I second Cory Doctorow's Little Brother. You might also consider any of the Alex Benedict books by Jack McDevitt. Not written as YA, but good clean fun sort-of mysteries set in space and on other planets way in the future. If he likes fantasy, not just SF, then I would also recommend Throne of the Crescent Moon by Saladin Ahmed.
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You might also consider any of the Alex Benedict books by Jack McDevitt. Not written as YA, but good clean fun sort-of mysteries set in space and on other planets way in the future. If he likes fantasy, not just SF, then I would also recommend Throne of the Crescent Moon by Saladin Ahmed.