Pre Mix Chart & Calculator
One of the guys shared these on the Aprilia MX group, so I thought that they might be useful to someone on here as well???
Or this tool calculates the quantities based on the ratio you require;
Yeah, most use 2% as a rule of thumb
I saw a chart on the auto-pump back in the days, as I recall it pumped out 3-4% af WOT, and way less just idling or at low throttle operations. Kinda shows you the beaty of the auto-pump.
Some info here: http://www.dansmc.com/2_stroke_oilpump.htm