It just so happens that I have a Webra .61 in the box that I got from a neighbor..... . I assumed that the lower power 2-stroke would not be quite sufficient. I'm going to ask about this engine on another forum, but is this a "good" engine (I promise I'm not trying to start an arguement). Is it sufficeint for the four star 60. Ironically, a friend found an OS .40 FP in the woods while hunting, so I might have an engine for the *40 if it runs and the model "FP" (discontinued) is any good. I just got done rigging up an engine bench testing rig so that I can try to start both of them. Any thoughts on either engine? Thank you for all ideas and thoughts up 'til now.