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CV32mm on a GS750E

W

WillKov78

Forum Newbie
I'm trying to start my project bike and the carbs that I have are pouring gas out thought carbs 1 and 4. What I found is the fuel daisy chain connection on the outside of both carbs 1 and 4 are not plugged. I have 2 sets of carbs are both are the same. It looks like whatever was used to originally plug the holes deteriorated. Has anyone else run into this, if so what did you do? I measured the hole and it is 9mm ID, I was thinking of a plug but I was concerned with it falling out.
 
Number 1 and 4 carbs are not drilled for the fuel passages on the outboard side of the carbs. The carbs have a cast-in boss for the passage, but it's not drilled.
 
Each carb in the carb set is different and has a unique part number. If you look at the schematic posted above by Steve Murdoch, you'll see the carbs are numbered with a sequential prefix 13201-45400 through to 13204-45400. Due to the fuel connections, the blanked fuel gallery ends, float bowl vent connections (shared between 1 & 2 and between 3 & 4) and last but not least the vacuum feed from carb 2 for the fuel tap, they aren't interchangeable for position in the set. Pics of your carbs would help, but it sounds like your set might not be a 'set'.
 
Last edited:
WillKov78 said:
I'm trying to start my project bike and the carbs that I have are pouring gas out thought carbs 1 and 4. What I found is the fuel daisy chain connection on the outside of both carbs 1 and 4 are not plugged. I have 2 sets of carbs are both are the same. It looks like whatever was used to originally plug the holes deteriorated. Has anyone else run into this, if so what did you do? I measured the hole and it is 9mm ID, I was thinking of a plug but I was concerned with it falling out.
Click to expand...

The holes arent drilled so nothing deteriorated. As mentioned your carbs are either in the wrong place on the rack or you have several of the same position # carb. i.e. you have x2 - # 2 carbs.
Also, I have a set of VM26's with duel fuel taps or duel fuel inlets. Could this be the case with your rack?

steve murdoch - daisy chain is a term when things are hooked up in a row or through the same connection. Hence all inline 4 carb racks - the fuel delivery is daisy chained... hope this helps.
A string of Xmas lights would be an electrical example of daisy chained.
 
Number 2 and 3 are drilled on both sides of the carb. Maybe someone swapped in some of those to replace damaged 1 and 4?
 
Are you sure it’s not leaking from the two vent hose connections ….. One between 1 and 2 and another between 3 and 4?
 

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WillKov78 said:
I'm trying to start my project bike and the carbs that I have are pouring gas out thought carbs 1 and 4. What I found is the fuel daisy chain connection on the outside of both carbs 1 and 4 are not plugged. I have 2 sets of carbs are both are the same. It looks like whatever was used to originally plug the holes deteriorated. Has anyone else run into this, if so what did you do? I measured the hole and it is 9mm ID, I was thinking of a plug but I was concerned with it falling out.
Click to expand...

Could you provide a picture so we likely let you know what order your carbs should be in?

It sounds like you have 2 racks of 2-3 carbs somehow.
 
Strange thread. OP makes an unusual problem claim, but hasn't been back to the thread after several days?
 
I did come up with some plugs for the open holes, I'm pretty sure that you guys were right about 2 and 3's in place of 1 and 4 carbs. I got another set off of ebay and I'm in the process of jetting them now. Thanks for all of the advise.
 
We never know what's been done in the past. Glad you got it figured, and hoping headed in the right direction. Keep us updated.
 
The jetting is pretty close, about 1/3 throttle it burbles and is flat. I raised the needles some more and it helped some. I'm going to readjust the floats next. The service manual says to set them at 22.4mm +/- 1mm, I set them at 22.5mm. The funny thing is both sets of carbs I have the floats were set at 25mm, the tab was flush with the float arms. When I set them I had to bend the tab upwards (towards the bottom of the bowl) to set them at 22.5mm. I've jetted probably 50 or GS750, GS1100's, this one is strange. Although the bikes I jetted in the past were new and untouched bikes back in the 80's.
 
What are you doing to lift the needles? I hope you realize that putting washers under the clip does not lift the needle on GS CV carb bikes.
 
The trick to raising the needles is taking the white nylon spacer on the top and replace it using washers that add up to the same thickness. Once you have that you simply take some off of the top (above the clip) and place them below the clip. This is a trick that a Suzuki Tech rep told me years ago. If you just add washers below the clip it achieves nothing, you have to alter the thickness above the clip.
 
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