A bigger bore is generally the best way to get more power. It creates more space, allowing for bigger valve openings, which in turn can bring more fuel and air into the cylinder. This doesn't work well at low rpm but does at high rpm. That plays well in to the other factor. A bigger bore with a shorter stroke also allows an engine to rev higher, which creates more horsepower.
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Conversely, a long stroke is generally better for fuel efficiency, because it reduces surface area during combustion. With less surface area, there is less room for heat to escape, ensuring more of the energy from combustion is turned into useful work to push down the piston.
A small-bore, long-stroke engine also requires the flame to travel less distance during combustion, which means the burn duration is shorter. That allows combustion to do once again do more work and make the engine more efficient.
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