No spark on cylinder 2 & 3

[Guest]

Hello,

I have a 81 GS650G that i just recently got running it needed carb work, now that it is running I have noticed that I have no spark on cylinder 2&3. I have OHM tested the coils, reading was (3.7-3.9) and they are good according to the repair manual. I even swapped the coils to make sure, still same result no fire on 2&3. Also I OHM tested the signal generator and got a reading of 357 OHM'S which should be good. So this all leads me to beileve that my igniter may have gone bad, which might have been caused from my weak stator. Does this seem logical? I am new to motorcycles (first bike) I would really appreciate any feed back.

Thanks

Nick

[Nessism]

Bad stator won't cause no spark, unless the battery is dead.

[rwnielsen]

I lost a coil last week riding up a mountain road. I slid the tank back and one of the wires had come loose from the push on connections (primary side). Probably knocked it loose when I was rejetting and kept removing the tank. On my bike that connection is basically in the weather, facing forward, under the tank.

[koolaid_kid]

Coil swap - no change = not the coil
Signal generator tests O.K. (assuming your values are in the ballpark) = not the signal generator.
All you have left is the wiring from the signal generator to the igniter, the wiring from the igniter to the coil, and the igniter itself.
Follow the yellow brick road.

Low voltage will not damage an igniter. Old age will.

[nbrown]

My repair manual said my values for the signal generator should be 240-360. I am going to check the wiring tomorrow and if that checks out im going to test the igniter. If my igniter is bad i was considering purchasing a Dyna S ignition, Does anyone here have any experience with these? I am hoping to get her on the road in the next few weeks. I will keep you all updated after I try my hand at some more diagnostics tomorrow.

Coil swap - no change = not the coil
Signal generator tests O.K. (assuming your values are in the ballpark) = not the signal generator.
All you have left is the wiring from the signal generator to the igniter, the wiring from the igniter to the coil, and the igniter itself.
Follow the yellow brick road.

Low voltage will not damage an igniter. Old age will.

[koolaid_kid]

Yes. An excellent upgrade to the stock ignition. You will no longer need your igniter, either.

[tom203]

Yes,double check all connections from signal generator to ignitor and there to coils.With ignition "on" ,check voltage on orange/white wire going to coils- I'm guessing you need 11 volts minimum (less during cranking is ok)

[nbrown]

I did check my voltage at the coils yesterday I had 11.5 volts. I am really hoping its a bad wire somewhere, well my wallet is hoping anyways.

[tom203]

Clean the plug that feeds ignitor and the plug that connects signal generator to ignitor (both under seat ).

[koolaid_kid]

DeOxit is an excellent cleaner/lubricant for all electrical connections. A must have for all GS mechanics.