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Anonymous
Guest
i have been tod once 26 then 28 then 29 ?? does anyone know for sure? im looking at buying me a set of new flat side mikunis for my bike it is a 1978 gs1000 posted some picture for all to look at. thanks again.
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Re: what is the correct size carb for a 78 gs1000 26mm 28mm
Re: what is the correct size carb for a 78 gs1000 26mm 28mm
Same carbs as the GS750 for 1977-79 Mikuni VM26. Stock jet size should be about 90-95.
Earl
Re: what is the correct size carb for a 78 gs1000 26mm 28mm
Same carbs as the GS750 for 1977-79 Mikuni VM26. Stock jet size should be about 90-95.
Earl
michael kinder said:
H
Hoomgar
Guest
I have a 78 GS1000C with the stock carbs on it yet.
They are 28's
They are 28's
I just talked with a friend the other night that recently bought the same bike and was told the carbs were 26mm. Apparently either my memory is faulty or his measurement was. You have the bike, so obviously its my mistake. 
Sorry about that.
Earl
Sorry about that.Earl
Hoomgar said:
H
Hoomgar
Guest
Anything is possible Earl. I am going by someone telling my they are the stock carbs. But as I have found out some of the other things on my bike are not stock. There is a possibility that my carbs my not be stock even though I was tols they are. I have the microfiche, doh! Let me look it up
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Hoomgar
Guest
Well that proved fruitless. You can always call the dealer.
The microfiche is good for part numbers. But doesn't say what the carbs are. I can tell you that the pictures in it are not the carbs that are on my bike.
Mine may not be stock after all. Disregard my earlier comment.
The microfiche is good for part numbers. But doesn't say what the carbs are. I can tell you that the pictures in it are not the carbs that are on my bike.
Mine may not be stock after all. Disregard my earlier comment.
The part I remember most clearly was in noting that the carbs on my friends 1000 were the same size as the carbs on my 79 750 which are 26mm VM.
The really odd thing I noted was that my 750 uses 102.5 main jets and my friends 1000 was set up with 95 mains.
I'll email and find out if my memory is faulty. and post the answer I get.
Earl
The really odd thing I noted was that my 750 uses 102.5 main jets and my friends 1000 was set up with 95 mains.
I'll email and find out if my memory is faulty.
and post the answer I get. Earl
Hoomgar said:
S
SqDancerLynn1
Guest
My GS 1000E book lists the carbs as VM26SS
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DJones
Guest
carbs
carbs
The Suzuki Performance Portfolio list the `78 GS1000 /26mm carbs
the `79 Wes Cooley GS1000S/ 28mm carbs. The 29mm carbs were an after market performance upgrade usually paired with a 4into 1 pipe.
carbs
The Suzuki Performance Portfolio list the `78 GS1000 /26mm carbs
the `79 Wes Cooley GS1000S/ 28mm carbs. The 29mm carbs were an after market performance upgrade usually paired with a 4into 1 pipe.
P
Paul
Guest
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.
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.
A
Anonymous
Guest
carbs
carbs
ok thanks it looks like mine are 26mm they are stock off of a 1978 gs750 the darn intakes are what hold you back with going to a bigger carb because they bolt on rather then slip on. i bought a rebuild it kit stock jets are .95 so now with the mods my bike has im going to have to rejet up to about a 145 thanks for the help again,,mike
carbs
ok thanks it looks like mine are 26mm they are stock off of a 1978 gs750 the darn intakes are what hold you back with going to a bigger carb because they bolt on rather then slip on. i bought a rebuild it kit stock jets are .95 so now with the mods my bike has im going to have to rejet up to about a 145 thanks for the help again,,mike
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Don Lobacz
Guest
26mm are stock for the GS750 and 1000, with 28mm on the 1000S. There are quite a few Kaw 28mm carbs that end up on GSs, too (there is no center vacuum outlet on these carbs). One more wrinkle: there was a company called Maxibore that took your 26mm carbs and bored them out to 29mm along with "enlarging critical orifices and passages". I have seen a few of these carb sets: the motor-side throat looks paper thin and 1 set even had a hole in the body where the vertical bore (slide) meets the horizontal bore.
True 29mm smoothbores have quick-change bowls, an upper throat barrier (for a "smooth" bore), and 4 airhorn inlets across the bottom back (air filter side) of the carbs.
What modifications have been made to your bike? 145 Mikuni mains will almost definitely be too big and cause the plugs to foul. 115-120 would probably be the biggest you want to go. K&N jet numbers are different and made to work with K&N needles, but a 138 K&N main would probably be close to a 115 Mikuni main. Jetting your bike will almost definitely involve adjusting your needle height.
True 29mm smoothbores have quick-change bowls, an upper throat barrier (for a "smooth" bore), and 4 airhorn inlets across the bottom back (air filter side) of the carbs.
What modifications have been made to your bike? 145 Mikuni mains will almost definitely be too big and cause the plugs to foul. 115-120 would probably be the biggest you want to go. K&N jet numbers are different and made to work with K&N needles, but a 138 K&N main would probably be close to a 115 Mikuni main. Jetting your bike will almost definitely involve adjusting your needle height.
A
Anonymous
Guest
28mm
28mm
the motor is punched out to a 1305 big bore kit head is polished and ported star header v h clutch cams cut trans welded crank k n filters ss valves heady springs.this was a full blown drag racer in its time did you see the pictures on the collum?
28mm
the motor is punched out to a 1305 big bore kit head is polished and ported star header v h clutch cams cut trans welded crank k n filters ss valves heady springs.this was a full blown drag racer in its time did you see the pictures on the collum?
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Paul
Guest
Mike,
If you are running this set-up you will want bigger & better carbs than standard - "the motor is punched out to a 1305 big bore kit head is polished and ported star header v h clutch cams cut trans welded crank k n filters ss valves heady springs"
On my GS1238 dragbike I ran 34mm mikunis, these were off a 750TZ Yam, then bored out to 36 (I think the exact size is 35.7!). The slides were drilled to enable a "tickover" or rather a bottom rev limit of 2000rpm, so it wouldn't stall before you got to the line.
By the way, 1238 is about as big as you can go with a 2-valve engine.
This was in the mid-eighties when 36mm RS flat-slides weren't about!
Mine was a "full blown drag racer" - 8.9s @ 173mph over the quarter, 5.2s @ 132mph on the eighth. 5.5" rear tyre. It was the fastest 2-valve Suzuki in Europe (or if you like - the fastest outside the states!) A lot of the reason I ran what I did was cost & availability of parts (which comes back to cost again!)
If you are running this set-up you will want bigger & better carbs than standard - "the motor is punched out to a 1305 big bore kit head is polished and ported star header v h clutch cams cut trans welded crank k n filters ss valves heady springs"
On my GS1238 dragbike I ran 34mm mikunis, these were off a 750TZ Yam, then bored out to 36 (I think the exact size is 35.7!). The slides were drilled to enable a "tickover" or rather a bottom rev limit of 2000rpm, so it wouldn't stall before you got to the line.
By the way, 1238 is about as big as you can go with a 2-valve engine.
This was in the mid-eighties when 36mm RS flat-slides weren't about!
Mine was a "full blown drag racer" - 8.9s @ 173mph over the quarter, 5.2s @ 132mph on the eighth. 5.5" rear tyre. It was the fastest 2-valve Suzuki in Europe (or if you like - the fastest outside the states!) A lot of the reason I ran what I did was cost & availability of parts (which comes back to cost again!)
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Anonymous
Guest
gs
gs
the papers i got with the bike has a 1305 big bore kit on them the bike had a set of flat side mikunis on it but i put the on my 79 kz90 drag bike then sold it i thought i would never get the gs out again i had over 800.00 in the carbs i let go on the kz. the best time for this bike is a record time at a local strip 161 mph in the 1/8 mile with a heavy rider im 100 lbs less than him im planning on running this bike in sikeston missouri its onlt 35 miles from my house this guy knew how to set a bike up with the right sprockets tires and trans work it had a msd air shifter and nos set uo but i took it all off and sold it on ebay last month. i will have to give it a few test runs on the back rurual roads behind my house.
gs
the papers i got with the bike has a 1305 big bore kit on them the bike had a set of flat side mikunis on it but i put the on my 79 kz90 drag bike then sold it i thought i would never get the gs out again i had over 800.00 in the carbs i let go on the kz. the best time for this bike is a record time at a local strip 161 mph in the 1/8 mile with a heavy rider im 100 lbs less than him im planning on running this bike in sikeston missouri its onlt 35 miles from my house this guy knew how to set a bike up with the right sprockets tires and trans work it had a msd air shifter and nos set uo but i took it all off and sold it on ebay last month. i will have to give it a few test runs on the back rurual roads behind my house.
frosty5011
Forum Mentor
On my GS1000 '78, they are 26mm VM carbs. Attached is a copy of the Suzuki Service manual with the appropriate info:
I am also wondering why the GS1000 carbs have #95 jets, and the GS750 has #102.5 - these being stock sizes.
I am also wondering why the GS1000 carbs have #95 jets, and the GS750 has #102.5 - these being stock sizes.
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Anonymous
Guest
carbs
carbs
there is a local custom shop mclever cycle he put a 4/1 header and k n filters on a 1981 gs750 and had to go to a 140 main jet to make it run smooth and have power..
carbs
there is a local custom shop mclever cycle he put a 4/1 header and k n filters on a 1981 gs750 and had to go to a 140 main jet to make it run smooth and have power..
I agree with a previous post. With the mod's on your motor, the stock VM26 carbs are holding the other parts back.
I have a '79 1000E with 1085 pistons, K&N ovals and V&H 4-1 pipe. I run the stock carbs with a Dynojet kit, 138 main. Needle clip in #4 from the top. I'd love to get some 29mm smoothbores, but I'm happy enough with the bikes performance. But with your mod's, get some better carbs.
I have a '79 1000E with 1085 pistons, K&N ovals and V&H 4-1 pipe. I run the stock carbs with a Dynojet kit, 138 main. Needle clip in #4 from the top. I'd love to get some 29mm smoothbores, but I'm happy enough with the bikes performance. But with your mod's, get some better carbs.
S
saaz
Guest
I will just add tothe info or confusion...
As far as I know, 26mm carbs were std on 78 models (well, mine had them, the manual only lists them). The S model later on came with the 28mm carbs (as per Lynn), as did (from 79 I think) the standard models. These are not that common over here.
Confusion arises because of what went to different markets. It seems US standard models in 1980 still had 26mm (going by the PDF of the manual I have), but the S and G models had the 34mm cv carbs. At that time the European and Australian markets had the 28mm for chain models and CVs for G models. We also had production racing with the S model, so would have gotten the best available.
I also clearly remember we also got a 30mm slide carb S model instead of, or perhaps in addition to, the 34mm CV model in the US. I had a test of one, but lost it to water damage years ago....These models are rare beasts.....only came in white/red colours I think
I have some older Kawa 9 28mm carbs on my bike, really want some 30mm jobbies...would settle for some 29mm smoothbores, but for road use it goes fast enough as is if I tune it properly...
Has anyone got a Euro or other market spec manual?
As far as I know, 26mm carbs were std on 78 models (well, mine had them, the manual only lists them). The S model later on came with the 28mm carbs (as per Lynn), as did (from 79 I think) the standard models. These are not that common over here.
Confusion arises because of what went to different markets. It seems US standard models in 1980 still had 26mm (going by the PDF of the manual I have), but the S and G models had the 34mm cv carbs. At that time the European and Australian markets had the 28mm for chain models and CVs for G models. We also had production racing with the S model, so would have gotten the best available.
I also clearly remember we also got a 30mm slide carb S model instead of, or perhaps in addition to, the 34mm CV model in the US. I had a test of one, but lost it to water damage years ago....These models are rare beasts.....only came in white/red colours I think
I have some older Kawa 9 28mm carbs on my bike, really want some 30mm jobbies...would settle for some 29mm smoothbores, but for road use it goes fast enough as is if I tune it properly...
Has anyone got a Euro or other market spec manual?
D
Don Lobacz
Guest
Wow, Michael, that is a honkin' big motor you have there. You need to pass a lot of air for a motor like that, and even 29mm won't do it justice.
An 81 GS750 has 32mm CV carbs, so 140 mains would probably work for that.
Some of the best carbs to tune are the 34(?)mm CV carbs found on 81-84 KZ1000s and 1100s. These carbs vent their diaphrams to the atmosphere, not the airbox, and thus removing the airbox doesn't produce the huge stutter effect.
If you previously had big carbs in your motor, then you probably have big carb boots and the 26mm carbs will fall right out of them.
An 81 GS750 has 32mm CV carbs, so 140 mains would probably work for that.
Some of the best carbs to tune are the 34(?)mm CV carbs found on 81-84 KZ1000s and 1100s. These carbs vent their diaphrams to the atmosphere, not the airbox, and thus removing the airbox doesn't produce the huge stutter effect.
If you previously had big carbs in your motor, then you probably have big carb boots and the 26mm carbs will fall right out of them.