Carb Synch

[Guest]

I'd appreciate anyone's help on this.

I have a 1982 GS1000. I've read that people bench synch the carbs using a paper clip or piano wire. I can't get my carbs to close up that close. I could almost fit a pencil below the slide. What am I doing wrong?

Thanks

[60ratrod]

have you run the idle adjustment knob on the bottom between carbs 2 & 3 all the way down? sounds like you have the knob ran all the way in.

[Steve]

And, rather than use some arbitrary piece of hardware that might not get positioned EXACTLY the same from one carb to the next, why not just close them down as far as you can, but still leave a sliver of light around the edge?

By bench synching with the "sliver of light" method, I have gotten VERY close on the vacuum sync.

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[Wingsconsin]

And, rather than use some arbitrary piece of hardware that might not get positioned EXACTLY the same from one carb to the next, why not just close them down as far as you can, but still leave a sliver of light around the edge?

By bench synching with the "sliver of light" method, I have gotten VERY close on the vacuum sync.

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From Steves Photos

[Steve]

Thanks, Wing. I am at work, don't have access to my photos.

EDIT: just checked out, I'm heading for home.

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[Katarat]

I use a piece of piano wire & turn the idle screw until it just releases from #3, then adjust the others with the 8mm size lock nut & screw the same so the wire just releases. That's pretty close to start with and do the running synch or run it like that if you don't have the tools

[tkent02]

I vote for the sliver of light method.

[Marty]

I bench sync'd a few weeks back using just closing them and feeling when they bottomed out, I was surprised how close I got them - only one required less than half a turn adjustment.

However - I only consider it a starting place as you should always vacuum sync with gauges asap to get the engine running smoothly and evenly

[BigVic54]

My carbs have a slide and not a butterfly. Should they be all the way down?

[Steve]

My carbs have a slide and not a butterfly. Should they be all the way down?

If you have stock carbs, there is a butterfly.

If you look in from the airbox side, you WILL see a slide, but between that and the exit of the carb into the intake runner, there is a butterfly. It will look a LOT like the picture that Wingsconsin posted in post #4.

The slides that you see are essentially a "variable venturi". The opening under that slide is controlled by vacuum which is generated by the amount of air rushing under the slide. At rest, there will be at least 1/4" of space under the slide.

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[BigVic54]

image.jpgThese are my carbs. No butterfly.

[bikemtn]

The butterfly is on the intake side of the carbs......this photo is of the opposite side.

[Steve]

These are my carbs. No butterfly.

Read post #10.

Then look at the picture in post #4.

If you don't believe us, I will give you a link to the pictures in the Suzuki factory manual.

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[BigVic54]

I believe you. So I'm going to have to take them off to bench sync them. Or use a carb sync.

Should the the slides be adjusted?

[bikemtn]

Take them off....and dip, new orings, bench sync per http://members.dslextreme.com/users/bikecliff/. Follow the carb rebuild link found on bikecliff's awesome page.