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I would vote for a WR 250 Yamaha engine, electric start, supposed to be very reliable, with high compression. It could be detuned some with different grind on the cams, but if running a Carb, leaving the Intake open late does not seem like a good idea, as you'd be pushing air-fuel mix back out of the carb. With enough computers the Prius can do it by adjusting the fuel injection.
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