• Required reading for all forum users!!!

    Welcome!
    Register to access the full functionality of the GSResources forum. Until you register and activate your account you will not have full forum access, nor will you be able to post or reply to messages.

    A note to new registrants...
    All new forum registrations must be activated via email before you have full access to the forum.

    A Special Note about Email accounts!
    DO NOT SIGN UP USING hotmail, outlook, gmx, sbcglobal, att, bellsouth or email.com. They delete our forum signup emails.

    A note to old forum members...
    I receive numerous requests from people who can no longer log in because their accounts were deleted. As mentioned in the forum FAQ, user accounts are deleted if you haven't logged in for the past 6 months. If you can't log in, then create a new forum account. If you don't get an error message, then check your email account for an activation message. If you get a message stating that the email address is already in use, then your account still exists so follow the instructions in the forum FAQ for resetting your password.

    Have you forgotten your password or have a new email address? Then read the forum FAQ for details on how to reset it.

    Any email requests for "can't log in anymore" problems or "lost my password" problems will be deleted. Read the forum FAQ and follow the instructions there - that's what we have one for...

  • Returning Visitors

    If you are a returning visitor who never received your confirmation email, then odds are your email provider is blockinig emails from our server. The only thing that can be done to get around this is you will have to try creating another forum account using an email address from another domain.

    If you are a returning visitor to the forum and can't log in using your old forum name and password but used to be able to then chances are your account is deleted. Purges of the databases are done regularly. You will have to create a new forum account and you should be all set.

1980 GS1100, odd mods by PO

  • Thread starter Thread starter DFWSpeedster
  • Start date Start date
D

DFWSpeedster

Guest
Hey everyone, I'm new here. I just picked up a 1980 GS1100E from a college student who got it from his uncle. He didn't know a thing about bikes, never touched it, and sold it to me since he found a job in maryland.

Anyways, the gas tank was left with gas sitting in it for a long time. The liner is peeling off quite badly, and there is a little bit of surface rust. (I'm thinking of dipping the entire thing in muriatic acid?)

The PO installed a 4-into-1 V&H exhaust, a k&n drop in filter, and took off the airbox cover while not changing the jetting. I disassembled the carbs, dipped them, replaced the o-rings and plan on using a 122.5 main for that setup.

Now I don't know much about the petcock setup on this bike, but the PO has blocked off the fuel return line to the tank (pardon my ignorance) with a screw. Would this yield any benefits?

TL;DR - PO blocked off carb fuel return line, what's the point?

 
Last edited:
Do you have a petcock without a lever ? (I hope not !).That blocked off line is a vacuum connection that automatically (in theory) allows fuel to flow from petcock just when engine is running. Maybe PO thought it was leaking, but the leverless petcock needs coaxing to get going ,so if it is leverless someone might have fiddled with its innards .
 
DFWSpeedster said:
Hey everyone, I'm new here. I just picked up a 1980 GS1100E from a college student who got it from his uncle. He didn't know a thing about bikes, never touched it, and sold it to me since he found a job in maryland.

Anyways, the gas tank was left with gas sitting in it for a long time. The liner is peeling off quite badly, and there is a little bit of surface rust. (I'm thinking of dipping the entire thing in muriatic acid?)

The PO installed a 4-into-1 V&H exhaust, a k&n drop in filter, and took off the airbox cover while not changing the jetting. I disassembled the carbs, dipped them, replaced the o-rings and plan on using a 122.5 main for that setup.

Now I don't know much about the petcock setup on this bike, but the PO has blocked off the fuel return line to the tank (pardon my ignorance) with a screw. Would this yield any benefits?

TL;DR - PO blocked off carb fuel return line, what's the point?
Click to expand...

Bike looks nice, but a larger picture we would be able to confirm that fact for you(hint hint) :pray:

Sounds like about the right thing on the jetting. By the time you go to PODS4:1 you would need the DJ132 with a 47.5 pilot jet. There is a guy now posting with a 83 GS1100ED (more lift on the intake cam) and at sea level he is lean running the DJ132. So he should probably go to the DJ138.

So if anything without pods, the 122.5 might even be a little rich but let us know.
 
DFWSpeedster said:
Hey everyone, I'm new here. I just picked up a 1980 GS1100E from a college student who got it from his uncle. He didn't know a thing about bikes, never touched it, and sold it to me since he found a job in maryland.

Anyways, the gas tank was left with gas sitting in it for a long time. The liner is peeling off quite badly, and there is a little bit of surface rust. (I'm thinking of dipping the entire thing in muriatic acid?)

The PO installed a 4-into-1 V&H exhaust, a k&n drop in filter, and took off the airbox cover while not changing the jetting. I disassembled the carbs, dipped them, replaced the o-rings and plan on using a 122.5 main for that setup.

Now I don't know much about the petcock setup on this bike, but the PO has blocked off the fuel return line to the tank (pardon my ignorance) with a screw. Would this yield any benefits?

TL;DR - PO blocked off carb fuel return line, what's the point?
Click to expand...

There is no fuel return line, so it has to be the vacuum line from the #2 carb to the petcock or he has blocked off the overflow line from the tank. Your carbs also have two vent lines that route to under the seat. You do have the ick leverless vacuum petcock (pain in the butts they can be). As far as the 4into1, and drop in K&N filter, all I would do is up the main jets and put the air box cover on and not mess with pods. I have the same set up on my 750, 4into1, drop in K&N, and upped the jets. Runs just fine. Just make sure all the rubber boots are sealing up along with the air box. Air leaks can be quite the problem. Oh yeah don't forget to set the idle mixture and do a sync on the carbs. What about the valves, any idea when they were last adjusted? If not do them as well.
 
Last edited:
mrbill5491 said:
There is no fuel return line, so it has to be the vacuum line from the #2 carb to the petcock or he has blocked off the overflow line from the tank. Your carbs also have two vent lines that route to under the seat. You do have the ick leverless vacuum petcock (pain in the butts they can be). As far as the 4into1, and drop in K&N filter, all I would do is up the main jets and put the air box cover on and not mess with pods. I have the same set up on my 750, 4into1, drop in K&N, and upped the jets. Runs just fine. Just make sure all the rubber boots are sealing up along with the air box. Air leaks can be quite the problem. Oh yeah don't forget to set the idle mixture and do a sync on the carbs. What about the valves, any idea when they were last adjusted? If not do them as well.
Click to expand...




Here is the location of the blocked off line and a picture of the petcock. I've learned the hard way with pods on CV carbs, so I'll stick with the airbox for now.
 
Last edited:
posplayr said:
Bike looks nice, but a larger picture we would be able to confirm that fact for you(hint hint) :pray:

Sounds like about the right thing on the jetting. By the time you go to PODS4:1 you would need the DJ132 with a 47.5 pilot jet. There is a guy now posting with a 83 GS1100ED (more lift on the intake cam) and at sea level he is lean running the DJ132. So he should probably go to the DJ138.

So if anything without pods, the 122.5 might even be a little rich but let us know.
Click to expand...

I got the 122.5 from a V&H 4-into-1 instruction sheet I remember looking at, I believe it said to remove the airbox lid and run a 122.5 main. However, I could be wrong

Also, updated the OP with a bigger picture!
 
Same bike & setup, with the airbox top off I run 115 Mikuni jets {dynojet jets are not the same number to number as mikunis are } and 3 turns out on the mixture screws and a dynojet needle set in the middle notch. Im at 3500 ft here though
 
Katarat said:
Same bike & setup, with the airbox top off I run 115 Mikuni jets {dynojet jets are not the same number to number as mikunis are } and 3 turns out on the mixture screws and a dynojet needle set in the middle notch. Im at 3500 ft here though
Click to expand...

Hmmm, well I do recall now that when I cleaned the carbs the main jets were 114's. Is that the stock configuration?
 
114 sounds like a DJ size, where the Mikunis come in 2.5 increments from what I've seen over the years. Maybe the PO installed a DJ stage 1 kit, but since the sizing is different between the two, that 114 might be closer to a 110 Mikuni or less. No expert here though. Can't remember what stock 1100 jetting was-107.5? I think I ran 115 Mikunis, shimmed the stock needle, drop in K&N with lid off and RC Engineering 4-1 on my 80 1100ET.
 
Dynojet 114s are the same size as Mikuni 107.5.

The stock main jet on the '80/'81 1100E was 107.5.

Would you mind translating "TL;DR" into English, please? :-k

.
 
Steve said:
Would you mind translating "TL;DR" into English, please? :-k

.
Click to expand...

Too Long; Didn't Read

Internet shorthand for 'if you're either functionally illiterate or can't be arsed, here's a summary.'
 
114 is not a Mikuni size, it is a Djet size. Mikuni would be 112.5 then 115 then 117.5
 
That's not a vacuum petcock, nor is it a fuel return line. The line from the carb that's blocked off is the vacuum that would activate the stock petcock. Since you don't have a vacuum petcock, don't worry about it.
 
I notice in your name you are in DFW Texas right? I hope you aren't the guy posting to sell parts off that great looking machine. I would certainly buy it to save it from being chopped up.
 
off topic, but......

off topic, but......

By the way, those case guards are quite hard to come by. Great looking ride also.
 
Last edited:
Gregory said:
I notice in your name you are in DFW Texas right? I hope you aren't the guy posting to sell parts off that great looking machine. I would certainly buy it to save it from being chopped up.
Click to expand...

No I'm not that guy! I plan on keeping this thing stock for the most part, (minus the headlight and seat)
 
Anyways, the valve cover gasket finally came in, and I fired it up only to hear this noise. I also took the clutch cover off to replace the gasket. And now the clutch won't engage. I've adjusted the cable as much as I can, and it still won't.
http://youtu.be/f6BomS_koSs

Excuse the orange strap, it's holding on the tank from my VS800
 
Last edited:
Clutch hub nut loose? They are known to stretch, even with lock tab washer. Backing plate springs loose.

The rack release arm may have engaged improperly when the cover was off. What orientation is the clutch arm on cover?
 
You must log in or register to reply here.
Back
Top