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Paul's post just above yours explains it.

You know, I tend to agree somewhat. I have found that disassembly can sometimes disturb the patina that is, in some cases, keeping things sealed. Still, all those rubber bits are getting really old....

The Eliases. Most of them have moved; the closest is in Denver.

Visiting a few years ago for his funeral was an unexpected adventure. His daughters, apparently, had lived at one time or another in...

I seem to remember that a couple of the relays in there are interchangeable. I just don't remember which. :(

It's the weep hole for the oil/water pump. Time for new seals. Or find a good K1200 pump on eBay and bolt it on.

Trinidad CO - beautiful country there! My stepdad's family came from Trinidad.

Hmm, come to think of it ... my intermittent issue started only some time after my original sender failed completely (no pump operation at all), and I replaced it with a used one. Hmm, indeed. This...

You're quite right that a working start button eliminates the kill switch as the fault. The dash light behavior apparently changed sometime between 1987 and 1991.

The fuel sender is quite possibly...

The HES connects to the ignition box, not the fuel tank connector. No HES wiring passes through the connector.

The four wires in the fuel tank connector include two fuel-level wires, one of which...

On my '87 K75C they're on whenever the ignition is on.

And, speaking of things that are simple - how's the main battery ground? Is it a good, thick cable, or the piddly little 10awg (or thereabouts) original one? Good clean connection on the transmission?

OK, let's take another look at some of the basics. We have an interruption of fuel and spark. We may have an association with the tank coming off and/or being unplugged. We think the HES is fine, and...

I replaced the fuel tank plug with a Delphi Weatherpack connector the first time I "fixed" my issue, and until it recurred I believed that connector was the most likely item to have solved it. And...

What?! Don't they know they could sell it for $9,000?

That conductive paste does sound interesting, then, especially given the common failures of ground points on these bikes. Does it have a name, and is it widely available?

I asked because it often...

You likely have something else going on, but this may help as well - consider changing the oil to something lighter, and when you start the bike, sit on it and hold the clutch in.

Two winters ago...

The fuel injection relay's coil appears to be grounded through pin 7 of the ignition unit. So, it seems plausible that a fault with the relay or that leg of the wiring could cause the loss of both...

How do you know you have spark?

I'm not saying you don't - I just don't see where that was established.

There's a local one here with 5,347 miles advertised for $4500. "Needs work," though it certainly looks nice.

http://orangecounty.craigslist.org/mcy/3777420389.html

Can the factory shock be "topped off"? I thought they were sealed and utterly maintenance-impossible.

A ... what?

So you're saying he should fill it with orange juice and put it in the dryer?

Yes, I've had one of these fail previously, though in that case it just wouldn't work at all - nothing intermittent about it. Been hoping it isn't that again as, apart from a Hall effect sensor,...

Thanks - I've replaced the connector with a new Delphi Weather Pack connector. That doesn't, of course, rule out a problem with the connection through the sending unit itself, which is also a weak...

Thanks. It passes the wiggle test, but I have enough "missing voltage" here and there on the bike that cleaning the ignition is high on the list.

Question on that process (and yes, I've read the...

Oh, and there's also no throttle position switch on the bike. Removed it last time and haven't put it back on. (Which doesn't rule out a problem on its connecting wire, of course.) But the switch...