Can I use an Ignitech TCIP4 on a 3-cylinder two-stroke (e.g. Kawasaki KH) with a new pickup system?

Yes. You need a suitable pickup system: Ignitech can supply a pulse rotor (50 or 70 mm diameter) and IP6 inductive pickup, positioned 10° before TDC. The TCIP4 comes with a reduced basic harness, pre-programmed for your bike; the USB/COM cable is recommended. You can use the original ignition coils or Ignitech IC-TCI-S coils. The system works in wasted-spark mode only for the first few revolutions and then switches to fully sequential mode.