How's the flying there? I was thinking of buying a 90hp J3 Cub...is that practical?
I flew once in a J3 cub...some of the most fun I've ever had in the air. Even got a pin for doing the second most spins that particular J3 instructor had ever had a student do (and ya, it was on purpose).
But for most uses, a J3 cub is about as practical as a Model T Ford. Cool, fun, classy, and a complete pain in the ass to do anything with other than fly slowly around the block on Sunday afternoon when the weather is perfect.
I'm pretty sure you want to buy my Cessna 140. Seriously though, I think you'll have a lot of difficulty getting a private license in a J3. I haven't seen many J3's that you can do the night flying, or the simulated instrument flying in...both required for your license. I'm not saying it's right, but I really don't see how you can get a license in an aircraft that doesn't have an electrical system, radios, position lights, etc..
Again, I think J3 Cubs are just cool as hell, but if you're looking to buy an airplane in which you can both get your license in AND be able to do more than fly a 100 mile radius from your home field, I've got a much better plane for you. (And yes, I'm trying to sell a plane...a great plane.) But even if I wasn't, I'd still advise you to look long and hard before buying a J3 to get your license in. There's no point at all in buying a plane you can't get your license in...own a plane AND rent a plane? Do one or the other...not both.