High Altitude Warning
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. Outboard motor output will be reduced. This is a natural trend
and cannot be changed by adjusting the engine. At sufficiently 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, dealer can provide a high
altitude carburetor main jet. The alternative main jet and installation instructions can be obtained
by contacting Customer Support.
The part number and recommended minimum altitude for the application of the high altitude
carburetor main jet are listed in the table on the next page.
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