16
Vibration
Mowing and Bagging Problems
TECHNICAL INFORMATION
Serial Number Locations
There are two serial numbers, one for the engine and one for the
mower frame. Record the engine and frame serial numbers in the
space below. You will need these serial numbers when ordering parts
and when making technical or warranty inquiries.
Engine serial number: _________________________________
Frame serial number: __________________________________
Date of purchase: _____________________________________
High Altitude Operation
At high altitudes, 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 lawn mower at altitudes
above 5,000 feet (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 1,000-foot (300-meter) increase in altitude. The
effect of altitude on horsepower will be greater than this if no
carburetor modification is made.
NOTICE
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 5,000 feet (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.
Emission Control System
Source of Emissions
The combustion process produces carbon monoxide, oxides of
nitrogen, and hydrocarbons. Control of hydrocarbons and oxides of
nitrogen is very important because, under certain conditions, they
react to form photochemical smog when subjected to sunlight. Carbon
monoxide does not react in the same way, but it is toxic.
Honda utilizes appropriate air/fuel ratios and other emissions control
systems to reduce the emissions of carbon monoxide, oxides of
nitrogen, and hydrocarbons. Additionally, Honda fuel systems utilize
components and control technologies to reduce evaporative
emissions.
U.S. and California Clean Air Acts, and Canadian
Environment Protection Act
U.S. EPA, California, and Canadian regulations require all
manufacturers to furnish written instructions describing the operation
and maintenance of emissions control systems.
The following instructions and procedures must be followed in order to
keep the emissions from your Honda engine within the emissions
standards.
Tampering and Altering
NOTICE
Tampering is a violation of Federal and California law.
Tampering with or altering the emissions control system may increase
emissions beyond the legal limit. Among those acts that constitute
tampering are:
• Removal or alteration of any part of the intake, fuel, or exhaust
systems.
• Altering or defeating the speed-adjusting mechanism to cause the
engine to operate outside its design parameters.
Possible Cause
Correction
Grass and debris lodged
under the mower deck
Clean out the mower deck (
Blades loose
Tighten loose blade bolts (
).
Blades bent, damaged, or
unbalanced by improper
sharpening
Take the mower to an authorized
Honda servicing dealer for repair.
Mechanical damage, such
as a bent crankshaft
Possible Cause
Correction
Mower is moving too fast
for lawn conditions
Apply less pressure to the Smart
Drive paddles.
Cutting height adjustment
levers set at different
positions
Set all levers at the same cutting
height position (
).
Grass bag clogged
Wash the grass bag (
).
Mower deck is clogged
Clean out the mower deck (
).
Blades dull, worn, or
damaged
Sharpen or replace the blades if
necessary (
).
Wrong blades installed
Install correct blades (
).
AMERICAN HONDA MOTOR CO., INC.
ALPHARETTA, GA 30005-8847
HRR2169VKA XX
MZCG –– XXXXXXX
AMERICAN HONDA MOTOR CO., INC.
ALPHARETTA, GA 30005-8847
MEETS CPSC BLADE SAFETY
REQUIREMENTS.
CONFORMS TO ANSI B 71.1 SAFETY STANDARD
ENGINE
SERIAL NUMBER
