Sorry to all those who replied and noted that I forgot to say it was an 84
Westy.  Again, it just flat out quit.  Had fuel at injectors, spark at the
plugs, and no obvious disconnects (wires, vacuum, etc.).  What it does have
is a dead ECU.  Everything works, but there is no brain to control it!  This
was discovered by subbing in a functioning used unit. Whoopee, it started
right up.

John Moore
Tucson, AZ
84 Westy that ought to live forever now