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What are these off of?!

  • Thread starter Thread starter makenzie71
  • Start date Start date
M

makenzie71

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I have a set of Mikuni BS32SS carburetors that I nabbed off an old CB750/Four.

The spacing is 75 x 81 x 75 (giver take a mm)

I think they're Kawasaki or Suzuki in origin, but I want to pinpoint what exactly they're from. The only thing written on them is the 140 stamped on the butterfly...really helpful.

Any ideas?
 
makenzie71 said:
I have a set of Mikuni BS32SS carburetors that I nabbed off an old CB750/Four.

The spacing is 75 x 81 x 75 (giver take a mm)

I think they're Kawasaki or Suzuki in origin, but I want to pinpoint what exactly they're from. The only thing written on them is the 140 stamped on the butterfly...really helpful.

Any ideas?
Click to expand...
Post a pic and someone will help. All the hondas that I've seen had Keihins. Spacing would be different if it was converted to a honda 4.
 
I know they weren't stock on the Honda...or else I'd know what they were for.

They're BS32S's.

look just like these...only a few mm different in spacing:

mikunibs32ss01.JPG


mikunibs32ss02.JPG
 
Can you still see a serial number on the bodies anywhere? Someone aroundhere (maybe Steve?) had a list of serial numbers and which bikes they came on. For instance we deduced Roses old 550L's carbs originally didn't come on that bike, as they're stamped for a 650.. According to his list.
 
I can't find a serial number...no numbers at all except the 140 on the butterflies. Where are these numbers at usually? I've got a bucket of carburetors that I can't sell becuase I don't know what they're from...if they've got serial numbers on them I'd be extremely excited.
 
makenzie71 said:
I can't find a serial number...no numbers at all except the 140 on the butterflies. Where are these numbers at usually? I've got a bucket of carburetors that I can't sell becuase I don't know what they're from...if they've got serial numbers on them I'd be extremely excited.
Click to expand...
I got a set off a 82 650, the throttle plates have 135 stamped on them.
 
It might mean something different I guess...my BS32SS throttles from my 1981 GS750E have 135 stamped on the butterflies, too.

The mystery set have 140.
 
Usually they're "inked" into the top of the body around the head where the diaphragm sits. On the outside though. I've got a few sets some you can still see, some ya can't.
I think the number on the butterfly plate is the part or "jet" number for the plate itself.
I'm gonna guess they're off a 850. That's the biggest bike that had 32s on it. I've got a box full of carbs to try to identify and see what's good and what isn't.

Yanno, that reminds me... I have a set off a XS yammaha that I swear had 140 butterflies. You said they aren't spaced for a GS... Wonder if they're off a yammie?
 
Yeah there's no inking on them. I don't know how ink could ever hope to stay on them.

I thought that the GS850 used the same spacing as the GS750's? My BS32SS carbs from my 1981 GS750 have a wider stance than these mystery carbs. They're spaced nearly the same as a 1976 CB750/Four....I think that would actually put them in the Kawasaki category but I don't really know for sure. Did any later model GS's have the BS32SS's on a narrower rack? What about the 650's? Are they the same as the 750's or narrower?
 
My spare 650 carbs (either L or G) have about 3" spacing between carbs 1 and 2 and 3 and 4. Between 2 and 3, centerline spacing is about 3.2.
 
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