Thanks for the reply. I was pretty sure that's what it was. I see you have a four stroker on yours. What make and size is it? This one came with a K&B 40 2 stroke (new). I had one on my first trainer over a decade ago. It was the worst engine I have ever had. I was thinking about trying it but I also have an Enya 52 four stroke that runs good. I may just play around with the existing engine since it is new to see how it runs. But I will yank it out in a heart beat if it gives me any trouble.

How does yours fly. Any good or bad habits?