Just a bit more perspective on the Jett. First there aren't a whole lot of choices for rear exhaust 2-stroke engines (any size) anymore. Webra makes an 80 (as well as the 145 and 160), but the price here is a bit over $400US. The AXE Rossi 61 5 port is $325. Both are very well made engines. You can wait for a Hanno Special or YS AR to appear on eBay, but used ones are always a bit 'iffy' and new ones - especially Hannos, can easily get bid up to the $400 range. The Jet is basically a hand made engine custom made for you once you order/pay for the engine. It is test run at the factory and the engines are extremely well made! I have one and they are a beautiful piece of machinery. I have not flown mine yet, but will eventually. There was a very nice Curare which appeared here, powered with a Jett engine (I can't remember which one, but I think it was a 90 side exhaust). The owner loved it. Sadly it had a very short life span. I believe Dubb Jett will work pretty hard to repair an engine as well; unless it is truly destroyed.
Just my 2 cents...
-Will