1 & 4 not fireing

[Paul F]

1982 GS1100EZ.
Cylinders 1 and 4 are not fireing. I changed the coils last year. They should be OK. Can the brushed cause this problem?
Any help would be appritiated. Thanks

[salty_monk]

1 & 4 are fired by the same coil so that would be my first option even if you have changed them...

Easy way to tell is to swap the leads over if long enough & see if the problem now moves to 2 & 3.

I can't think of anything else that would only affect these 2 cylinders unless there's a big coincidence.

How about the wiring to the coils? That may have broken down or something or dodgy connection.

Dan

[Paul F]

Hey, thanks for the reply. I am not sure if I have the cylinders correct. The ones that are not fireing are the two on the outside of the motor. Not the two insider cylinders. Are these one and four?

[dpep]

1982 GS1100EZ.
Cylinders 1 and 4 are not fireing. I changed the coils last year. They should be OK. Can the brushed cause this problem?
Any help would be appritiated. Thanks

Check the connections and ground on that coil. A problem I had was the bolt mounting the coil was too close to the terminal in and was shorting away the juice. Try running it in the dark with the tank off to look for any arcing.

[Paul F]

I think I am ment to ask about the pick up coils under the alternator cover. Will bad pick up coils cause the problem I am having. Where is a good place to purchase pick up coils on Line?

[Thomas Kenny]

Yes, 1 and 4 are the outside cylinders. As you sit on your bike 1 is on the left end 2 is inside left, 3 is inside right and 4 is on the right end. I am trying to sort out the same issues on my GS550ES and have tracked mine down to the igniter unit. Hope you find a less costly fix for yours. :-) Tom

[Steve]

If you find that it IS your igniter, take a good look at the number on it.

I have one that I don't need, it has Suzuki part number 32900-49410.


.

[Paul F]

Steve,
is that ignitor unit for a 1982 GS1100EZ?

[chef1366]

Underneith your contact cover (round cover on right side of motor) open it up and check the wiring all the way to your battery box area. The wire runs underneith the right side of the motor behind the frame hooked on the motor. I once found a wire broke off at the signal generator. This would effect either 1 and 4 cylinders or 2 and 3. First I would switch the coils up and see if the problem follows. I really doubt it's the igniter.

[Thomas Kenny]

Paul, check out the attached article. I found that one of my coils was down to 10 volts with the key on which will not fire the plugs. I wired a relay from the battery to the coils and it upped my voltage at the coils to 12volts. Old wiring can sometimes build up a resistance that will cut the voltage to the coils and effect spark at the plugs from weak spark to no spark.

I got this from member Distraction 628

http://www.wgcarbs.com/59021.html

[Paul F]

thanks for the article. I will consider this. I need to test the coils first. What is the easiest way to do this?

[salty_monk]

Simple to measure how many volts they are receiving or even wire temp direct from battery for a test.

Dan

[Thomas Kenny]

Paul, if one of your signal generator "Pickup coil" is not working it will effect two cylinders. The pickups generate a pulse to the Igniter unit as the crankshaft rotates past two pickups. The Igniter then fires the correct coil at the correct time. Generally there is a test procedure for these generators. On my 550 you do an ohmmeter reading on each of the legs and for instance on my bike you are looking for 250-500 ohms for a good pickup. Also check out flatoutmotorcycle.com and the Suzuki Parts Fische to see what a new unit would cost for your bike. You will find it listed under Signal Generator. I have bought 3 used ones from Ebay over the past years. Tom

[Thomas Kenny]

Paul,

The Signal Generators ( As Suzuki calls them) are located under the ignition cover on the right side. There are two pickups and each pick up is excited with the crank trigger passes by the pickup contact and sends a pulse to the igniter unit that then fires the correct coil and the correct time. So each pickup coil ultimately is responsible for firing two plugs through the igniter. I do not have a manual for the GS1100 series, but on my GS550 ES there is an ohm test for these coils. It requires that you place a test lead between the ground wire on the signal generator plug and another wire on the plug. On my bike the test is between ground Black/White wire in the plug and a Green/White wire in the plug and then a Brown wire. I then look for 250-500 ohms to be sure that both legs are working. Perhaps another on the forum with your GS1100EZ (1982) can give you the test info. I have bought 3 Signal Generators over the years from Ebay for my Suzuki GS550ES. Also check the Suzuki Parts Fisches and look under Signal Generator.

Tom

[Thomas Kenny]

Paul with the tank off and free access to your coils, using a volt meter just hook up your leads PtoP and NtoN turn on the key and read your voltage, it should be 12 volts. Its that simple. if you are down on voltage then consider installing a relay and wire direct to your coils from your battery. I just installed some new Dyna coils as my originals were giving up the ghost and needed to be replaced.
Tom