RE: engine rpm
The engine does run strong and has been modified, carb. is a Walbro WA 40 A two needle and was opened to 11mm, Bennett mufler, the flywheel has been turned down with all the fins removed, a paper gasket between the cyl. and crankcase to increase C/R, the intake and ex. ports have been reworked and has Bowman rings, so I guess you could say it has been modified a little. The airplane is a large sport Aerobatic 81" wingspan, 13.5 lbs. mid wing scratch built. A real little ***** cat when it comes to flying.
Gryohead