I have Pirhana ignition on my 500K1 for the last 12 years. It was fitted to my Guzzi in the 80s and I adapted it for the even firing 4. I didn’t think there was a way of statically setting it accurately. I notice that at tickover is a little advanced, but I set it at 3500-4000 rpm, but it still relies on the old mechanical advance mechanism.
On the Kettle site I notice that Newtronic advised to file the slots in the plate longer.