Hyundai HG4500I Original Instructions Manual page 21

Gasoline inverter generator
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This engine may require a high altitude carburetor kit to ensure correct
engine operation at altitudes above 1000 meters. The performance of a
gasoline engine can be improved by replacing a slightly smaller main
nozzle on the carburetor or by adjusting the adjustment screw. If you
often use generators in areas over 1000 meters, you can buy special
high-altitude components for replacement. Otherwise , reduce load
power when using generator。
Even with a suitable carburetor, the power of the gasoline engine will
decrease by about 3.5% for every 300 meters above sea level. If the
carburetor is not replaced properly, the decline will be even greater.
If carburetors suitable for use at high altitudes are equipped with
gasoline engines at low altitudes, excessive lean mixture will reduce the
output power of gasoline engines, cause overheating and even cause
serious damage.
21

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