The part number and recommended minimum altitude for the application of the high altitude carburetor main
jet are listed in the table below.
MODEL MAIN JET PART NUMBER ALTITUDE
F6/8
Standard Main Jet H170-1A-S
2000 Feet (609.6 Meters)
Altitude Main Jet H170×1.35
F9.8
Standard Main Jet H170-1A-S
2000 Feet (609.6 Meters)
Altitude Main Jet H170×2.7
Operating the engine with the wrong engine configuration at a given altitude may increase its
emissions and decrease fuel efficiency and performance. When the carburetor has been modified for
high altitude operation, the air-fuel mixture will be too lean for low altitude use. Operation at altitudes
below 609.6 meters (2,000 feet) with a modified carburetor may cause the engine to overheat and
result in serious engine damage. For use at low altitudes, have your dealer return the carburetor to
original factory specifications.
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