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Since all three had a fat blue spark you're OK on the coils. The symptom of a bad coil is a random misfire on one cylinder that disappears when the alternator takes over for the battery. The failure mode of the coils is that the secondary windings short together and reduce the output voltage.
Since you've said your idle was smooth I didn't really think the coils were the problem.
The reason it takes a second or two before you get a spark is that the ignition plate on the crank has 7 teeth so it takes a full revolution for the igniter to find the #1 tooth. Then it just keeps count.
I'm still disturbed by the 'cuts out like a switch was thrown' thing. Bad coils don't account for that and an intermittant in the ignition circuit would show up as a random misfire at higher rpms. You wouldn't fail to notice if the ignition quit briefly at higher revs since the crank would have to do it's full revolution thing before the igniter got oriented and started firing again.
For a thinwall socket, buy cheap! The cheaper it is, the thinner the sidewall generally is. The 6-point sockets also seem to have thinner sidewalls than the 12-point ones.
I'm still thinking about this... I wish I could get my hands on the bike for a few minutes to get the feel of it.
Jim
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