I own a K&B 6.5 front rotor ABC engine with rear exhaust. The engine number is 9130. It is for aircraft but looks a bit like some of the 7.5 marine versions or the ducted fan eninge.
I can not find my engine listed in your section on manuals or parts. What parts list would be most appropriate for bearings etc?
I have used both the stock muffler and a tuned pipe. The stock muffler works quite well for pressure. I find the tuned exhaust to be very touchy.
Are the stock mufflers still available?
Mike