i dont actually have the engine yet, my brother in law has it and it is still on the trimmer.. it is a bushwacker trimmer, it has a circle saw blade on it, but it is in weedeater form.. i am traveling to visit my brother in law and sister on saturday so i will have pics and more info then, but i am pretty certain that the engine runs clockwise, so i dont think i can use it, i will probably have to use the 25cc husqvarna trimmer engine.