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Operation at High Altitude
The density of air at high altitude is lower than at sea level. Engine power is
reduced as the air mass and air-fuel ratio decrease. Engine power and generator
output will be reduced approximately 3% for every 1000 feet of elevation above sea
level. This is a natural trend and cannot be changed by adjusting the engine. At
high altitudes increased exhaust emissions can also result due to the increased
enrichment of the air fuel ratio.
Other high altitude issues can include hard starting, increased fuel consumption
and spark plug fouling. To alleviate high altitude issues other than the natural
power loss, FIRMAN can provide a high altitude carburetor main jet.The alternative
main jet and installation instructions can be obtained by contacting Customer
Support. Installation instructions are also available in the Technical Bulletin area of
the FIRMAN internet site.
WARNING
Operation using the alternative main jet at elevations lower than the recommended
minimum altitude can damage the engine. For operation at lower elevations, the
standard main jet must be used. Operating the engine with the wrong engine
configuration at a given altitude may increase its emissions and decrease fuel
efficiency and performance.
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