Previous Owner Mod - Tracking Down Weak Spark

[jswhite]

Hey All,
I?m reaching out for your expertise on wiring. The previous owner made some mods which I believe to be the source of the problem on my 81? GS650G.
So I?m trouble shooting a weak spark. I just completed athe coil mod, and have a tiny blue spark, but it is super weak.
I?ll try to explain what is happening as best I can- I'm using the Clymer & FSM.
Looks like the previous owner replaced the starter solenoid, and also put new wires running down to where the ignition cover is, bypassing the ignitor/signal generator all together...

1. The blue and green wires coming from the ignitor going to the signal generator, are not plugged into anything, hanging loose.
2. The White, orange/white, black/white, black/yellow wires from the ignitor are not plugged into anything.
3. Wires running, down to where the ignition cover is, pick up on the other side of where the wires in above, bullet point # 2, would be plugged in. Thinking these are for the new ignitor/signal generator which fits down in the igniton cover? Havent ripped it apart down below to see whats going on yet, I will, if its necessary
4. The new starter solenoid has a yellow/green wire going into the harness with a green/yellow wire hanging loose right next to it. This makes me think the oil pressure gauge switch isn?t connected to anything - most likely minor in terms of getting a strong snappy spark.

When I bought this bike, it ran (very hard to cold start), and it still cranks as it should. Have a feeling there are multiple issues here.
Tried to get all the names correct on different items but could have still messed them, thanks for the help!

 

[jswhite]

loose oil pressure wire

 

[jswhite]

Signal generator non existent, part of problem? or irrelevant with new wiring?

 

[jswhite]

Wires from ignitor not plugged in.

 

[jswhite]

So after typing about it, I got myself curious. What happening down below. I fund a Dyna S Ignition. So this shouldn't take the place of the ignitor/signal generator would it? Nor should it have any change on the spark, right?

 

[Steve]

Yes, the Dyna replaces the signal generator(s) and the ignitor.

You should have a wire running from a switched source (probably the red wire in your first picture) that goes to the Dyna unit on the right end of the crank. The orange/white wire (where the red wire is attached) should go to each coil. There should also be a wire from each coil that comes down to the Dyna unit. Not sure if there is a separate ground wire at the Dyna or if it simply grounds by mounting it. Your stock ignitor and signal generator(s) can be removed from the bike.

.

 

[hillsy]

What coils are on the bike?

 

[jswhite]

What coils are on the bike?

Stock coils


Checked the spark one more time, it is blue, but doesn't make a strong pop. I know orange/yellow spark is bad, should this spark then be OK?
All of this is troubleshooting a cold start issue, no I havent checked the valves, and I believe that would be next on the list...

 

[jswhite]

Yes, the Dyna replaces the signal generator(s) and the ignitor.

You should have a wire running from a switched source (probably the red wire in your first picture) that goes to the Dyna unit on the right end of the crank. The orange/white wire (where the red wire is attached) should go to each coil. There should also be a wire from each coil that comes down to the Dyna unit. Not sure if there is a separate ground wire at the Dyna or if it simply grounds by mounting it. Your stock ignitor and signal generator(s) can be removed from the bike.

.

Steve coming thru once again, thank you. Good to know the previous owner didnt discard any necessary elements in that department.