DISCLAIMER: I am no mechanic.
Took the my '87 1000F which I have owned since '89 with 55k miles out for the first time this year. It started, ran fine for a five mile ride. Put the bike away and two days later it won't start. Appears to be no spark. Following the shop manual , it would appear a coil problem or pulse generator. Can both coils fail at the same time? I have 12v at the Bl/Wh wire at both coils. Pulse generator however is showing continuity on only one side. Ordered a used pulse generator and it too had continuity only on one side. Ironically it was the opposite side of my original. Shop manual says there should be continuity on both sides. Suggestion or thoughts?

 

When my pulse generator went bad, the ignition would not advance. Stayed at TDC the whole time. When I did the resistance test, it passed. When I checked the ignition timing, that's when I knew it was bad. So I wouldn't trust the resistance test on the spark generator. Did you try the new spark generator or just test the resistance of it?

 

I give up. It's going to the dealer this week.

 

Maybe I have misunderstood the function of the pulse generator, but I don't think it has anything to do with timing advance adjustment at all. I havent looked into it, but there is no check or maintenance for an mechanical advance mechanism so I assume it is fixed and gives a pulse 38 deeg or so before TDC. If the pulse generator is mechanically fixed, it only delivers trigg pulses to the ECU, which handles the advance adjustment relative rpm and also amplifies the voltage and current to the coils. The ECU delays the trigg pulse at low rpm, to about 12 deeg advance at idle and then decrease the delay so that the timing advance is full at some higher rpm.

The chance for two independent coils to fail at the same time is extremly remote and is almost for sure not the cause.

 

could be bad computer even if it is getting + and -