Quote from: km4unq on February 20, 2017, 09:57:28 AM
Spark is lost on BOTH cylinders, i can pull both ground to block and get zero spark on either. Until bike is cooled off. I'm now also thinking its that signal generator, I'm also at work so I'll have to fiddle with it when I get home. Will update

When its dead, spray the thing on the right side of the crank with a can of compressed air and see if it starts working again.
BTW pretty soon it will be completely dead and this trick will not give you "proof" that its the issue.
Cool.
Buddha.

Today I was able to confirm that while running, the connectors on the signal generator have varying resistance as the bike runs, and then when it "dies" (no spark) the thing has no resistance at all. Do you want me to blow air on that part? What exactly does that do? I have an air compressor so I can do it no big deal I'm just not sure what Im looking for.

I know you're already thinking along these lines, but it sounds like it has to be something that is losing contact, or shorting, as components expand from the heat of running.  Do you see a way that could be happening to the coils, where they are good cold, but bad hot?  and 1989 is the year, if someone hasn't shared yet, it was hard to find my first time too

Weren't several people having trouble with the signal generator when a little heat is added?  That whole area appears to have been exposed to quite a bit of moisture.  I'd be willing to bet that it's a connection in that area.  I think people might have been fixing it by just replacing the signal generator.  It would be worth doing a little bit of forum searching for signal generator.

Here is the post I was looking for: http://gstwins.com/gsboard/index.php?topic=69514.msg835807

I have a signal generator on order from bike bandit, will be here in a few days. Will update what happens.

The new signal generator did the trick! She runs like a sewing machine now! Thanks to all for the help and advice. One thing to note for future readers of this, the only difference that I could measure between the old signal generator and the new one, is that the new one is extremely magnetic, stuck to everything, the old one was not at all. Hope that helps. 

Glad to hear you got her running! Enjoy! 

Happy to hear you were able to resolve your issue!

Maybe you had the wrong year reluctor pickup in it.Or maybe, considering the rust there was enough corrosion between the pickup plate and the motor to lose earth.
The rust on the reluctor itself will have zero effect as it is the effect of the metal passing the magnetic pickup pole that generates the signal.
Losing magnetism seems strange as usually that requires the magnet to be raise about it's curie temp which I think would have been a bit difficult. Possible though ( stored near a strong alternating magnetic field?).
Glad you got it working though.