Ignition Timing - Unleaded head

[Peatminor]

I have recently fitted an unleaded head to my 1098cc. Can anyone tell me the optimum timing using standard unleaded? Thank so much.

[philthehill]

There is no standard timing for unleaded Minor engines.
Start with the standard workshop static setting and adjust (advance or retard) as necessary after/during road testing.
No two engines are the same so each engine will require its own timing setting.

[Peatminor]

I wondered if it might be a bit of trial and error. Thanks for the helpful response