18
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 610 metres (2,000 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-metre (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 610 metres (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 servicing dealer return
the carburetor to original factory specifications.
Specifications
Mower Features
Dimensions and Weights
* Cutting height set at 27 mm and handlebar set in highest position.
** Including grass bag
Engine Design and Performance
Transmission Design and Performance
Maintenance
ENGINE
SERIAL NUMBER
FRAME SERIAL NUMBER
HRN216VYU Honda rotary mower, 21-inch mower deck,
3-in-1 Clip Director
®
, Smart Drive variable
speed transmission, Roto-Stop
®
blade brake
clutch, Auto Choke System
Length 1,550 mm
Width 575 mm
Overall height* 1,037 mm
Dry mass [weight]** 39.9 kg
Cutting width 530 mm
Cutting heights
(approximate)
27 ~ 100 mm
Wheelbase 676 mm
Grass bag capacity 66 L
Noise level 97 dB(A)
Model GCV170
Type 4-stroke, overhead-valve,
single-cylinder, air-cooled
Displacement 166 cc
Bore and stroke 60 x 59 mm
Compression ratio 8.0:1
Ignition system Transistorized magneto
Transmission type Variable speed
Ground speeds 0 ~ 1.84 m/s
Item Description Page
Fuel Unleaded petrol with a pump
octane rating of 86 or higher
containing no more than 10%
ethanol by volume
Capacity: 0.91 L
See “AVOIDING FUEL-RELATED
PROBLEMS” on page 19 to
prevent fuel-related problems
page 6
Blade Bolt Torque 49 ~ 59 N•m page 13
Engine Oil SAE 10W-30, API SJ or later
Capacity: 0.40 L
Refill amount: 0.35 ~ 0.40 L*
page 14
Spark Plug Type: NGK - BPR5ES
Gap: 0.7 ~ 0.8 mm
page 15
Smart Drive Cable Adjust for proper operation. Shop
manual
Maximum Governed
Speed
2,950 ~ 3,100 rpm ** Shop
manual
Valve clearance
(cold)
Intake: 0.10 ± 0.02 mm
Exhaust: 0.10 ± 0.02 mm
Shop
manual
* Actual amount will vary due to residual oil in the engine. Always
use the dipstick to confirm the actual level (page 6).
** Do not over-speed the engine or alter governor settings.
Excessive speed is dangerous and shortens mower life.
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