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How do I ID carbs?

  • Thread starter Thread starter mike63078
  • Start date Start date
M

mike63078

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Hello all I have been working on a 1980 GS850G. I have all the wiring togeather, good compression, good spark so all i need is fuel. Well my issue is it appears I have the wrong carbs. I went to bolt up the carbs last night and they are too narrow. Is there anyway I can tell what carbs I have and it there is anyway to make them work?

This is a low budget project.

Thanks
 
Yes, post up some pictures of those carbs

Then we can see what you have

A 1980 850 should have BS 32's (aka CV) carbs
 
how so I attach a photo on here?

also it appears they would work but they are not spaced out correctly. I can get 2 of them to line up but not the other 2

let me know of any thoughts on this

thanks
 
Did you replace the o-rings and rubber flanges?

LH and RH boots (rubber flanges) will be different, possibly they are on wrong?

CV carbs will have a round with square flange top-4 screws, VM style carbs will have an elongated top-three screws, unless they are VM33s they will have 2 screws on the tops which are flat mostly. VM33s should fit where BS32s will, but the rubber flanges need to be installed correctly. VM26-VM28orVM29s the spigot is too small for the BS32 rubber flanges, and can be spaced differently. 2 outside match up, 2 inside sometimes dont. ;)

E
 
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tejasmud said:
Did you replace the o-rings and rubber flanges?

LH and RH boots (rubber flanges) will be different, possibly they are on wrong?

CV carbs will have a round with square flange top-4 screws, VM style carbs will have an elongated top-three screws, unless they are VM33s they will have 2 screws on the tops which are flat mostly. VM33s should fit where BS32s will, but the rubber flanges need to be installed correctly. VM26-VM28orVM29s the spigot is too small for the BS32 rubber flanges, and can be spaced differently. 2 outside match up, 2 inside sometimes dont. ;)

E
Click to expand...

What he said, check your boots

You can post one small pic when you reply - look down at the bottom of the reply for attachments before you post it

Big pics = web hosting site
 
Hi,

You can embed up to 10 pictures per post by using a picture hosting site like Photobucket or similar. There is a "how to" guide on my little website.

Yes, the intake boots on your bike come in two flavors, left hand and right hand. They should be labeled. Note that is "left" and "right" as you sit on the bike.


Thank you for your indulgence,

BassCliff
 
Ok well from the post I have CV carbs so this is a good thing

now I need to get these lines up. I have not changed the boots but the carbs were off the bike then i got it so I will take a look at them.

To further explain I can get the 2 right carbs or the 2 left carbs to line up just not all 4 at the same time. this is the same way on the air box so it appears that the center spacing of these are off some how.

If anyone could help me out with some thoughts that would be great

Thanks
 
The carbs do look to be a bit narrow for the 850 motor, so they could be off a 550 or 650 motor as they use the same carbs as the 850, so do look very similar. Check the main jet in one of the carbs after removing the float bowl. That will give you a good indication what motor these carbs are off. These carbs (BS32SS) were on the 550, 650, 750 & 850 motors, but they each had different jets in them.
 
so since they are the same carbs can i rejet them on the rebuild and but any parts to make them fit?
 
Are you sure your intake and exhaust boots are not installed upside down? Not the wrong boots for that bike?

Give us a measurement, I have an 850 sitting here, I can tell you your center carbs look too close together, from a 650 or something. . Mine are 30mm apart measured between the float bowl sides, the outer pairs are 15mm apart. The bracket for the throttle cable is different on yours too. I have a set of 850 carbs that were really bad, I have been parting them out. I should have all of the brackets and things so you can use them on your 850, maybe some of the jets you need too...
PM me if you want them.
 
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The space ib between the middle carbs is 1 and 3/4 inches which is not enough. How to I get these to fit?
 
Actually, the parts I have are only part of it. The center carbs spacing determines how the throttles go together, I don't think you can alter that distance without the #2 and #3 carburetor bodies, or at least the throttle mechanisms. Someone on this forum will have a good set for the 850, should be easy to find. Try Chef, he always has CV carbs. Actually I know someone who just bought an 850 set and can't use them on his 1100, let me check into it.....
 
mike63078 said:
Can anyone confirm this
Click to expand...

Confirm what? Why would tkent bull**** you? Have faith... :D



Yes, real GS850 carbs have a wider gap in the middle. And to be honest, it looks like the 1-2 and 3-4 gaps are wider than on your carbs, too. I don't know whether the carb bodies would be exactly the same or if you could just transplant the rails, fuel tubes, choke, throttle, etc. parts.

Here's a photo from the Carb Cleanup Series, which features a set of GS850 carbs. Note the wider gaps:
001_View%20Airbox%20side.jpg
 
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