My bike runs badly with the new Ignitech unit but fine with the old ignition. Why?

A programmable unit must be programmed for your specific bike: the pickup configuration (e.g. one or two pulse generators), the advance curve and the coil settings must match your engine. Check the configuration loaded in the unit, and send us a photo of the connections, the configuration file and a photo of the letters engraved on the Ignitech housing (they identify the hardware variant) so we can check it with the manufacturer.