• 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.

1982 GS750T losing power

  • Thread starter Thread starter Squatch
  • Start date Start date
S

Squatch

Guest
So the other day I went for a nice ride with the wife and everything went well l. Got home and parked the bike for a couple hours. Decided to take it for another spin and got down the road 1/4 mile and the bike started to lose power at half throttle. Almost like it's starving for fuel. The carbs were cleaned at the shop this spring and I'm getting spark. Any suggestions?
 
What's the gas gauge indicate? If you're less than 1/4 tank, do as tkent suggest. (Do as tkent suggests anyways) If you're more than 1/2 tank and it's doing that, maybe you need a new petcock. I've had no issues with my "T" and have not needed to put the fuel petcock on RSV.


Ed
 
Last edited:
The tank is full of fuel and will sit and idle like a champ, it's just when I'm giving it more than half throttle.
 
Do you have a fuel filter? Check the vacuum line from the petcock to the #2 carb. Turn the petcock to reserve as tkent suggests. If it's starving for fuel, check all connections from the tank the petcock to the carbs. :)


Ed

EDIT: Even the throttle line. One time, I had a blockage that prevented revving. Check that the throttle cable isn't blocked.
 
Last edited:
OK so I changed the plugs today just to make sure it wasn't that and it's not firing on 2 cylinders.... could it be the coil? If so where would I find one?
 
Do a little trouble shooting before replacing parts as it always costs less to replace only bad parts than nilly-willy replacement. Which two cylinders are not firing? The Suz is a lost spark bike and two cylinders fire off one coil; that is 1&4 and 2&3. If you lost cylinders 1 & 2, that doesn't point to coils but something else. If you lost 1 & 4, then that points to a problem associated with that coil or the electronic ignition. If you lost 1 & 4, you could swap the leads from the igniter pickup coil and swap plug wires and see if the problem moves to the other two cylinder (2 & 3). If it does, it just may be the coil. If not, there is a problem with the igniter. Also, you may want to turn the key on and check to see if you have voltage to both coils. There are two plugs under your tank that have each two wires. One wire is from the igniter and the other is an orange/white wire that carries power from your kill switch to your coils. Unplug and use a test light or multimeter to see if you are getting 12V with the key on, kill switch on and bike not running. If you are getting no voltage on one of the two coils, this would indicate a bad connection.
 
OK so it's the two left side cylinders. Forgive me for not knowing what number cylinders those are... I'm kinda new at this. I've worked on cars all my life but this is the first bike I've ever worked on. Whatever it is it seems to be getting worse. It won't even idle now.
 
Last edited:
If it's the left two cylinders (1 and 2) then it's more then likely a fuel issue. Probably time to do a carb rebuild. If it were an ignition problem then it would be 1,4 or 2,3 effected. How did you determine that it's 1,2?
 
Because the manifolds for the two cylinders on the clutch side are cold and the two throttle side are hot
 
OK so I'm getting spark... it's gotta be a fuel issue... guess it's time to pull the carbs and see if I got some junk in them. They were cleaned and rebuilt this spring but coulda got some dirty gas or something I guess.
 
Squatch said:
Because the manifolds for the two cylinders on the clutch side are cold and the two throttle side are hot
Click to expand...

Yep, it sounds like it time for a carb rebuild.\

Just for reference, The cylinders are numbers 1-4, left to right, while sitting on the bike.
 
Thank you for the help. I'll post my results after I pull the carbs and get my hands dirty. Also I know this is off topic but I'd like to put a 4-1 exhaust on my bike. Where would be the best place to find one at a reasonable price.
 
Sounds like you're going for the gusto in a quick amount of time. Take care of the Carbs first...getting her up to par can be an enjoyable process once you take care of the essentials. How are the brakes? Do you have the old style rubber lines or are they braided? It's something to consider upgrading to but if you aren't having problems and the rubber doesn't look dry-rotted then carry on.

(I did a Master Cylinder rebuild and cleaned out all the gunk and did the braid install.)

I have a Vance & Hines 4-1 from Z1 Enterprises. You'll need to change the Main Jets...I went from 112 to 117. I must have gotten a great deal because the prices I see now are nowhere near what I paid.


Ed
 
I've been restoring the bike for 2 years now. She's my daily rider. It has new brake lines, brakes, calipers, chain, sprocket and I rebuilt the carbs this spring. I got the bike for free it was a garage queen and only had 5400 miles on it when I got it. My neighbor had it since it was new but dropped it low speed and it scared him so he put it in his garage and there she stayed until I bugged him enough about it. The "T" model to me is just a nice looking bike.
 
That's quite a score on a "T". You're preaching to the choir about the "looks" of this bike.

Did you do the 530 conversion on the chain/sprocket? I had to replace my exhaust so that's why I did the V/H 4-1. I also bought Progressive rear shocks at the same time I got the 4-1.

Carry on and post pics of your "T". Post em' on this thread too!

http://www.thegsresources.com/_foru...-2nd-Thread)-3rd-Overall-(I-think)&highlight=



Ed
 
Good deal! You saved yourself from mucking with ignition parts and are closer than you were to figuring this out. I would suggest checking compression as well and checking valve clearances. The Delmarvik exhaust seems to be one of the best deals if a 4 into 1 is in your future!
 
You must log in or register to reply here.
Back
Top