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GS550 carbs on a 750?

  • Thread starter Thread starter txironhead
  • Start date Start date
T

txironhead

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What MM are GS550 carbs? I'm trying to find a set of 32MM CV's for my '81 GS750 and found a set for a 550. I'm going to have to rejet anyway, so that's not a problem, but will they work?
 
My money is no. I"m fairly sure the GS750 has a different carb spacing from the 550, 650, and 850's. If it's not.... Party on. :-) Who's got the carb spacing handy for a 750-1100?
 
If you still have the old carbs, and the spacing is in fact different (and assuming the throat size matches), couldn't you use the rails and choke linkage from the old carb rack so the new carbs would be spaced correctly?
 
I'll measure my spare 550/650 parts set when i get home.. and post up
 
Thanks! I know the throat size AND the spacing are both off with carbs from an 1100, since that's what I was originally going to use. The 750 uses 32mm, the 1100 uses 34mm, I was wondering if the 550 used 32mm.....will await answers. Can't measure them side by side right now.
 
What year are the 550 carbs from? The later TSCC models are equipped with two two-barrel carbs.
 
The 80-82 GS 550 uses BS32SS carbs according to the Clymer manual.
 
Where does it say the model number on the carbs? I've been trying to find it on the 750 and 1100 carbs with no success.
 
Okay, found the post, now I'm seeing double. I found this:

83 GS550E
Mikuni BSW30SS 30 mm

and this:

GS550 (80-82)
carb mik bs32ss (4 seprate carbs)

Did they put smaller carbs on the newer bikes? I still don't know if the 80-82 GS550 carbs will fit my GS750E.

There were no specs for the 750, either.
 
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Ignore the 83-86 GS550's. They're actually GSX550's :-) And yes, the carbs got smaller. the carbs on the GS550 from 80-82 are way to big for the motor.

The 32mm carbs will support 70-80hp.

I think the point is though.. the carbs should'nt fit.
 
Het,
What condition are the 34mm 1100 carbs you have in?
I can take the 750 32's off my 1100 and trade up with you providing all is good with yours. Are all your pilot screws free and can be removed?
Are the Bodys all good? Diaphrams Good?
Are they Fuel tight(no leaks between carbs at fuel tubes etc.)?
Mine are all good. The jets will need replacing prob cause if I remember rihgt when I removed the original jets they were in poor cond.
Let me know and I can take them off and switch out the jets and all I changed to get them to work on mine.

Paul
 
After going to the Dynojet website and doing some research, it turns out the PO probably DIDN'T install a Stage 3 kit like he said. The reason I say this is the Stage 3 kit (#3315.003 for 80-85 GS750E) comes with "Main Air Correctors" which are supposed to be tapped and glued in over the existing main air jets. The carbs that came with the bike had nothing over the main air jets. I will have to disassemble the 1100 carbs (that I put the jets from the 750 into) and find out what size jets and needles came with the 750. The bike was running at one time with the V&H exhaust and pod filters and the PO claimed he had done a jet kit on it. Is there a jet kit that doesn't run "correctors"? Here's the DynoJet specs:

Main Jet DJ130 (for aftermarket exhaust)
Main Air Correctors DC0302
Fuel Needles DNT604
plus drill bits, screw, e-clips, etc.

I know I wrote down the jet sizes before I swapped 'em out, I just have to find it. Do the fuel needles have sizes and/or part #'s on them? I just don't have the money for a new DynoJet kit right now.

Paul: The 1100 carbs are in GREAT condition, everything free and removable, diaphragms are in great shape. However, I did not know the needle jet could be pressed out and cleaned so you might have to check that. (thanks for the rebuild link guys!) I cleaned everything else thoroughly. As far as fuel leaks, I doubt it but cannot say for sure because I have never put them on the bike (still waiting on the bolt kit to button up the engine.) All of the o-rings looked great when I cleaned them. Do you have a stage 3 kit for the 750 carbs?
 
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No I don't have stage three for the 750 carbs. I was able to get it running good swapping out different jets( mains, pilots, air), needles and needle jets from 34's, shims and float adj. If you know or can find out what size jets (main,air, pilot air) you will need I will put them in. As well as put the 32mm needle jets and needles back in stock arrangement. They do have new fuel screws, and new float needle and seats. You will have to re-adjust the floats for your bike. I never seperated the bank of carbs, and they haven't leaked at all in 800 miles with them on the bike.
Paul
 
Paul,

From what I've gathered from my various posts, these are the size jets, etc. that I'll need.

Pilot Jet: 45
Main Jet 122.5
Pilot Main Air Jet: 180
Adjustable needles.

I'll find a #30 drill bit for the slides locally.

I put all of the original jets and needles back in the 1100 carbs and checked to make sure everything was still free and moveable (it was). I have two different choke cable mounting systems: a clamp type and a screw-in type. Which one do you want for the 1100 carbs? I can't remember if I swapped that part out.
 
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