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what is the correct size carb for a 78 gs1000 26mm 28mm ??

  • Thread starter Thread starter Anonymous
  • Start date Start date
carbs

carbs

i had a set of 28 mm flat side mkunis i had to heat the intakes and pry them in i have had this bike at top performance with a stock set of carbs and bigger main jets but it sat for many a years amd the carbs was missplaced. i now have a set off of a 78 750 with bigger jets trial error thing i guess i plan to play with it this week i will keep all of you guys posted..mike
 
Saaz
I posted this the other day.

Paul said:
I've got a Genuine Suzuki shop manual, the looseleaf type - not an aftermarket Haynes, Chilton etc.
I have just had a check and it says GS1000C/E/L & the S all have Mikuni VM26SS carbs.
The GS1000GT/GX/GLX had BS34SS
The later GS1000S had VM32SS carbs, but this was the Katana model with the 16 valve head.
Click to expand...

I know for certain that 'S' models all came here (UK) with the same size carbs as the standard GS1000, because the S was actually slower here in UK because it had the extra weight of fairing etc, different wheels (18"), but had exactly the same engine producing the same power! They cost more - so they didn't sell that well, but we had both blue/white & red/white versions. Of course Wes Cooley was unheard of here either, so the fact that it was a replica meant nothing!
 
Paul,
You're wrong mate.
I have a UK model 1000S with 28mm carbs.
Also my Genuine manual shows only the first year US models (the C), and all Canadian models as having the 26mm carbs.
All other non US models have VM28's.

I've also bought quite a few sets of carbs and had no trouble getting hold of 28's, although more 26mm carbs are now around because of the number of US imports around now in the UK.

Also the pic in my manual of the very last GS1000S with the 32mm carbs is definitely NOT a Katana, nor a 16 valve engine!

Hasn't Terry down under got one of these late bikes?
 
I thought I had not gone crazy! I have the 78 model with the 26mm, missed out on the 28mm. The 32mm bikes are around, but the 28mm S are more common.
 
brit7.11 said:
Paul,
You're wrong mate.
I have a UK model 1000S with 28mm carbs.
Also my Genuine manual shows only the first year US models (the C), and all Canadian models as having the 26mm carbs.
All other non US models have VM28's.

I've also bought quite a few sets of carbs and had no trouble getting hold of 28's, although more 26mm carbs are now around because of the number of US imports around now in the UK.

Also the pic in my manual of the very last GS1000S with the 32mm carbs is definitely NOT a Katana, nor a 16 valve engine!

Hasn't Terry down under got one of these late bikes?
Click to expand...
Martin,
I'm only stating what it says in the book. I've just pulled out a shop manual supplement for the 1980 1000S, which says that 1980 models had - wait for it - 34mm carbs! (BS34SS).
The famous (infamous?) GS1000, that was raced by Wes Cooley had 31mm Keihins. Did Pops Yoshi downsize the carbs?
I think that there maybe a lot of errors in some of these manuals/spec sheets.
Also when Suzuki changed the carbs from slide to CV there is a jump-up in size. And not all markets had the CV carbs at the same time!
 
Paul said:
Martin,
I'm only stating what it says in the book.
I've just pulled out a shop manual supplement for the 1980 1000S, which says that 1980 models had - wait for it - 34mm carbs! (BS34SS).
The famous (infamous?) GS1000, that was raced by Wes Cooley had 31mm Keihins. Did Pops Yoshi downsize the carbs?
I think that there maybe a lot of errors in some of these manuals/spec sheets.
Also when Suzuki changed the carbs from slide to CV there is a jump-up in size. And not all markets had the CV carbs at the same time!
Click to expand...


A 34mm CV has approximately the same max flow as a 28mm slide, due to the interference of the butterfly to the gas flow.
The Yoshi carb was a smoothbore slide with a relatively high flow, certainly much more than a BS34!
Err, yes, the 1980 1000S had BS34's, as did the 1980 GS1000ET and the 1980 GS1000GT. But I believe there was a model after that which had big slide carbs on, perhaps in the Aussie market only. Ask Terry. We in the UK didn't even get many (if any) of the CV carb ST model as there were a lot of unsold 79 bikes around, and the new GSX1100 was also on sale. My own bike is a 79 model, registered in May 1980.
I'm just quoting the (genuine) manual too. My experience also backs up that we didn't get many (if any) 26mm carbed bikes in the UK.
 
I remember an article about tuning carbs etc. I think it was in a dragracing book, anyway, there was a comparison table of various makes/sizes of performance carbs flow bench results, compiled by Byron Hines. His comment was that the 31mm CR flowed better (& more) than any carb he had ever seen.
 
They are. I confirmed with my manual and my mechanic. My carbs are stock and are 26's not 28's

Geez, I need to get bigger carbs :)
 
carbs

carbs

im looking into getting a new set of 29mm they are bored and smooth and will fit 26mm intakes i think i can get then for 365.00 new
 
Re: carbs

Re: carbs

michael kinder said:
im looking into getting a new set of 29mm they are bored and smooth and will fit 26mm intakes i think i can get then for 365.00 new
Click to expand...

Let me know what you finally find Michael if you would please. I want to put bigger carbs on mine as well but I can buy any condition as long as they are not damaged because my mechanic is just going to rebuild them then anyway. This will save me money. If anyone knows where I can find some low cost carbs for my 78 GS1000C that are at least 29's or larger please let me know.
 
im fed up with it lol..

im fed up with it lol..

im fed up with it i redone the carbs and got three going i found the trouble the #3 carb has a internal vacumm leak all other are working i rode it with a can of fluid in my hand..i bought a 1986 gs550es its more of a gruiser rocket style bike not quite as LOUD i hate to see it go but i need the money to bad rite now taxes and xmas i live in missouri the tax capital of the usa we get taxed for a porch on our house for real no joke.i think 2000.00 is a fair price?
 
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