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No O-rings for Carb-to-Head boots?

  • Thread starter Thread starter EdgeGrip
  • Start date Start date
E

EdgeGrip

Guest
1977 GS750 (11578) Manuf'd in Aug of 76

So Im finding out there are subtle differences in a lot of the 77-79 750's recently. So thats why Im asking this question. I pulled off the boots on the cylinder head that the carbs attach to to replace the o-rings. But there dont seem to be any o-rings. Is this legit or am I missing something?

IMG00733-20120225-1953.jpg


IMG00736-20120225-1953.jpg


IMG00737-20120225-1953.jpg


I didnt dig too hard into the boot to try to "find" an o-ring, but unless that sucker has become one with the boot, I can't see an o-ring. But on the fiche on the boulevard website, it shows only one PN for the boot and o-rings that go with them....

Thanks in advance.
 
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You've got it right, it's totally flattened

Take a pick or knife and dig it out
 
Yup, as Big T says, it's there - just completely flattened & hard as a rock...
 
Thanks guys! I didnt want to start digging too hard into it.

Real quick, can you tell me what model 750 I have with the frame number listed above?
 
I believe the very early 750's didn't have O-rings. By all means, pick around at those boots but don't dig too hard. On second thought, dig away and then throw them away and get new! They are sure to be hard as a rock.
 
Only pic I have of it in one piece after I brought it home:

IMG00669-20120213-2004.jpg


So I guess Ill be digging into the boots and ordering new ones....freakin another C-note out the door....
 
Nessism said:
I believe the very early 750's didn't have O-rings. By all means, pick around at those boots but don't dig too hard. On second thought, dig away and then throw them away and get new! They are sure to be hard as a rock.
Click to expand...

Hey Ed,

I think the ones without the o-rings have the inlet ports cast into the heads, and attach to the carbs with "boots" that attach with clamps on both the head & carb side...

If you have the inlet boots with the flange that bolts to the head, then I'm pretty sure you have the o-ring - seems like you can see that flattened little sucker in the pics.
 
EdgeGrip said:
Only pic I have of it in one piece after I brought it home:

IMG00669-20120213-2004.jpg
Click to expand...


Nice looking bike... I believe that's an "L" model (crusier), 8 valve engine with VM carbs, points ignition, sporting aftermarket mufflers.


What's that puppy behind her??
 
Well it has a Dyna S ignition under the right cover. But the coils (?) under the gas tank have the plug wires running directly out of them....it seems that if you had to replace a wire, you would have to replace the whole assembly. Does that sound correct?

I'm ditching all the cruiser stuff, got some stock pipes for it, gonna get a new seat, etc.

Bike in the back is a K6 GSXR 600. My race bike. second pic was at a track day but I got my race license not long after.

P1000566.jpg


ORB_4709.jpg
 
I looked at the parts fiche on alpha and on boulevard. I realize they are in the pics. I went out today and tried to dig them out.....there were no o-rings. I ended up just destroying the boots. It was just a solid piece of rubber with a "lip". I already ordered the o-rings from cycleorings in preparation for this job but I must have a unicorn of a bike cuz it didn't have o-rings. So boots are next on the list.
 
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Not an L. Thats a B. but the seat isnt stock/correct. Nor are the pipes.
 
I looked up L's also. Seems they had a metal rear fender, smaller gas tank, and cast wheels. Someone just "cruised" this thing....that's all about to change. Btw, how can you tell it's a B? Is there a resource for that info? I searched here but didn't come up with much. I googled it but I also couldn't find a whole lot about the differences in models.
 
Those are the inlet rubbers from the first bikes made back in 76 and they don't have O rings as Ed says. Either seal with a paper gasket 'soaked' in blue Hylomar or toss and replace with the rubbers from a 77 onwards bike. Chances are that rubber is rock hard by now anyway so I would toss 'em.
 
This thing must be a low SN bike. What I did find on google was some info about the press release of the bike in July of 76 and the build date is August on this thing so it must have been in the first batch....

I destroyed one of the rubbers so new ones are now in the lineup of parts needed.
 
I concur, my '77 gs400 does not have orings, just a lip built into the boots and nothing on the spacer. For my model, it is the boots from '78 and later that have separate orings. When i had mine off, the "ring" were pretty flat but the rest the rubber still seemed good, so I used some of the carb boots gaskets (go inbetween the head and the spacers)- placed between the boot and the spacers. Seems to work well so far.
 
The other thought I have had is that Amal 11/2s have an O ring but no recessed groove for it - you just 'stick' the O ring on with grease when you plumb the carbs back on. I guess that would work as well on here.
 
EdgeGrip said:
Well it has a Dyna S ignition under the right cover. But the coils (?) under the gas tank have the plug wires running directly out of them....it seems that if you had to replace a wire, you would have to replace the whole assembly. Does that sound correct?

I'm ditching all the cruiser stuff, got some stock pipes for it, gonna get a new seat, etc.
Click to expand...

Both my 750's came with the glued in spark plug wires too. Haven't had need to replace them, but will switch to a plug in style coil if I do.

I'm interested in the old pipes if you just want to get rid of them.
 
Apologies for helping you ruin a boot. Some folks have had success cutting the epoxy around the plug wires at the coils, pulling the existing wires out, and installing new wires, and gluing them in with silicone. I have not personally tried it.
 
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