What are they off?

[chuck hahn]

Now Im gonna have to get the 28s I got from Jeff Saunders down and lay them along side Gregs 29s and compare...LOL. never paid that close attention to the arrangements myself..but nice to see and learn that stuff.

[steve murdoch]

Some more info from the Z1Enterprises site.
It does mention the early smoothbores having drain plugs.
It also shows that early Z-1 stock 28mm carbs had the 17mm nut on the bowl.

http://www.z1enterprises.com/Z1CarbGuide.aspx

[sharpy]

Yes kawas have the nut on the bottom but only way to see if there smooth bores are a look down the guts. Suprize suprize, they have smooth bores......

[tfb]

G'day all,
Thanks for your musings there, gents; very interesting to get your views on identifying the carbs.
Chuck, they are definitely not 26 or 28mm carbs... as they measure 33mm exactly for the ID on the engine side. And they are *much* bigger carbies than the VM28's currently on my GS1000.
As the intake side of the carbies seems to be drawing a bit of interest, here's another couple of photos.
First is the rear of carbie #1...

[tfb]

A bit more info:
The OD of the intake (where the air filters fit) is 48mm.
The carbs don't have the big bolt-style drain plugs on the bottom.

And now the rear of carbies #3 and #4...

[sharpy]

Its simple. Open the slides wide open and see if there smooth bores and dont have the curved area for the slides. that will end the smoothbore debate

[Agemax]

they are, without a doubt smoothbores. the small square on the r/h side of the casting gives that away. the bores look very oval, and the walls on the head side look quite thin.
are they a set of 29's bored out to 33's?
they could be a set "played" with by Wiredgeorge. he bores out 26/28's out to 29mm using oval bores. i am currently having a set of 28's bored to 29mm

[GregT]

Its simple. Open the slides wide open and see if there smooth bores and dont have the curved area for the slides. that will end the smoothbore debate

Correct as usual mate...

i've just been through this with a local with a GS1000ST - like these they measured up at 33 on the engine side but were oval bores.
Suzuki used these nominal 30's on the ST's and some of the rarer 1100's.

JohnKat should be able to identify, he's got a couple of sets of them.

[sharpy]

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

So ure saying all smoothies have the square casting, or just the 29's?

[tfb]

G'day blokes,

As usual lots of great info. coming up here... have learned more about identifying Mikuni carbs in the last 2 days than in than in the last 10 years. Which may say more about my original level of knowledge than anything.
Agemax, I don't think they've been bored out at all; no 'boring' evidence to be seen.

It seems that Mikuni did make 33mm smoothbores; if you go to the Z1 site you can see the stuff that they stock for the "33mm smoothbores".

Well folks, that's been a great help. Nice to be reminded of the Z1 site for parts for these carbs, too... gunna need a few bits and pieces.

Now then, another question. The slender brass 'siphon' that feeds the choke circuit from the bowl on #1 carb has been busted off in the past. Is that something that you guys have ever managed to fix? Or as it's just the one choke circuit on one carb that's affected, would you bother?

Bat on,
Mike.

[GregT]

Yes, the local GS1000ST carbs - VM30's with 33 bore on the engine side.....had a broken choke circuit standpipe too. I used a small easyout to remove it - they're only pressed in.
I had a broken set of 29 smoothbores here and the standpipes were similar so I extracted one and gently tapped it into place in the VM30 body...

Oh, and while I think of it, the ST owner put me onto your website when we were talking cam timing. Very useful, thanks.

[sharpy]

Hang on, what carbs are they as they are NOT 33 smoothbores. we need a pic of the troat with slides open to see if they are or arent smootbores, thanks

[Agemax]

So ure saying all smoothies have the square casting, or just the 29's?

i am not certain about all the sizes, but 29's DEFINATLY have the square casting, as shown in the pics. they also used both style of float bowls at various times, obviously the easiest way to see is to look through the venturi, they also have shorter slides with the cutouts on the sides and the slide linkage lever at the top are different to normal VM's as well.

TFB, sent a couple of pics to Wiredgeorge, he will identify them correctly for you

[sharpy]

i am not certain about all the sizes, but 29's DEFINATLY have the square casting, as shown in the pics. they also used both style of float bowls at various times, obviously the easiest way to see is to look through the venturi, they also have shorter slides with the cutouts on the sides and the slide linkage lever at the top are different to normal VM's as well.

TFB, sent a couple of pics to Wiredgeorge, he will identify them correctly for you

OK well i have both 29 and 33 smooties and only the 29 has that casting. All i want is a look thru the guts, thats sure fire way to see if they are smoothies

[tfb]

Here you go gents. And yes, I do realise that needle will have to be replaced. Cheers, Mike.