Seems like too much work and non optimized parts to convert a motorcycle gas engine to diesel for this event where Engine off Coasting, which alleviates much of the loss of efficiency of a throttled gas engine, is entirely feasible. I would probably start with a Honda 49cc injected engine out of a Ruckus or Metro as Honda is the champ of FE right now. Retune the mixture with a piggyback fuel controller, Retune the intake pulse for your desired rpm range, use hot air intake to save heat energy and use a high tech coolant to boost engine temps to 200C? with minimal vaining on the water pump.
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