Carb OEM specs as per factory manuals

First post! Great resource here. I looked all over the web for a repair manual for my 83 Suzuki GS750ES. I eventually coughed up the dough for a PDF. Here's what the manual says for my bike:

Carburetor Information For a 1983 Suzuki GS750ES

Carburetor Type: MIKUNI BS32SS
Bore size: 32 mm (1.3 inch)
I.D. No. 06A00 (06A10 for CA)
Idle r/min. 1,150 ± 100 r/min
Fuel level 5.0 ± 0.5mm (0.20 ± 0.02 in)
Float height 22.4 ± 1.0 mm (0.88 ± 0.04 in)
Main jet (M.J.) #122.5
Main air jet (M.A.J.) 1.7 mm
Jet needle (J.N.) 5C-28
Needle jet (N.J.) Y-5
Pilot jet (P.J.) #37.5
By-ass (B.P.) 0.8, 0.8, 0.8 mm
Pilot outlet (P.O.) 0.7 mm
Valve seat 2.0 mm
Starter jet (G.S.) #45
Pilot screw (P.S.) PRE-SET
Pilot air jet (P.A.J.) PRE-SET
Throttle valve (Th.V.) #135
Throttle cable play 0.5 - 1.0 mm (0.02 - 0.04 in)
Choke cable play 0.5 - 1.0 mm (0.02 - 0.04 in)

BUMP

Still no info for a GS700 as far as air screw? Preset is worthless..

Hi,

What you call an 'air screw' is actually an idle mixture screw. If you start with them set about 2.5 turns out from lightly seated, then use the "highest idle" method to fine tune them, you'll be good to go.



They may not be set all the same due to differences between each individual carb.


Thank you for your indulgence,

BassCliff

BUMP

Still no info for a GS700 as far as air screw? Preset is worthless..

It'll take a few days due to spotty internet connectivity, but I'd welcome "doing" the carb specs for the 82-83 GS1100 2-valve series of models. I have a Factory Service Manual and hardcopy of the microfische. I also have a FSM (no fische, but that's all on the internet anyhow) for early (points/condenser, kick-start) GS850 series, too. I read some of the the thread, but got lost in all the web-lingo. What format, sent to whom?

You can post the info in a thread or send me a PM and I will add it.
I need the model, and year of the bike, all the carburetor info as given in the factory manual as well as the jet sizes. See post #136

Thanks

GS1100G series carb specs

It'll take a few days due to spotty internet connectivity, but I'd welcome "doing" the carb specs for the 82-83 GS1100 2-valve series of models. I have a Factory Service Manual and hardcopy of the microfische. I also have a FSM (no fische, but that's all on the internet anyhow) for early (points/condenser, kick-start) GS850 series, too. I read some of the the thread, but got lost in all the web-lingo. What format, sent to whom?

[GS750]

I found this in my service manual.
It is for GS750 1976-1979 ,GS550 1977 - 1982



Check the Engine no. ,not frame no. Look for the differences on the same model!!!

I hope it will help

Im finding all this sooo strange because the Suzuki service manual that originally came with my GS750B 1977 say, and the actual settings on the bike were:

VM26SS
Main Jet: 105
Air Jet: 1.1
Needle Jet: P-1
Jet Needle: 5F21-3
Pilot Jet:22.5
Pilot air jet: 1.6
Cutaway: 2.5
air screw: 1-1/4 turns back


but with that information and my engine number (which my dealer verified is original to my bike frame) it would be

VM26SS
Main Jet: 100
Air Jet: .7
Needle Jet: O-6
Jet Needle: 5F21-3
Pilot Jet:15
Pilot air jet: 1.6
Cutaway: 1.6
air screw: 1 turn back

My Clymer manual doesnt give any details at all, I guess they decided not to because of so many variables.....

So what should I believe???

well just think i found the problem with the gs im working on, 3.5 turns back for a mixture screw is really far tho (i was going by the gs550 vm carbs but the bike i have is a 550e with cvs!) duh!

The airbox and filter must be on, must not be leaking air (sealed properly) and any rubber snorkels or whatever must also be present. If you have pods then you will not be able to use standard jettings. The carburettors must be cleaned, preferably dipped overnight and all rubber o-rings replaced as well as any intake o-rings if used.

It goes without saying, that the valve clearances, spark, and compression must also be in order.
If the above is not in order you will be chasing your own tail, when trying to adjust the idle mixture

Marvelous work, sir. Being a new member, I searched the FAQs and found that posting. Sadly for moi & my 1982 GS1100GK2/USA (BS carbs), the idle adjustment screw setting says "preset". That's all I've ever seen, been told or discovered. All the other specs are spot on for my ride.

Anyone out there happen to know what that "preset" number of turns was-is? It pops, spits and snarls at all 1/4-turns up to 2-1/2 turns out.

This scooter was a provebial barn find, after someone decided to see what was inside the 4 carbs, and engine. Now I've the devil of a time getting those 4 things sync-d. And, yes, I have a factory-original manometer and the factory manual.

BTW, have never had this sync-ing prob with my '79 GS850G VMs, or with my shop's parts-bin-discovery of some smooth-bores now on that engine... or any other of the Big Four Nipponese scoots I work on.

If they are 34mm CV's, i think 2 1/2turns out used to be the norm from memory, at least on the Katana 34mm Cv Carbs.

MATCHLESS- re: message Post 136- settings spreadsheet

Marvelous work, sir. Being a new member, I searched the FAQs and found that posting. Sadly for moi & my 1982 GS1100GK2/USA (BS carbs), the idle adjustment screw setting says "preset". That's all I've ever seen, been told or discovered. All the other specs are spot on for my ride.

Anyone out there happen to know what that "preset" number of turns was-is? It pops, spits and snarls at all 1/4-turns up to 2-1/2 turns out.

This scooter was a provebial barn find, after someone decided to see what was inside the 4 carbs, and engine. Now I've the devil of a time getting those 4 things sync-d. And, yes, I have a factory-original manometer and the factory manual.

BTW, have never had this sync-ing prob with my '79 GS850G VMs, or with my shop's parts-bin-discovery of some smooth-bores now on that engine... or any other of the Big Four Nipponese scoots I work on.

from my readings I would say you have to set the pilots or mix screws with the "highest idle method".

http://extensions.services.openoffice.org/en/search/node/pdf

OpenOffice.org has a PDF compatible software (ODF) that allows you to do all the things adobe software does without paying hundreds of dollars.

http://download.openoffice.org/index.html

Haynes Manual GS850 Fours 1978-1988...

Still confusing to me on my 80 GS850N having the vm26's...

The GS850GN is a 1979 model and not a 80. The GS850GT had the CV carbs. Maybe you have a 79 registered in 80?

[mvalenti]

Per my Haynes manual....



Haynes Manual GS850 Fours 1978-1988...

Still confusing to me on my 80 gs850n having the vm26's...