Carb OEM specs as per factory manuals

Warning!!

I am currently trying to get an 80' model 550 to run right. I have everything according to the manual. I have my doubts about main jet size according to the book. I tried 92.5's and I can't believe these bikes will run with that size mains. Low end is not bad but from 7k to redline there is nothing ! If anyone has experience with 550's and is sure what size works I would sure like to hear about it. The jets I have are Dangerously LEAN!!

[first timer]

this one frank!

Just what I needed. Thanks!

Any specs on '81 GS750E?

From my Suzuki GS750 service manual and its model specific supplements:

GS 750
1980- 81
LT/LX/EX Model

Carb ???????. BS32SS (4 separate carbs)
bore size ?????. 32mm (1.26)
id no ???????. 45400
idle r/min???.... 1050 +/- 100 r/min
fuel level ?????. 5mm +/- 0.5 (0.20 +/- 0.02)
float height ???? 22.4mm +/- 1.0 (0.88 +/- 0.04)
Main jet??????. 112.5
Main Air jet????? 1.7
jet needle?????.. 5C28
Needle Jet?????? Y-4
Pilot Jet??..????. 42.5
By-pass?.?????? 0.8, 0.8, 0.8
Pilot Outlet?????? .7
Valve seat?????? 2.0
Starter jet?????? 50
Pilot Screw............. Preset
throttle cable play ?. .5-1.0 (0.02-0.04)



GS 750
1982
EZ/TZ Model

Carb ???????. BS32SS (4 separate carbs)
bore size ?????. 32mm (1.26)
id no ???????. *45420
idle r/min???.... 1050 +/- 100 r/min
fuel level ?????. 5mm +/- 0.5 (0.20 +/- 0.02)
float height ???? 22.4mm +/- 1.0 (0.88 +/- 0.04)
Main jet??????. 112.5
Main Air jet????? 1.7
jet needle?????.. 5C28
Needle Jet?????? Y-4
Throttle Valve… *135
Pilot Jet??..????. 42.5
By-pass?.?????? 0.8, 0.8, 0.8
Pilot Outlet?????? 0.7
Valve seat?????? 2.0
Starter jet?????? 50
Pilot Screw............. Preset
Pilot air jet……….. 170
throttle cable play ?. 0.5-1.0 (0.02-0.04)
Choke cable play… *0.5-1.0 (0.02-0.04)

*Indicates new Z model spec

Any specs on '81 GS750E?

[wan3417]

Anyone has the settings for a '88 GSX600FJ Katana?

Ryan, here are the numbers for the 82/83 GS1100

GS 1100
1982-83
G, GL, GK Model

Carb ???????. Mikuni BS34SS (4 separate carbs)
bore size ?????. 34mm (1.34)
id no ???????. 49400
idle r/min???.... 1050 +/- 100 r/min
fuel level ?????. 5.0mm +/- 0.5 (0.20 +/- 0.02)
float height ???? 22.4mm +/- 1.0 (0.88 +/- 0.04)
Main jet??????. #115
Main Air jet????? 1.7
jet needle?????.. 5D58
Needle Jet?????? X - 3
Pilot Jet??..????. #40
By-pass?.?????? 0.9, 0.8, 0.8 (0.04, 0.03, 0.03)
Pilot Outlet?????? 0.7
Valve seat?????? 2.0
Starter jet?????? #50
Pilot Screw............. PRE-SET
Pilot Air Jet?????..#170
throttle cable play ?. 0.5 ? 1.0 (0.02, 0.04)
Choke Cable Play??. 0.5 ? 1.0 (0.02, 0.04)

This helped me out quite a bit.
Thank you.

1982 GS540 Carbs

1982 GS450 Carbs

The Mikuni BS34SS is a Suzuki OEM number, the actual carb is a VM34.

Stock jets:

Mikuni pilot jet part #004-003 (17.5)

Mikuni main jet part #004-291 (115)

www.sudco.com sells the jets, remember to resize jets if you modify the airbox or modify the exhaust system. I currently have K & N air filters and a 2 into 1 exhaust system. This bike runs best with:

22.5 pilot jets #004-005

and

125 main jets #004-295

Any Carb Specs For '85 Gs550e?

Hello guys, do you have any carb specs for 1985 GS550E? Would appreciate any info... Thanks

Did you ever get the Carbs specs?? I have a 1985 GS550E also.


.........................indiandn

Ok, Thank You

You're not going to get a 4 cylinder bike to run on one cylinder at a time. You can still adjust each mixture screw using the highest idle method. You need to consider a vacuum synch preceded by adjusting your valves.

OK.. I've finally got the carbs almost right after completely rebuilding. I've got the carbs so that they are just about burning cleanly. Does anyone have any objections, to isolate each carb from one another during fine tuning, to firing the bike one cylinder at a time by disconnecting spark plug wires to fine tune each carb to highest idle possible and burn clean but not too lean? I want to do this because I am having trouble determining which one is running rich. I know you can tell by the plugs, but I believe this would simplify the process. Thanks, Chris

Thank You. At least I know where to start now. Thanks again, Chris

I know this is an old thread but I have a question on the carbs for the 83 GS1100GKD. I had purchased the bike recently with the pilot screw (air screw, mixture screw setting?) on carb #1turned all the way down and the slot broken out. I finally got it drilled out, I didn't damaged the carb, but I have no idea where it should be set. Also I think the others have been messed with as well. I am running rich on all the carbs and my plugs keep getting gas fouled. I am currently waiting on the rebuild kits, thinking this may be alot of my problems. So my question is.. Is there a specific amount of turns listed anywhere? Thanks, Chris

There is no specific number of turns. If you get more than about 4 turns out then you need a bigger pilot jet to make the pilot circuit richer. Likewise if you have to close them down next to nothing then a smaller pilot jet is needed. Usually if the proper size pilot jet is installed then 1 1/2 to 2 turns out will be a good starting point. After that adjust each pilot screw for the smoothest, highest idle you can get out of each carb.

I know this is an old thread but I have a question on the carbs for the 83 GS1100GKD. I had purchased the bike recently with the pilot screw (air screw, mixture screw setting?) on carb #1turned all the way down and the slot broken out. I finally got it drilled out, I didn't damaged the carb, but I have no idea where it should be set. Also I think the others have been messed with as well. I am running rich on all the carbs and my plugs keep getting gas fouled. I am currently waiting on the rebuild kits, thinking this may be alot of my problems. So my question is.. Is there a specific amount of turns listed anywhere? Thanks, Chris