I have had 2 4*60'S and have flown them with several different engines. The first one had a Thunder Tiger Pro 61 on it and it flew OK it was good for sport flying but it didn't have much for vertical performance. I switched this engine out for a GMS 76. The GMS gave the plane unlimited vertical and was a very good running engine right out of the box. At 79.99 it was a great deal. I haven't been able to find anymore of these for sale lately. The second one had a magnum 91 4 stroke on it and it was a great flier. I flew this many times and loved it. I switched this out for a Thunder tiger 91 4 stroke and wow what a difference. This engine has more power than the magnum and it would pull the plane straight up out of sight. This was the best engine that I tried on the 4*. I think that the Super Tigre 90 would be a great engine on this plane also. I have had a couole of them but did not try them on the 4*. I am picking one up this week and at 119.00 from tower they are the best engine deal going.

Rick