Briggs & Stratton 470000 - Manual (Page 11)

11
Engine Specifications
We recommend that you contact an authorized Briggs
& Stratton Service Dealer for all maintenance and
service of the engine and engine parts. Use only
genuine Briggs & Stratton parts.
In the state of California, Model 470000 engines are
certified by the California Air Resources Board to meet
emissions standards for 250 hours. Model 610000
engines are certified for 1000 hours. Such certification
does not grant the purchaser, owner or operator of this
engine any additional warranties with respect to the
performance or operational life of this engine. This
engine is warranted solely according to the product and
emissions warranties stated elsewhere in this manual.
Model 470000
Bore
3.19 in. (81 mm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stroke 2.87 in. (73 mm) . . . . . . . . . . . . . . . . . . . . . . . . . . .
Displacement 45.9 cu. in. (752 cc) . . . . . . . . . . . . . . . . . .
Model 610000
Bore
3.36 in. (85.5 mm) . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stroke 3.40 in. (86.5 mm) . . . . . . . . . . . . . . . . . . . . . . . . .
Displacement 60.6 cu. in. (993 cc) . . . . . . . . . . . . . . . . . .
Tune up Specifications
Armature air gap
0.005 − 0.007 in. (0.13 − 0.18 mm) . .
Spark plug gap 0.020 in. (0.51 mm) . . . . . . . . . . . . . . . . .
Valve clearance with valve springs installed and piston 1/4
in. (6 mm) past top dead center (check when engine is
cold).
Intake
0.007 − 0.010 in. (0.18 − 0.25 mm) . . . . . . . . . . . .
Exhaust 0.007 − 0.010 in. (0.18 − 0.25 mm) . . . . . . . . . .
Note: For practical operation, the horsepower loading
should not exceed 85% of rated horsepower. Engine
power will decrease 3-1/2% for each 1,000 feet (300
meters) above sea level and 1% for each 10 ° F (5.6° C)
above 77 ° F (25° C). It will operate satisfactorily at an
angle up to 25 °.
Model, Type and Code Number
To get replacement parts or technical assistance in the
future write your engine Model, Type and Code number
along with the date of purchase here. These numbers
are located on your engine, see Engine Features
(page 3).
Model
Type
Code
Month/Day/Year
Technical Information
Engine Power Rating Information
The gross power rating for individual gas engine
models is labeled in accordance with SAE (Society of
Automotive Engineers) code J1940 (Small Engine
Power & Torque Rating Procedure), and rating
performance has been obtained and corrected in
accordance with SAE J1995 (Revision 2002-05). Actual
gross engine power will be lower and is affected by,
among other things, ambient operating conditions and
engine-to-engine variability. Given both the wide array
of products on which engines are placed and the
variety of environmental issues applicable to operating
the equipment, the gas engine will not develop the
rated gross power when used in a given piece of power
equipment (actual “on-site” or net horsepower). This
difference is due to a variety of factors including, but
not limited to, accessories (air cleaner, exhaust,
charging, cooling, carburetor, fuel pump, etc.),
application limitations, ambient operating conditions
(temperature, humidity, altitude), and engine-to-engine
variability. Due to manufacturing and capacity
limitations, Briggs & Stratton may substitute an engine
of higher rated power for this Series engine.
Emission Information
Engines that are certified to meet the California Air
Resources Board (CARB) Tier 2 Emission Standards
must display information regarding the Emissions
Durability Period and the Air Index. Briggs & Stratton
makes this information available to the consumer on
our emission labels. The engine emission label will
indicate certification information.
The Emissions Durability Period describes the
number of hours of actual running time for which the
engine is certified to be emissions compliant, assuming
proper maintenance in accordance with the Operating
& Maintenance Instructions. The following categories
are used:
Moderate:
Engine is certified to be emission compliant for 125
hours of actual engine running time.
Intermediate:
Engine is certified to be emission compliant for 250
hours of actual engine running time.
Extended:
Engine is certified to be emission compliant for 500
hours of actual engine running time. For example, a
typical walk-behind lawn mower is used 20 to 25 hours
per year. Therefore, the Emissions Durability Period
of an engine with an intermediate rating would equate
to 10 to 12 years.
Certain Briggs & Stratton engines will be certified to
meet the United States Environmental Protection
Agency (USEPA) Phase 2 emission standards. For
Phase 2 certified engines, the Emissions Compliance
Period referred to on the Emissions Compliance label
indicates the number of operating hours for which the
engine has been shown to meet Federal emission
requirements.
For engines less than 225 cc displacement.
Category C = 125 hours
Category B = 250 hours
Category A = 500 hours
For engines of 225 cc or more displacement.
Category C = 250 hours
Category B = 500 hours
Category A = 1000 hours.