Hi miamiflyer,

I think you will find there are a number of Contender flyers out there.

The motor is easy to change as it mounts upright and open from above. When you first mount it make a hole right through the basla block under the motor with a piece of wire pushed through the motor mount(sharpened push rod?). Then use a drill bit slightly larger than the socket that suits the nyloc nuts on the mounting bolts. You can then use the socket to tighten or remove the nuts and recover the tiny openings with a bit of scrap covering (almost impossible to see and it's on the ventral surface anyway). With the four stroke I didn't have to even remove the muffler to get at the bolt heads.

If you then change motors simply drill the new holes in the motor mount and repeat the process. I was lucky with the Saito 72 as the fron two holes aligned perfectly.