REV 41332-20120120
14
41332
ENGLISH
OPERATION
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 3½% for every 1000
feet of elevation above sea level . 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 .
Part Number
Altitude
Standard main jet
ST188FD-1131000-17
4000 Feet
(1200 Meters)
Altitude main jet
188 .131017 .01
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 .
WARNING
To alleviate high altitude issues other than the natural
power loss, Champion Power Equipment 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
Champion Power Equipment internet site .
The part number and recommended minimum altitude
for the application of the high altitude carburetor main
jet is listed in the table below .
