I've had 4 U Can Do's (3 46's and 1 60 ) and have used 4 strokes on all of them so I haven't tried one with a 2 stroke but it seems to me that the Evo 61 might be a little too small for the 60 Do. Just a guess. I'm sure it would fly it but you might not get the performance you'd like for 3D or aerobatics. My 46 Do's have all had Saito 82's and my 60 had a 125 Saito and those were just right for them. The reason the Do's are listed with such small engines is they don't want people to fly them too fast and rip them up in the air. That happened to a friends Do with an AX 55 in it. He wish ripping around through the air like a mad man and the poor Do just shredded.