Things have been moving along reasonably well, even got it started. BUT I have hit a real (for me) brain teaser. As you can see from the photos I am trying to sort out the wiring. That would be complicated enough if I didn't have another issue that is not directly related to the wiring but must somehow be connected. First, I have not cut or removed or otherwise harmed any of the original harness beyond removing some of the tape. I planned to get it running and gradually wire in all the stuff that is staying, then, one wire, one connector at a time begin removing the stuff I don't need.
Unfortunately I have encountered an erratic issue with the ignition system that includes the fuel pump function. I won't go into details about trouble shooting but I have spent hours trying to isolate the problem. Fuel pump works, fuel pump relay is good, but sometimes I have spark and sometimes I don't! (which means the fuel pump shuts down as well, confusing the issue). I was inclined to believe the ignition control unit (black box, computer) was at fault. I have a spare from another engine which when substituted during a period of "no spark" also produced no spark. Probably bad too. But this morning after sitting all night I fired it up without difficulty (original ICU) and let it run for a few minutes when it just quit. Sure enough, no spark. Switched to second ICU, same story. Went to lunch.
After lunch, tried it again, started up! I shut it off and quickly switched to the second ICU, then fired it back up. So I think it does not seem to be an ICU problem.
If it were a bad coil it would be two cylinders only.
If it were caused by the pulse generator on the front of the engine, wouldn't one coil continue to fire?
the problem seems (maybe) heat related, engine runs a bit then shuts off, sets long enough to cool down then fires up. Doesn't seem like a bad wire or connection (have checked pretty carefully) but could be overlooking something.
Is there any common denominator to the entire ignition system?
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Bikes at present:
80 GL1100 Interstate: Now a Cafe Racer called DRAGON WING.
81 GL1100 collecting dust with about 300,000 miles, known as BLACK BEAUTY
2008 (I think) GL1800 Nice bike but as exciting as the family sedan!
76 GL1100 yes, 1100 with 1000 heads and cams, being customized
A fleet of parts bikes awaiting resuscitation or customization or abandonment