Originally Posted by
FlyerInOKC
Thank you for the numbers! The first thing I want to do is measure the engine and determine what size it actually is. The prop shaft thread size should be a good indicator to start with. Capt I sent you a PM this morning.
Prop shaft 8mm, Bore 31.7mm, Stroke 24mm, Displacement 18.94cc. "FA-115" will be cast into the muffler tail piece if its the original. If it's anything but an FA-115 I'd be very surprised. Even though they are still available new for big bucks it's pretty rare to find a good used one, especially at that price. Best of luck to you Mike.