Honda GX270 Owner's Manual page 17

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Carburetor Modifications for High Altitude Operation
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, 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 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 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.
Specifications
GX270 (PTO shaft type S, with fuel tank)
Length×Width×Height
Dry mass [weight]
Engine type 4-stroke, overhead valve, single cylinder
Displacement
[Bore×Stroke]
Net power
(in accordance
with SAE J1349*)
Max. net torque
(in accordance
with SAE J1349*)
Engine oil capacity
Fuel tank capacity
Cooling system
Ignition system
PTO shaft rotation
*
The power rating of the engine indicated in this document is the
net power output tested on a production engine for the engine
model and measured in accordance with SAE J1349 at 3,600
rpm (Net Power) and at 2,500 rpm (Max. Net Torque). Mass
production engines may vary from this value.
Actual power output for the engine installed in the final machine
will vary depending on numerous factors, including the operating
speed of the engine in application, environmental conditions,
maintenance, and other variables.
ENGLISH
355×430×410 mm
25.0 kg
3
270 cm
[77.0×58.0 mm]
6.0 kW(8.2 PS) at 3,600 rpm
17.7 N·m (1.80 kgf·m) at
2,500 rpm
1.1 L (1.0 lmp qt)
5.3 L (1.17 lmp gal)
Forced air
Transistor magneto
Counterclockwise
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