This engine is designed to run at 23-25,000 RPM. It will run slower than that, but you might have all sorts of trouble tuning it. It's not really a power plant for a sport application. Today these are mainly used in high speed models. it might be possible to run it as a sport engine. Check in this forum.

http://www.rcuniverse.com/forum/forumid_104/tt.htm

Greg