I got caned just recently on another forum for saying I dont use a timing light, BUT static time them to start with. I even tried advancing the timing while running, just use gloves or something so you dont get a boot off of the HT leads and dont get wrapped up in the fan or belts. Did the old "advance it till it wont rev any higher at idle and that will be sweet trick" for more power but kicked back on the starter like crazy so no good, did go better on propane with no ping but didn't try on petrol (gas). If it starts well when warm and doesnt ping you would be awfully close.