I cannot wait to fire up my nice new YS FZ110s!!! You guys are getting me awfully excited; just over two months and it will be time Fortunately or unfortunately I've been concentrating much more on school this semester and haven't really touched a plane since January; still have a little work to do to all 3 planes before they are flight ready, but that's what Spring Break is for!

To tie it to the thread, I've got one season of flying RC - all two strokes. I took the plunge for a 4 stroke, and I think the OP should, too!

Now I don't have any first hand experience tuning a four stroke (other than holding a plane and blasting my instructor with questions while he tuned his), so I plan on bringing along my tachometer, leaning out in small increments, and listening by ear and watching my tach for the first sign of a drop in RPM. Maybe I'll hear it, maybe I won't...
I remember the excitement of starting my first RC plane engine last summer. I was extremely excited and nervous and didn't really know what I was listening for. Even with a bunch of hours flying, I still think I'll feel the same with the YS, and having the tach is at the very least an extra safeguard against nasty lean conditions.