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Honda Honda Engines GX120 Regular Manual

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TAKING CARE OF UNEXPECTED PROBLEMS TECHNICAL & CONSUMER INFORMATION
ENGINE WILL
NOT START
Possible Cause Correction
ENGINE LACKS
POWER
Possible Cause Correction
TECHNICAL INFORMATION
Serial Number Location
Carburetor Modifications for High Altitude Operation
ENGLISH
SERIAL NUMBER &
ENGINE TYPE LOCATION
11
Fuel valve and/
or fuel filler cap
vent valve OFF.
Choke open.
Engine switch
OFF.
Out of fuel.
Bad fuel; engine
stored without
treating or
draining
gasoline, or
refueled with
bad gasoline.
Spark plug faulty,
fouled, or
improperly
gapped.
Spark plug wet
with fuel
(flooded engine).
Fuel filter
restricted,
carburetor
malfunction,
ignition
malfunction,
valves stuck, etc.
Check control
positions.
Check fuel.
Remove and
inspect spark
plug.
Take engine to
an authorized
Honda
servicing
dealer, or refer
to shop
manual.
Check air filter.
Check fuel.
Take engine to
an authorized
Honda
servicing
dealer, or refer
to shop
manual.
Filter element(s)
restricted.
Bad fuel; engine
stored without
treating or
draining
gasoline, or
refueled with
bad gasoline.
Fuel filter
restricted,
carburetor
malfunction,
ignition
malfunction,
valves stuck, etc.
Clean or replace
filter element(s)
(p. 8).
Drain fuel tank and
carburetor (p. 10).
Refuel with fresh
gasoline (p. 6).
Replace or repair
faulty components
as necessary.
Record the engine serial
number in the space below. You
will need this information when
ordering parts and when
making technical or warranty
inquiries.
Engine serial number: __ __ __ __ __ __ __ __ __ __ __
Engine type: ___ ___ ___ ___
Date Purchased: ______ / ______ / ______
At high altitude, the standard carburetor air-fuel mixture will be
too rich. Performance will decrease, and fuel consumption will
increase. A very rich mixture will also foul the spark plug and
cause hard starting. Operation at an altitude that differs from that
at which this engine was certified, for extended periods of time,
may increase emissions.
High altitude performance can be improved by specific
modifications to the carburetor. If you always operate your engine
at altitudes above 1,500 meters (5,000 feet), have your servicing
dealer perform this carburetor modification. This engine, when
operated at high altitude with the carburetor modifications for
high altitude use, will meet each emission standard throughout its
useful life.
Even with carburetor modification, engine horsepower will
decrease about 3.5% for each 300-meter (1,000-foot) increase in
altitude. The effect of altitude on horsepower will be greater than
this if no carburetor modification is made.
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 1,500 meters (5,000 feet) with a modified
carburetor may cause the engine to overheat and result in serious
engine damage. For use at low altitudes, have your servicing
dealer return the carburetor to original factory specifications.
Turn valve(s) ON.
Move lever to
CLOSED position
unless the engine
is warm.
Turn engine switch
to ON position.
Refuel (p. 6).
Drain fuel tank and
carburetor (p. 10).
Refuel with fresh
gasoline(p. 6).
Gap or replace
spark plug (p. 8).
Dry and reinstall
spark plug. Start
engine with
throttle lever in
MAX. position.
Replace or repair
faulty components
as necessary.
1.
2.
3.
4.
1.
2.
3.
05/02/09 13:19:30 32Z4F800_011
… 11 …


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