The OH160 came with 2 different ignition systems. One is a conventional coil and points and the other is a self contained electronic ignition. They use different flywheels. The electronic system uses trigger pins on the rim of the flywheel. The electronic coils are scarce and expensive, usually around $200 or more. There have been a few homebrew replacement ignitions using a battery and hall effect transistor using the trigger pins for timing. If it works i would call it a win. You can google "HH120 ignition conversion" and see a few different conversions. No idea what is still available.