desertrat, I'm still in the assembly stage on this plane. I've had a hard time finding all the small hardware to put my plane together, I never can find all the right size bolts and nuts for engine mounts and such. But i do have the gas engine mounted and it did fit the original 120 size motor mount that came with the plane. My only goal in putting this large engine on this plane was to save on the cost of fuel. The person I bought the engine from used it on a 14lbs cap 232 72 inch,and said it could hover the plane but did not have complete unlimited vertical climb out, So i figure even if my U CAN DO weighs in at say 9 lbs, with the 1.4 engine it will be putting out 17 lbs of thrust using the recommended 17x8 prop. this i hope will give it the thrust to hover at low RPMs. I'm not sure how this will turn out in real life i do have a 91 four stroke that i could use but my real goal was to cheep-en my fuel cost. when i get it going ill be sure to post about it . there is one more hold up i forgot to mention, the wing i got was covered backward the checker board patter was on top and the red white and blue colors was on the bottom so I'm been waiting for Great planes to send my the replacement wing and it not here on Friday as they promised.