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What size jets should I have on my GS

  • Thread starter Thread starter Chum
  • Start date Start date
C

Chum

Guest
I'm rebuilding the carbs on a 1982 GS750E that I recently picked up and am concerned about jet size. The bike is fitted with pod filters and an aftermarket exhast. With that in mind, I'm sure I'll need to rejet these carbs but some members have expressed that they may have already been changed. What size are the OE jets, and what size should they be with the mods mentioned?
Thanks Chaps!
 
you will find the answer here

http://members.dslextreme.com/users/bikecliff/images/carbspec_float_height.html

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

.
 
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Those are, obviously, the stock sizes. What should you have in there now? That depends on your pods and your pipe.

General rule of thumb is to add 2-4 sizes for a pipe and another 3-6 sizes for pods. That will depend on how free-flowing the pipe is and whether you have good pods or junk.

Ultimately, your spark plugs will tell you whether you are jetted correctly.

.
 
Hi,

Chum said:
Wow, that's a great lead. Thanks GateKeeper.
Click to expand...

Doesn't anybody ever actually read their "mega-welcome"? :p

Mr. Chum, you received yours in THIS THREAD, your introductory thread. I hope you take the time to go through all the links and all the information available. It will save you money, save you time, grow your hair, help you lose weight, make you taller, give you more stamina, make you regular, and you will be more popular with the ladies. :dancing:

We love to share the love around here. :D



Thank you for your indulgence,

BassCliff
 
Bass, I do still read the big welcome. I go back to that thread multiple times a day. There is no way to get through it all so I missed your direction to this answer there and for this I am eternally sorrowful! HA. Thanks guys.
 
Hi,

Chum said:
Bass, I do still read the big welcome. I go back to that thread multiple times a day. There is no way to get through it all so I missed your direction to this answer there and for this I am eternally sorrowful! HA. Thanks guys.
Click to expand...

Sorry to give you a hard time, just yanking your chain. Yes, I know there is quite a bit of information on my little website and it's not organized very well. One of these days I will redesign it. Feel free to bookmark my website and explore all the links. You may be surprised what you find. ;)


Thank you for your indulgence,

BassCliff
 
In for results...I too am running a 4-1 and pods on my '82 GS750E. I posted earlier looking for some ballpark jetting advice but nothing so far...:-\\\

I'm started with the initial DynoJet Stage 3 kit + their recommended settings but its way too rich for my setup. I've got it at least drive-able by lowering the needle by 1 notch (before it wouldn't go above 4k), but I think my mains are still a little too big for WOT (still doesn't pull hard in the top range) so I'm gonna experiment with a smaller main and raise the needle back up.
 
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spwalker09 said:
In for results...I too am running a 4-1 and pods on my '82 GS750E. I posted earlier looking for some ballpark jetting advice but nothing so far...:-\\\

I'm started with the initial DynoJet Stage 3 kit + their recommended settings but its way too rich for my setup. I've got it at least drive-able by lowering the needle by 1 notch (before it wouldn't go above 4k), but I think my mains are still a little too big for WOT (still doesn't pull hard in the top range) so I'm gonna experiment with a smaller main and raise the needle back up.

FWIW - when I disassembled my carbs, I found Mikuni 115 mains. Bike ran great and had the stock airbox/exhaust. Methinks a previous owner found the factory settings a little too lean, and went higher on the mains to compensate.
Click to expand...

did you not get 2 main jet options in the dj kit? most stage 3 kits come with 2 different size jet options.
 
BassCliff said:
Hi,



Sorry to give you a hard time, just yanking your chain. Yes, I know there is quite a bit of information on my little website and it's not organized very well. One of these days I will redesign it. Feel free to bookmark my website and explore all the links. You may be surprised what you find. ;)


Thank you for your indulgence,

BassCliff
Click to expand...

No Sweat. Just messing back. I'm afraid to get too deep into it because I won't remember the way back when I really need specific info. Great stuff you got there, Thanks
 
It appears you guys favor the DJ kits, but I took the advice of another member and ordered a kit from 6Sigma. I'll keep you posted on the results. I think the jets in my carbs are already larger than stock and I may not need the kit, but their ordering process seems to ensure jetting taylored to my set-up. We'll see and I'll let you know how this kit works out.
 
Agemax said:
did you not get 2 main jet options in the dj kit? most stage 3 kits come with 2 different size jet options.
Click to expand...

Yessir I did. The DJ130s (Mikuni equiv. 122.5 according to JetsRUs) mains are recommended for 4-1 + pods. For just pods with stock exhaust, they supply DJ124 jets (in-between Mikini 115 and 117.5). I have the DJ130s installed right now, with the needle clip installed 3rd from the top (DJ recommended is 4th from the top)
 
spwalker09 said:
Yessir I did. The DJ130s (Mikuni equiv. 122.5 according to JetsRUs) mains are recommended for 4-1 + pods. For just pods with stock exhaust, they supply DJ124 jets (in-between Mikini 115 and 117.5). I have the DJ130s installed right now, with the needle clip installed 3rd from the top (DJ recommended is 4th from the top)
Click to expand...

if yours is to rich, drop to the 124's and raise the needle back up again. that should be better......:)
 
spwalker09 said:
Yessir I did. The DJ130s (Mikuni equiv. 122.5 according to JetsRUs) mains are recommended for 4-1 + pods. For just pods with stock exhaust, they supply DJ124 jets (in-between Mikini 115 and 117.5). I have the DJ130s installed right now, with the needle clip installed 3rd from the top (DJ recommended is 4th from the top)
Click to expand...

I has a basically stock California 81 GS750EX with stock exhaust and stock pipes. When it has a K&N filter element in the air box (with the top on) it ran a tad lean but ran quite well throughout the RPM range with the stock 112.5 Mikuni mains..

After a rebuild, lap in valves, new rings and split cases I changed out the cams for a 80-82 1100E Intake came that has a little moor lift. It hesitated and wanted more gas, so I dropped in a spare set of DJ 124's (approx 116 Mikuni equiv) and it ran great. This is still with 4:2 stock exhaust and the K&N filter in the box.

I'm wondering why you don't need more main than the DJ 124 with pods and 4:1? :confused:

Have you cleaned those pods and go light on the oil? Pods make the biggest diff as Steve relayed.

For example on the GS1100E 16V when going to pods and pipe the stock Mikuni 110-112.5 are bumped up to about 132 or more likely 138 DJ mains.
 
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spwalker09 said:
I posted earlier looking for some ballpark jetting advice but nothing so far...:-\\\
Click to expand...
You are lucky you got some answers. Usually, hijacking someone else's thread gets everybody all confused as to which one they are addressing.
icon_shrug.gif


.
 
Steve said:
You are lucky you got some answers. Usually, hijacking someone else's thread gets everybody all confused as to which one they are addressing.
icon_shrug.gif


.
Click to expand...

Didn't mean to hijack, I was merely interested in peoples' suggestions relevant to the OP, who is running the same year, model, and mods
 
spwalker09 said:
Didn't mean to hijack, I was merely interested in peoples' suggestions relevant to the OP, who is running the same year, model, and mods
Click to expand...

he does have a point there Steve. as it is the same year and model bike, why not join in. if he started a new thread the only answers he would get would be "check out the other thread, he has exactly the same bike as you"........ ;)
 
Hey I have a 85 gs 700 with kinda cheap k&n nock offs and factory exhaust. I have the main jets at 130 and I bumped the secondary (smaller one) to 40 and the bike still seams to be running lean. It still takes starting fluid to get going and runs better when your hands are over the carbs and as it heats up. So does anyone have a jetting recommendation for this situation?
 
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