RE: A good .61 engine
Don't discount the Thunder Tiger GP 61 either. I've got one I picked up off EBay for $57 (USD). It turns a 13x4 APC prop at 12,600 rpm. Its easy to start, easy to tune, and has proven to be very hardy (survived some major crashes). I'm willing to bet you can pick them up pretty inexpensively in Malaysia.
Brad