RE: When to lean out
lol what SS is trying to say is.. you should tune your engine properly from the get go. You don't run.. er you are not suppose to run gas engines rich like a glow engine. Tune them properly from day one and leave it alone. More often then not engine companies recommend 32:1 or something for the first few gallons and then a higher ratio later... even this is sometimes questionable. Regardless of oil content you still tune it the same way from the get go.
Do a search of tuning and tune it properly and have fun.