Motorcycle Repair: Engine dies, stator assembly, pulse generators

Question
I own a 1986 Honda Shadow VT-700.  After running for about
an hour the engine dies with no spark to both plugs on front
cylinder.  After an hour or so, the engine will start... but again
dies.  I checked resistance on pulse generators and they were
within spec.  So, I figured the coil was failing when hot.  I
replaced the coil.  Same thing happened, it started... it failed... no
spark at front cylinder.   Immediately after the failure I checked
resistance of pulse generators.  Front generator, as
measured at connector next to spark unit, measured zero ohms.   
Rear generator at specs.  After about an hour front measured within
spec and bike would
start.   
Questions:  Can pulse generator fail with temperature?   Do they
need to be replaced or is it possible that gap is wrong?  To
replace, do I need to disassemble entire clutch or can I just
remove the clutch outer housing?
This has been driving me crazy... hope you can help.
Thanks
Paul

Answer
Paul, any electronic component will change values with heat, whether from external or internal sources. It seems apparent that the engine heat is affecting the pulse generator coil.

The pulser coils are part of the stator assembly, if Honda's normal manufacturing process was being followed. Big $$$, unfortunately. You might check www.electrexusa.com for some assistance. You should only have to drain the oil and pull the stator side cover to remove the pulser coils and the stator winding assembly. I never worked on one of these, so am guesstimating to a certain degree.

Bill Silver