• 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.

GS750 overheats ignition coils

  • Thread starter Thread starter Hman
  • Start date Start date
H

Hman

Guest
Hi, first time poster here.

I seem to have a problem for which searching yields no results. I own a 1979 GS750 that I bought in October last year. She runs well and gave me little trouble except that the battery seemed not to charge very well. I ignored this as the battery kept enough power to run the lights with the engine off, and to start the engine required one kick on the kick starter.

In January she suddenly started running roughly and inspection revealed that coil 1-4 died. I replaced both coils with good 2nd hand units and the problem was sorted or so I thought.

3 weeks ago both coils went and I noticed that with the ignition switched on the coils got very hot, but I thought they got hot because they died of old age. So again I replaced them with good used units ( I also redid the wiring before installing these coils to rule out possible wiring problems ) only to have them die the same death a week later.

I also noticed that the battery is now well and truly bricked, tested by refilling it with water and a little bit of acid, charging it and then testing it with a battery tester.

I've got a suspition that the regulator might have failed somehow and is supplying too high a voltage to the system or not switching the AC to DC properly.

What are your considered opinions, am I right in thinking that the RR is to blame? Any other suggestions?

PS. I will be replacing the coils with Dynatec units and will source the RR from duaneage, as well as fit a new battery.

Edit: Also globes don't seem to last very long.
 
Last edited:
You are overcharging. Get a meter and check the charge rate. BassCliff will be along with hs megawelcome, but I'll give you the shortcut to his site and you can peruse many articles on your problem.

http://members.dslextreme.com/users/bikecliff/

If I remember right, you have the two piece r/r. Duanage is the place to go for a replacement r/r, you got that right. Now, you'll need a new battery as well, I'm sure.

Welcome to the site, by the way, we need picts (of your bike) and where might you be located? It does help, there may be somebody around to help you out.
 
GS coils typically last the life of the bike. Are you sure they have failed? How did you test them?

As already mentioned, check the charging system voltage to see what's going on. Guessing sucks.

Even if the bike is overcharging, which is likely, it seems strange that the coils have been damaged.
 
Greetings and Salutations!!

Greetings and Salutations!!

Hi Mr. Hman,

Yes, your charging system is in need of troubleshooting/repair. A new battery is mandatory and you can't go wrong with one of Mr. duaneage's r/r units. You will have to modify your wiring a bit because you will be replacing separate regulator and rectifier units with a single integrated r/r unit. But don't worry, it's not difficult. It will actually simplify your wiring harness, at least in the charging system area. You will also need to perform the tests on the stator. See the Stator Papers for the all the background, theory, and troubleshooting procedures (links in your "mega-welcome" below). Then check the electrical section on my website for additional information, updated procedures, etc. You will also find "how-to" guides for stator and r/r replacement and testing.

Anyway, let me dump a TON if information on you and share some GS lovin'. :D

I just stopped by to welcome you to the forum in my own, special way.
big_hi.gif


If there's anything you'd like to know about the Suzuki GS model bikes, and most others actually, you've come to the right place. There's a lot of knowledge and experience here in the community. Come on in and let me say "HOoooowwwDY!"....
hat1.gif


Here is your very own magical, mystical, mythical, mind-expanding "mega-welcome". Please take notice of the "Top 10 Common Issues", "Top 15 Tips For GS Happiness", the Carb Rebuild Series, and the Stator Papers. All of these tasks must be addressed in order to have a safe, reliable machine. Now let me roll out the welcome mat for you...

carpet.jpg


Please click here for your mega-welcome, chock full of tips, suggestions, links to vendors, and other information. Then feel free to visit my little BikeCliff website where I've been collecting the wisdom of this generous community. Don't forget, we like pictures! Not you, your bike! :D

Thanks for joining us. Keep us informed.

Thank you for your indulgence,

BassCliff
 
They will get warm, with the ign on they are grounded thru the points. It is not a good idea to just leave the ign on... What type of coils did you put on ? If you get the Dyna coils, get the green 3 ohm coils and put a 2 ohm ballast resistor in the 12V supply line.
As said get the charging circuit fixed first...
 
Thanks for the replies, luckily I managed to get a hold of a bike mechanic that I trust, he wil check the bike for me and let me know what's wrong with her.

PS. I updated my profile to reflect my location. And without further ado I present you a pic of the beast :P



Uploaded with ImageShack.us
 
You must log in or register to reply here.
Back
Top