Just an update to an old thread.
The last 4 months I`ve flown the heck out of the 4 * .Easily putting on a 100 flights a month and a few bumps and bruises along the way. Last weekend the rudder hinges gave way while making a landing approach , the only thing holding it on was the control horn.
landed a little ruff and the 4* 40 is now retired. lol

I bought and ARF SSE a month ago and am to the point of installing a engine . I`m going to start out with the Saito .56 that was on my 4* . After it has been broke in, it pulled the 4* good and the planes weigh about the same. Or I do have a OS 46ax or a GMS.47 I can install on it. After doing some research , it seems most have 2 stroke on them .

I miss the 4* so much already , I ordred a 4* .60 kit , which well make a good home for the ST G.90 I have. Or a ST .61 , the .90 is the same wieght as the .61 and hope the extra power does`nt hurt anything.