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It could be actually possible to increase overall efficiency with a turbo, but it's easier to do so with direct injection since it allows leaner burn. Anyway, in an air-cooled engine which actually relies on richer mixtures to cool the pistons down, I would rather not to impose a higher thermal load. When it comes to motorcycles, even though I am aware of some that had been turbocharged, the space limitations on them makes it quite troublesome to fit a turbo on them.
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