I coming of a top end rebuild. It's not science, but it's what I've read around here.
First 5 gallons was 50:1 premix with oil injection.
Second 10 gallons was at 100:1 premix with oil injection.
Third 5 gallons is at 200:1 premix with oil injection. << I'm here right now.
Forth 5 gallons with 10oz of Seafoam to clean up.
Fifth 5 gallons with 5 oz of Seafoam to clean up.
Install new plugs.
So far, pretty smokey upon start up. When it's warmed up, not as smokey. Plugs look a little brown but hey, it's expected. Starts on third pull on cold startup (dead starter so I have to pull).
No WOT's yet. Up and down on the throttle up to 7500 RPM and back off. WOT's coming soon.