What are these off of?!

[makenzie71]

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?

[tom203]

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?

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.

[makenzie71]

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:

[TheCafeKid]

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.

[makenzie71]

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.

[tom203]

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.

I got a set off a 82 650, the throttle plates have 135 stamped on them.

[makenzie71]

That's really just an internal part number for Mikuni.

[makenzie71]

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.

[TheCafeKid]

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?

[makenzie71]

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?

[tom203]

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.