Dear Rob,

I expecting your help to build the ignition advance timing curve for 4 strokes engine 100cc. Position of pickup sensor is 36o. Engine spark at 15o at low RPM and 27o at max RPM.
max RPM with full load is arround 8000 RPM and 12000RPM at no load.
I looked through the excel file which you showed to make timing curve but i don't know why you set POP (point of pickup) BTDC is 40 ?

Can you help.

Tung.