Can I use an Ignitech unit on an engine it has never been tested on (e.g. racing moped with an aftermarket internal-rotor ignition)?

Possibly, but when Ignitech has never tested the unit with your pickup/ignition system, they cannot guarantee it will work. In that case a return would be handled with a restocking fee. We always check with the manufacturer first and tell you before shipping, so you can decide whether to try or cancel.