Carb OEM specs as per factory manuals

[Juob]

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

 

[txironhead]

Just what I needed. Thanks!

 

[first timer]

this one frank!

 

[REDDY]

Warning!!

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!!

 

[Bud]

Missed the sticky somehow.

Looking for the info on my 86 550L. Pilot and needle jets, if there is 2 different needle jets in the same carb, what one is what? strange carbs, could have some strange settings. Float height. Needle? Needle setting?

 

[veda_sticks]

Is the pilot screw refering the the screw on the bottom of the carb?? I have been trying to figure out wot this screw does, haynes does not mention it and my other manual on cd-rom just says, do not touch. If this is the pilot air screw, then great cause i doubt that it is set right and may be why my bike just wont run right.

so when i turn this screw out is it allowing more fuel or more air?? Im guessing more fuel as it is a mixture screw.

 

[SPOT1000KAT]

CV Tuning Link

CV Tuning Link

Hi Folks,

found this link on fine tuning CV's which looks like it might come in handy for some.

http://www.factorypro.com/tech_tuning_procedures/tuning_carbtune,CV,high_rpm_engines.html


Cheers,

Spot

 

[blackwolf]

Would this be the same for a 1980 gs850l?

 

[MelodicMetalGod]

Any update?

Any update?

This thread has a lot of great info. Has anyone completed compiling the info into a more organized presentation?

PS: I'll add 1985 GS550E/ES specs for Mikuni BSW30SS twin two-barrel carbs soon.

 

[Jackw]

83 GS550E
Mikuni
BSW30SS
30 mm

It should have 43410 stamped on the side

Fuel level: 6.5 +/- 0.5mm (.26 +/-.02in)
float height: 20.5 +/- 1.0mm (0.81 +/- .04in)
Main jet:
cylinders 1 and 4: 95
cylinders 2 and 3: 102.5
main air jet: 1.0
Jet Needle: 5C64
Clip position: 1 groove from top
needle jet: P-2
Throttle Valve: 120
Pilot Jet: 35
Bypass: 0.8,0.7,0.8,0.8
Pilot outlet: 0.7
Float valve seat: 2.5
starter jet: 55
Pilot screw: Preset

Quick one, 2 of my clips are on the 3rd groove from the bottom and the otehr 2 clips are 2 from the bottom? Is this the proper setting? This post siad 1 groove from the top? the carbs have different size main jets so are the clip positions different to match the different jet sizes?

Thanks

 

[MelodicMetalGod]

For 83 GS550E & ES. As promised...enjoy!

 

[samson66048]

I have more of a question

I have more of a question

I have a 1980 GS1100. Love the bike, however I do have one problem. When I first start bike and ride, it runs fantastic, but after it gets warm, it tends to die if I come to a stop. So, I nurse the throttle when at a stop, and it is very sluggish, feels like it is loading up. Any ideas?? I just finish tearing down the carbs and cleaned them in hopes it would correct it. No luck. HELP

 

[BassCliff]

1980 GS850GT carb specs

1980 GS850GT carb specs

Do you have these already?

GS850GT carb specs

Thank you for your indulgence,

BassCliff

 

[Rustybux]

carb oem spec as per factory manuels

carb oem spec as per factory manuels

Of course, I dont know what all the numbers mean for float level such as float height 24.+/-1.0 (0.95 +/-0.04). Needs to have more information as they do on cars like "float height 3/8 inch"

 

[BassCliff]

The legend in the upper right hand corner says:

Unit: mm (in)

I would assume that means 22.4mm +/- 1.0mm or 0.88 inches +/- 0.04 inches for the float height. Doing the math, that's roughly 7/8" +/- 1/32".

I was told there would be no math today. :-D

Thank you for your indulgence,

BassCliff

 

[endlessGSgeek]

BS34 for 81 GS1100G

BS34 for 81 GS1100G

I'd like to know what the stock GS1100G settings are (were, that is). George Lesho rebuilt my BS34 rack (after three months and sent me someone else's BS32 for a GS850G!). I was told he was a real professional, but he didn't even send a single piece of documentaion back with them. I expected notes on the rebuild, and at the ver least, a jetting report. I did pay the extra $28 for rejetting. I synchronized them and borrowed my buddy's colortune for airscrew adjustment, but I sure would like to know what was in there, and what is in there NOW!!

Anybody have 81GS1100G jetting info (OEM)??

 

[endlessGSgeek]

factory manual??

factory manual??

Bass Clef.. Where the heck did that info come from ? It looks like a table out of a factory manual.

 

[BassCliff]

Bass Clef.. Where the heck did that info come from ? It looks like a table out of a factory manual.

Mr. endlessGSgeek,

I have a manual in pdf format. I have a couple others in hard copy that I can scan when necessary. Sometimes it's easier to copy/paste/upload/post the specific information when a picture is worth a thousand words. I hope I'm not violating copyright when posting little bits like that.

Thank you for your indulgence,

BassCliff

 

[endlessGSgeek]

pilot AND needle height shim for low end rescue

pilot AND needle height shim for low end rescue

Mr. endlessGSgeek,

I have a manual in pdf format. I have a couple others in hard copy that I can scan when necessary. Sometimes it's easier to copy/paste/upload/post the specific information when a picture is worth a thousand words. I hope I'm not violating copyright when posting little bits like that.

BassCliff

I am sure you have nothing to worry about BaseCliff.

Lots of very useful tips in this thread. Thanks to all. The BS34 and smaller BS series Mikunis are good performers, but I have heard lots of nightmares about getting the low rpm range to behave. It is a high performance engine, and has to have intake valves (in particular) opening at the right time (clearance), need to be synchronized, need to have the right pilot jet to start with if you want it to behave when it isn't making much power. This is because power output needs to be balanced across the four cylinders. If two or three cylinders are not working as hard as others at low rpm because of jetting or synchronizing, YOU NOTICE IT!

I recently got a Morgantune (CarbtunePro) and synchronized my 1982 GS1100G. I have pod filters and a low restriction dual exhaust system (4into 2). George Lesho upped the main jet to a 150, and it DOES launch willingly above 4500rpm when it is warmed up (Jeez). Anyway, MUCH better after synchronizing, but still cold blooded as heck! Coughs and sputters below 2500 rpm, and even shows signs of being to lean when gently cruising at 3-4000rpm. I tried a Colortune, but it didn't fire near idle (not really a spark plug), so I could only guess on the airjets. I think I need to install one size higher, and maybe lift the needle by one ring.

Am I on the right track? Getting the needle to lift slightly soone may solve it, but It is SOOO cold blooded, it really seems to need a bigger pilot jet. Full choke, even when it is warm. High end performance is good though (main jet OK). I think it needs both needle shim (maybe one ring) and bigger pilot jet, because it won't idle and needs FULL choke when it shouldn't (pilot jet symptoms) and coughs and sputters at modest speeds cruising (needle not high enough). Can any body advise me on this??

I am really getting desparate

 

[BassCliff]

Hi Mr. endlessGSgeek,

I'm really sorry but I haven't learned the finer points of carb tweaking. This is something that is probably better posted in your own "technical repair" thread rather than sticking it here in this "carb spec info" thread. It might get a little more attention. I wish you all the best.

Thank you for your indulgence,

BassCliff