Your Extra looks like a Seagull Model. I have one just like it and it's a great flyer with a 60 size 2-stroke or a 91 4-stroke. I have a YS 91 AC on mine and it was my favorite until I stripped the threads on the crankshaft. If you've been out of the hobby for a while, getting your thumbs back in shape on a trainer is a good idea before tackling this bird. It's very responsive. That translates to "you can get in trouble very quickly"[:-]. Welcome back to the hobby!