I should go talk to them, it's not far from where I live. 2.5 hp in a 4 lb package is incredible power density, and rotary engines are more reliable than high revving piston engines by a long shot due to less cyclic stress reversals. The 13b engines are a favorite in formula car racing because they last 5 times longer than a high strung four banger under hard use.
Check this out:
Putting this engine on a kart gives it F1-level acceleration, some reviews I read left the test drivers speechless. I can't imagine how fun one of those would be on a super pocket bike or a bobber!