Re: Oil/gas mix - What is correct and does it very?
I think 16:1 is just too much oil and would recommend 20:1 for break in. After 4 or 5 tanks then go to 32 or 40:1. You want more oil in for break in until things, well get broken in. Then you can run less oil which allows you essentially more power due to more available fuel to combust. Due to the low compression of these engines a lower octain is preferred.
A 4 cycle has more parts to lubricate as well as many passages for the oil to travel requiring more oil. A 2 cycle uses oil in the fuel to continually add fresh oil throughout the intake, combustion and exhaust cycles.
Attached is a quick chart for oil mix ratios.