Well I can't thank all of you enough for the information on how to check the valves. Margaret has 21,000 miles on her and I figured it was time to get her 600 mile valve clearance check done.
Thanks to the information here I can say it was only going to be a 2.5 hour job--if I weren't an idiot! You see every one of the connections involved in the valve check goes wire to device--except one which the parts fiche labels as the Camshaft Pulser Assembly. That attaches from one wire to another. And lucky for me one half of the wire conveniently hides behind the rear cylinder and the other half drops under the coolant hoses if you drop them. Sigh, 2.5 hours turns into about 8 and I disassemble again, fit everything back together, rinse repeat. . . Funny once you plug them together the bike starts quite nicely.
For those keeping track: all of the valves were in spec. The .009 gauge wouldn't fit in any of them, and it was pretty consistent that the exhaust valves were at .008 and the intakes were at .006 so I didn't change a thing. I am VERY impressed with how clean the engine is inside--thank you Amsoil and Mobil 1. However I was disappointed with how gunky the intakes were. I only buy gas from two places and regularly run Lucas Oil injector cleaner about every 3 months. Injectors were pristine, but the tops of the intake valves have a ton of deposits on them. I am still getting 64 MPG indicated--60 calculated, but I have a feeling that if this keeps up it will require the heads to be removed and valves cleaned or the mileage will plummet. Plugs look great but it is time for the OEM air filter to go, so I'll do all of them next month when I change the oil.
Thanks again for all of the great tutorials, hints, videos and stories!