I used the new OS .55AX which is a killer engine (Coming from a 4-stroke junkie that's saying a LOT!)

The only bad thing about using the 55AX is that it is too small to fit in the pre-installed mount, but a 61 (or better yet, a 91 Surpass) would fit without having to rework the firewall.

Hey, sell your New Jersey Townhouse and move to the Midwest like I did. For what you could sell a Townhouse in Jersey for you could buy a 5 bedroom house with it's own flying field in the backyard out here