Vo Decker,
Regarding the prop, I would recommend you use an 8.8x8.75 or higher pitch for more speed or best result. I know Dub recommended the 8.8x8.5, but that prop is a little on the small size. Dub is usually very conservative when it come to recommending things on his engines for Sport fliers, but in actuality the BSE .50 can take much more than that. My BSE Quickie Jett, I wouldn't run anything smaller than a 8.8x8.75 even though it have a higher timing than the Sport Jett .50. However, you can start with the 8.8x8.5 for break-in for the first few flights before you move up to the bigger prop's. After that I wouldn't use anything less than 8.75 pitch. Also, make sure to keep the RPM's above 17,000+ with highest pitch prop's possible for this fully piped engine. Hope this help
Other recommendations...
McCoy #59 (hot plug, idle) or #9 (cold plug, high performance)
15% Power Master Fuel
APC Props 8.8x9, 8.8x9.25, 8.8x9.5
A smooth thumb and no weak knees
