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Back when they still used the 2 hp Briggs, the folks at The University of Akron just built a custom head. I think it was OHV w/ pushrods & rocker arms.
Most teams would sleeve the cylinder to reduce displacement. Use/make a real low Rpm cam that's good for a lot of torue.
Weight, Weight, Weight. Pulse & Glide has always been a big part of that competition. Just make sure you gan get the engine to start when you need it to. Make sure your alignment is spot on.
Ceremic bearings in the wheels. Make sure when gliding that the only part of the drivetrain spinning is the rear wheel.
Don
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