The 120 4 stroke should have been enough for that plane??? That plane is designed for a .61 - .91 2 stroke so the 4 stroke should work ok. What cheap 4 stroke was it? Compare the weight of your 4 stroke to the new 120AX 2 stroke and see where your at as far as your CG.
ORIGINAL: OverTheEdge
Let me expand alittle... I've had this plane for about 3 yrs with a cheap 120four stroke on it... cg is not a problem... the engine on the plane now is not of high performance and I used it to get familiar with the plane... and it was cheap at the time. Now that I'm comfortable with the plane I want to add some ponies up front.