How many volts does it take to fire a spark plug? I've checked the hot wire to both coils & am getting only 10.7 V, thinking that's why tiny spark. Wiring dia. shows current flows from ign. switch thru kill switch then thru side stand switch then to coils. I'm thinking go backwards, next ck side stand current, inlet & outlet, then kill switch, inlet & outlet, then ign. switch inlet & outlet. All fuses look good, could a fuse cause low voltage? Appreciate all ideas.
-
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.
-
In order to help others find info on a particular bike, be sure to put the year, make or model of bike that you are asking a question about, in the Topic Title. This will allow people to pass by posts they have no interest in.
GSX1100G very weak spark
- Thread starter rphillips
- Start date
10 volts at coils is quite marginal, and is probaably power while cranking the starter motor, so , yes, this is probably the biggest reason for weak spark.your interpretation of the schematic is not entirely correct.main fuse, to ignition switch (r/r ties in along the way), back to ignition fuse(and two other fuses), to kill switch, to coils (and starter button, and igniter). My experience is loosing a portion of a volt at each step of the way, mostly in the wiring, not the ignition switch iteself. Others have found ore than a volt drop I. Just the ignition switch.if you want to prove to yourself that this low voltage at coils is what is caused g weak spark, as a test, run your own wire from battery pos (or main fuse) (or aux fuse) to the coils. If you have heard of the ?coil relay mod?, it is pretty much using a relay to jump power to the coils.
Last edited:
Thanks, a bit more info. I'm in a relatively not bright garage. First no spark with orig. JR9B plugs, Just for kicks, pushed in a D9EA from my GS1100 & could see a tiny spark, back to the JR9B, looked closer, no spark. Bought new JR9B's & still no spark. back to D9EA & still a tiny spark. I've checked & found the same on cyl. 1, 2, & 4. Both coils are equal readings, 3.1 oam from + to - 0n inlet end & 36.4 K oam checking from #1 thru # 4 plug wires. I didn't check the V on either while cranking. Diagram in my manual goes...Batt...25A fuse...ign. switch...10A fuse...side stand relay...Eng. stop switch...then "T" splits sends V to to the coils & to the ignitor power source circuit. Reading again, now thinking side stand relay may not be the side stand switch as I had thought. Dang I always have hated this electrical stuff.
Did it. Totally noticeable difference in starting. Use to have to crank it a bit to get fire. After the mod... it pops right off.
Been looking & reading & getting more confused. I'm pretty simple minded & wondering if while I have the tank, seat, side panels etc. off, can I just (temporarily to see if it gets good spark & starts) connect a jump wire from batt + to orange coil wire. If this fixes the spark thing, then more searching the relay mod is in order, if it doesn't fix the spark thing, look somewhere else. Does this make sense or a dumb idea?
Oh..... a 1991... I didnt notice that (even though you did say GSX). Yah that schematic is different, having much different interlocks. So disregard my description of the schematic.
Yes, can jumper power to the coils (or at least can on 1980s GS), as described in post #3.
Yes, can jumper power to the coils (or at least can on 1980s GS), as described in post #3.