i have been working on this el for a while replacing parts with no avail.
it has a spark problem
replaced spark leads, cap, rotor, new coil, ect.
(coil has spark)

come down to the tfi plug (loom)
have power at TACH IDM (coil negative) and no power on TFI POWER RUN (Run Power IN)

whats before TFI POWER RUN?

If TFI Power Run is Spark out and you have no power there with the ignition on the TFI module is faulty replace TFI module.