I don't have instructions for it. My Dad got the engine as a gift as he wanted to get into RC planes but never did. I'm kind of doing this blind.

It's a K&B .40 engine. I'll either get a model numbe off of it or take a picture.

So a 4 cycle run is just running it super rich? Did I understand that correctly? and a 2 cycle run is running it more lean?

How do you determine what RPM you are running at?

Thanks for the information about how to break in the engine properly. I greatly appreciate it.