re: CB350G High Idle? (vid inside)
« Reply #12 on: May 17, 2009, 01:20:54 PM »
http://www.hondatwins.com/pdf/CB350-%20MANUAL.pdf

350 manual is available from Honda twins....

I have the 450 manual but its 18 mb
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Offline martino1972

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Re: CB350G High Idle? (vid inside)
« Reply #13 on: May 17, 2009, 01:26:00 PM »
maybe would be a good idea to add that link to the other bike section under a pin.???
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Righteous Wallace

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Re: CB350G High Idle? (vid inside)
« Reply #14 on: May 17, 2009, 02:29:56 PM »
Quote from: kghost on May 17, 2009, 01:20:54 PM
http://www.hondatwins.com/pdf/CB350-%20MANUAL.pdf

350 manual is available from Honda twins....

I have the 450 manual but its 18 mb
It's not loading up, but thank you very much for that link! Now i can post all my problems and questions on there :P

Edit: Ok it loaded. Thanks :)
« Last Edit: May 17, 2009, 02:34:37 PM by Righteous Wallace »
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Offline DollarBill

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Re: CB350G High Idle? (vid inside)
« Reply #15 on: May 17, 2009, 02:53:48 PM »
Here's another link: http://www.classiccycles.org/honda_manuals_60s_70s.html

The file is large so right click on it and choose 'Save file as'.  If you wait for it to load in your browser it will take a long long time.

I have a 350G as well and you want to make sure that both carbs move at the same time when you twist the throttle.  Like Martino described.  That'll get you really close.  There are always other variables to consider.  If the exhaust is not stock....if you are using pods as opposed to the original air box.  In my case it took me three weeks of adjusting and cleaning the carbs to finally realize the previous owner was using jets 3 sizes larger than stock.  You might give that a check just to be sure....rejetting is popular.

Good luck with it!  They are fun little bikes!
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Spillman

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Re: CB350G High Idle? (vid inside)
« Reply #16 on: May 17, 2009, 04:43:01 PM »
need adobe to view it. once you download adobe shouldn't have a problem
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Righteous Wallace

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Re: CB350G High Idle? (vid inside)
« Reply #17 on: May 17, 2009, 06:47:51 PM »
Quote from: Spillman on May 17, 2009, 04:43:01 PM
need adobe to view it. once you download adobe shouldn't have a problem
Lol, i'm aware of what a pdf file is :P. It just wasn't loading the first time, but did load the second time i clicked on the link.

Anyways, i got it fixed. I messed with the butterfly screws to adjust the idle, brought it down to 1100rpms. And also synced the carbs to the closest i could by feel and sight. She's good to go! :)

Thanks again fellas!
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Offline martino1972

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Re: CB350G High Idle? (vid inside)
« Reply #18 on: May 17, 2009, 09:59:57 PM »
NO,your not done...

you need to make a video of the result..... ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D
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Marti, I want you to know, I like you an awful lot, but guys have said far less and left wearing their drinks on their shirts.
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Offline kghost

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Re: CB350G High Idle? (vid inside)
« Reply #19 on: May 18, 2009, 12:52:34 AM »
Classic Marti  ;D ;D :D
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Righteous Wallace

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Re: CB350G High Idle? (vid inside)
« Reply #20 on: May 18, 2009, 04:51:33 AM »
Quote from: martino1972 on May 17, 2009, 09:59:57 PM
NO,your not done...

you need to make a video of the result..... ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D
Hahahaha, funny part is....i actually almost did :P

But maybe i will after work today!  8)
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