Carb Jetting List

[Guest]

Ok, I'm starting a new thread that is solely for listing your carb jetting/settings for your modded out GS. If everyone can do their best to follow a specific format it will help future GS racer wannabe's find a good starting point. So the format is

Model of your bike
Engine and any mods done
Type of exhaust
Type of airbox/pods
Type of carbs
Carb settings
Elevation
How the bike runs with this setup

 

[Guest]

1978 GS1000C
Stock 1000
Marving 4 into 1
K&N pods
VM29mm smoothbores
main jet 117.5
pilot jet 17.5
1.5 cutouts
mixture screws are about 1 turn out
I'm at sea level
Bogs a bit when opening up the throttle but then pulls hard to redline and beyond

 

[Guest]

I can't be the only person who thinks this would be a good idea....

 

[Rob S.]

I agree with you 100%.

And I think my Suzi's settings would be a useful contribution to this database, considering that she was jetted on a dyno, and runs perfect.

My tuner said he would give me the info, but reminded me that I paid hundreds of dollars for it, and asked if I just wanted to divulge it for free.

I was a little taken aback, but told him that most of the members here were from the Midwest, or otherwise out of contention to be customers of his. He told me that all bikes are different, and again asked if I wanted to give away info that I paid so much for.

Bottom line: I don't have the figures yet, but I'm working on it. And the minute I get them, I'll pass them on.

 

[simonw]

1981 GS850G
Stock Engine all valves clearances done recently
4into1 open pipe no can
4 Pods
BS34CVs Rebuilt with new orings
200 Air Jet
120 Main
42.5 Pilot around 4 turns
Sea Level
Idles fine, Massive flat spot in mid range dubious open throttle...
needs a lot of tuning starting with bigger mains, 130's maybe...will keep this updated

 

[78550GS]

1978 GS550E
Stock engine, 81gs750 signal generator coils and ignitor
Stock exhaust
emgo pods
VM22 Mikunis needles adjusted one notch up
stock jets except mains, bumped to 105(still tuning) fuel screws at 1 turn, air screws at 1.25 turns (also still tuning)
NE Ohio elevation? will check and edit
Just started tuning yesterday, pulls damn hard above 2k, VERY slight stumble taking off, feels like it runs out of legs above 7500

Hope this helps someone else.

 

[Old guy]

1981 gs650

modified air box and filter

baffles drill in exhaust

pilot 45 (stock 42.5) (May go to 47.5) see below

main jet 112.5 (stock 110) May go 115

screws 2.5 turns out, rich at idle trying to cover very slight low rpm low throttle stutter, pilot jet should fix it

needles shimmed to lower needles, stock jets too lean above 8k, but with larger jets, too rich at mid throttle

runs really well

currently looking for a newer katana 600 or 750 to swap suspension and motor

 

[Old guy]

1978 GS550E
Stock engine, 81gs750 signal generator coils and ignitor
Stock exhaust
emgo pods
VM22 Mikunis needles adjusted one notch up
stock jets except mains, bumped to 105(still tuning) fuel screws at 1 turn, air screws at 1.25 turns (also still tuning)
NE Ohio elevation? will check and edit
Just started tuning yesterday, pulls damn hard above 2k, VERY slight stumble taking off, feels like it runs out of legs above 7500

Hope this helps someone else.

Go up on the main until full throttle high rpm clears up. Then go larger until it sputters again, then start lowering the needle by putting washers on top of the needle

 

[Spyderman]

1978 GS1000 EC Skunk
1000 cc lots of head work including port and polish,degreed cams
braced frame and swingarm
steel braided front brake lines
Dyna S ignition
hindle competition pipe
K&N oval pod filters
29MM smoothbores
pilot jets: VM22/210 #27.5
mix screws between 1 and 2 turns out (cylinder Dependant according to plugs)
needle 5DL31-3
Needle Jet O-6
main jets: N100/640 big rounds #115
throttle valve cut away 2.0
float 24MM
altitude : 3600 ft
How the bike runs with this set-up : really well it has kept me happy for 23 years

 

[Guest]

I can't be the only person who thinks this would be a good idea....

This is a great idea, I'll post up my "81 1100E settings when I get home & consult my notes... still working on a couple of issues so this thread should be helpful.

 

[blowerbike]

I agree with you 100%.

And I think my Suzi's settings would be a useful contribution to this database, considering that she was jetted on a dyno, and runs perfect.

My tuner said he would give me the info, but reminded me that I paid hundreds of dollars for it, and asked if I just wanted to divulge it for free.

I was a little taken aback, but told him that most of the members here were from the Midwest, or otherwise out of contention to be customers of his. He told me that all bikes are different, and again asked if I wanted to give away info that I paid so much for.

Bottom line: I don't have the figures yet, but I'm working on it. And the minute I get them, I'll pass them on.

no secrets with a st.3 jet kit.
a little smoke blowing IMO.
not by you Rob but by the person acting like this info is top secret.

 

[gustovh]

Here goes again

1980 GS1100L
82 1100E engine
DJ stage one
clip on the 3rd notch from the bottom, no washer
47.5 pilot jets
1 1/2 turns on pilot screw
pods, un known brand
Jardine 4/1

Pulls strong all gears, no flat spots, 42 mpg average 49.8 best

 

[niclpnut]

83 GS 1100es KCMO

1150 cams
yosh 4-1
k&N pods
Dyna 2000 ignition and coils
Polaris regulator
Coil relay mod
Stock carbs

DJ Stage 3
DJ 132 mains
47.5 pilot
2nd clip from bottom
4.5 turns out

Started out with 138 mains but was running very rich.

Pulls evenly and strongly through every gear and rpm range with no hesitations.

 

[huntb]

Model of your bike - 1981 GS650E
Engine and any mods done - Stock
Type of exhaust - MAC 4 into 1 with competition baffle
Type of airbox/pods - Stock with drop in K&N
Type of carbs - Stock
Carb settings - 102.5 main, pilot screws at 3.0 turns, needles raised 1.0mm
Elevation - 600'
How the bike runs with this setup - Pulls great through entire RPM range, but I will still continue to tweak it

 

[JJ]

What's with the pale font? You don't like people reading your posts?

 

[huntb]

Huh weird... I was using the dark theme (Avenger) for the forum and I guess the default font is pale like that. I think it happened because I copied and pasted the OPs post and that's the font color it was with the Avenger theme. Maybe I can fix it...

Edit: Fixed it

 

[JJ]

No biggie.. I just wondered.

 

[78550GS]

1978 GS550E
Stock engine, 81gs750 signal generator coils and ignitor
Stock exhaust
emgo pods
VM22 Mikunis needles adjusted one notch up
stock jets except mains, bumped to 105(still tuning) fuel screws at 1 turn, air screws at 1.25 turns (also still tuning)
NE Ohio elevation? will check and edit
Just started tuning yesterday, pulls damn hard above 2k, VERY slight stumble taking off, feels like it runs out of legs above 7500

Hope this helps someone else.

After playing a bit with it, I found a small leak in the exhaust. And I need to adjust the valves. Will update more when those are done and I dial it in.

 

[Rob S.]

no secrets with a st.3 jet kit.
a little smoke blowing IMO.
not by you Rob but by the person acting like this info is top secret.

This winter I'll be throwing him another grand or two of work (valve check, tune up, SS brake lines, rear suspension, possibly cartridge emulators, elec. repairs), so I'll put the request for all the carb details in the work order.

Even if he "lost" the details, if he removes the carbs for cleaning (and to loosen up the choke so I can work it from the handle bar), won't all the jettings and settings be there for him to see and write down?

Although I suppose it's possible the carbs may need to be re-jetted once they've been cleaned. Is that likely?

 

[Guest]

This thread isn't intended to be here for 'banter', if everyone could just focus on posting their bike with the carb settings it would be best.