What are they off?

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G'day all,
First hope you've all had a great Christmas Day, and that it hasn't been too cold up there in the northern hemisphere.
Now then, got myself a set of VM Mikuni carbies. Just curious as to what motorcycle they may have originally been from?
They are 33mm inner diameter where they meet the rubber engine manifolds. There is an number stamped on them, 49120, which doesn't correspond to anything I can find in my Suzuki factory manual.
I was wondering if they're actually VM32's (the extra 1mm in diameter seems to be a Mikuni thing... a set of VM28's I've got are actually 29mm in size).
Some other specs: the pilot jets are #20, the needles are 5DL36, and the slides have 1.5 stamped on the underside. (Main jets are #140 but these were put in by the previous bloke who tells me he used them to power his sidecar dirt-tracking outfit. )
Any clues as to origin that you guys can give, would be appreciated.
Cheers,
Mike.

[sharpy]

As they say. a picture is worth a 1000 words OR you could put 5DL36 into google and come up with something like this....... http://www.motosport.com/motorcycle/...RETOR-(GS1000C Maybe thats what u have

[Agemax]

we need some pics to ID them properly

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Ah, right you are chaps. Here we go...

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And some more...

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Side on...

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The other side...

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And from the underside...

[Agemax]

33mm smoothbores, the 28's are actually 28mm, if you feel in about an inch from the edge of the carb (on the head side) you will feel a lip which brings the venturi bore to exactly 28mm

[Guest]

'78 or earlier. I thought the larger bore VM round slides larger than the 28's had a bolt type drain plug on the bottom of the bowls and I don't recognize the square casting on your first side view, but Mikuni made carburetors for a lot of different motorcycles.

[Agemax]

not all smoothbores had the big drain plug, earlier ones didn't. the square casting on the right side of the carbs denotes smoothbores

[chuck hahn]

I agree Vet. ever 29 ive ever seen had the big nut..and so do the 33s far as I recall. Look like either 28s or 26s to me.

[chuck hahn]

Got a schematic for those earlier ones Agemax??? Sudcos schematic shows only one kind...with the nut.

[Agemax]

look at the air orificies on the inlet side of the carb, totally different to 26 or 28's.
post a pic from the top, the throttle linkage levers, they are totally different to stock VM 26/28's as well.
they are smoothbores

[Guest]

28's are different on the intake side (air filter) and have more brass on the small visible passages around the bore. I have no expertise with identifying these carburetors. I can just comment on what I have seen personally on the few I have seen, and that is not a lot of them.