Subaru EH72D Instructions For Use Manual page 31

HIGH ALTITUDE ENGINE OPERATION
Please have an authorized Robin America service dealer modify this engine
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if it is to be run continuously above 5,000 feet (1,500 meters). Failure to do so,
may result in poor engine performance, spark plug fouling, hard starting, and
increased emissions.
Carburetor modification by an authorized Robin America service dealer will
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improve performance and allow that this engine meets EPA (Environmental
Protection Agency) and California ARB (Air Resources Board) emission
standards throughout its useful life.
An engine converted for high altitudes can not be run at 5,000 feet or lower.
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In doing so, the engine will overheat and cause serious engine damage.
Please have an authorized Robin America service dealer restore high altitude
modified engines to the original factory specification before operating below
5,000 feet.
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