That should be a 150 Watt continuous or so motor, I'd think a good prop for it would be the Great Planes PowerFlow slow fly props
in 8 x 6 or 9 x 4.5. I'd mount that on the tapered cone style prop saver prop adapter
if it can be used on your plane.
The GP slow fly props are not easy to find a a LHS, I find them on eBay though and at good prices. More info here on fitting the prop saver and also on the Thera-Band prop saver bands:
Similar sized GWS slow fly props would be OK too but they will not handle the power or RPM anywhere near as well as the Great Planes props do.