Does your FS36 have a light colored tan backplate with a reed valve (Carburator attaches to) and a long propeller shaft. If so, it is indeed a RYOBI built unit. The tan back plate offers some advantages. The carburator is a quarter turn from the regular BLACK back plate, and a little longer. All parts are interchangeable such as black back plates ect. Good luck. Any questions, I am glad to share my experiences... FLATHEAD