OS Fr7-420 questions
 

I'm looking at getting an OS Fr7-420 engine and have a a couple of questions:
1. The manual (page 18) says to connect a piece of tubing to the breather nipple, and the accmpanying diagram shows the drain plug installed in this tube. Should the breather/drain be open or closed for operation?
2. To match the engine to an airframe; what rpm should i expect with a 22x10 prop?

Thank you,
Tom