Rob..
I now have 4 complete CDI boards with timer boards.. They all show the same problem. Battery voltage must be at least 5.3 volts and no higher that 5.6 or the units malfunction... Is this the voltage regulator chip (LP2950cz) causing this?
When I use my bench power supply set at 5.5 volts, everything works fine for hours. When I connect a charged ni-cad pack (4 cells) it will only work correctly for 3 minutes before voltage goes below minimum of 5.2 volts. Any ideas?

John