I plan to change the carb to an aircraft version, or make a manifold. But a horizontal or inverted installation would allow the supplied manifold. This is a "just to be different" project. A four stroke speed plane. The modified engines have been dynoed at over .6HP at 20kRPM. As shipped, the engine has no crankcase breather. I don't know how they get away with that. I can use the stock crank with a special prop nut. The small prop is a must to allow that RPM. I thought the thread I'm looking for said an 8x6 at 16-18kRPM, stock.

This engine has a different cam and heavy valve springs to prevent float. It takes some effort to turn over, without a plug in it.