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 1,500 metres, 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-metre 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 metres 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.
Possible Cause Correction
Grass and debris lodged under the
mower deck
Clean out the mower deck
(page 14).
Blades loose Tighten loose blade bolts
(page 11).
Blades bent, damaged, or
unbalanced by improper
sharpening
Take the mower to an
authorised Honda servicing
dealer for repair.
Mechanical damage, such as a
bent crankshaft
Possible Cause Correction
Mower is moving too fast for lawn
conditions
Reduce the pressure on the
Smart Drive control or push
the mower slower
Cutting height adjustment levers
set at different positions
Set all levers at the same
cutting height position
(page 6).
Grass bag clogged Wash the grass bag
(page 14).
Mower deck is clogged Clean out the mower deck
(page 14).
Blades dull, worn, or damaged Sharpen or replace the
blades if necessary
(page 11).
Wrong blades installed Install correct blades
(page 11).
ENGINE
SERIAL NUMBER
MODEL NAME AND
FRAME SERIAL NUMBER
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