Thanks guys.
So what are the disadvantages of less than 20 degree. Let say 10 degree BTDC?
Also since this will be my first gas engine, what should be the starting procedure as far as how much gas I need in the carb before starting it?

The carb I'm using has a pump but no chuck or primer bulb, so I have to prime it with my finger on the hole. When priming it do I need the throttle opened or should be closed?

Thanks
Borna