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The engine's a tank because it's ridiculously detuned from what a NA 4 stroke of that displacement and cylinder surface area to volume ratio can produce. A CRF250R makes 40 hp out of .25l on pump gas. It's true, the surface area to volume on that motor is better but you can extrapolate. The biggest problem is lack of dry sump, but that may not show up for a long time without slicks.
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