13
REV 46599-20120703
ENGLISH
46599
OPERATION
Carburetor
Code
Main Jet
Part Number
Altitude
P19-2-Z
Standard
ST168FD-2-1131000-17Z
6000 Feet
(1800 Meters)
Altitude
ST168F-2-1131000-17Z
P19-2-H
Standard
ST168FD-2-1131000-17H
Altitude
ST168F-2-1131000-17H
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 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, 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 .
In order to select the correct high altitude main jet
it is necessary to identify the carburetor model . For
this purpose, a code is stamped on the side of the
carburetor . Select the correct main jet part number
corresponding to the carburetor code found on your
particular carburetor .
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