THe trouble wit h" testing with another one " is not that they have not done it ( as they should of course  ) but that they did not think about it !!!
Like Ted said, it is the kind of "mechanic" that remove all parts he thought MIGHT be wrong until it works .
A good one has a "global" idea of the machine ( i mean THIS very machine) and try to improve the running , comparing to this "ideal" one ( if ti sounds at Pirsig it does  ).
Maybe on a technical book somewhere ther is a way to test all this electic/electronic device . used to be for the old ' XT .
After reading all again, I presume that it might be an ignition matter : advance wrong sometimes or no ignition, not sure
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"In a car you're always in a compartment, and because you're used to it you don't realize that through that car window everything you see is just more TV." R. Pirsig
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