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11
Specifications
All the components used to build this engine
assembly must remain in place for the proper
operation of this engine.
CAUTION
We recommend that you use an authorized Briggs &
Stratton Service Dealer for all maintenance and service
of the engine and engine parts. Use only genuine
Briggs & Stratton parts.
GENERAL INFORMATION
This is a single cylinder, air-cooled engine. It is a low
emissions engine.
In the state of California, Model 21000 and 21100 engines
are certified by the California Air Resources Board to
meet emissions standards for 50 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 21000
Bore 1.575 in. (40 mm). . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stroke 1.065 in. (27 mm). . . . . . . . . . . . . . . . . . . . . . . . . .
Displacement 2.074 cu. in. (34 cc). . . . . . . . . . . . . . . . . .
Model 21100
Bore 1.575 in. (40 mm). . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stroke 1.250 in. (31.75 mm). . . . . . . . . . . . . . . . . . . . . . .
Displacement 2.44 cu. in. (40 cc). . . . . . . . . . . . . . . . . . .
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).
Tune-Up Specifications
Armature air gap 0.010 − 0.014 in. (0.25 − 0.36 mm). .
Spark plug gap 0.025 in. (0.64 mm). . . . . . . . . . . . . . . . .
Valve clearance with valve springs installed and piston 1/4
in. (6 mm) past top dead center (check when engine is
cold). See Repair Manual P/N 271172.
Intake 0.002 − 0.004 in. (0.05 − 0.10 mm). . . . . . . . . . . .
Exhaust 0.002 − 0.004 in. (0.05 − 0.10 mm). . . . . . . . . .
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. For the location, see
page 3, Engine Features.
Model
Type
Code
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).
Torque values are derived at 3060 RPM; horsepower
values are derived at 3600 RPM. 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 power). 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 50
hours of actual engine running time.
Intermediate: Engine is certified to be emission compliant for
125 hours of actual engine running time.
Extended: Engine is certified to be emission compliant for 300
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 handheld engines:
Category C = 50 hours
Category B = 125 hours
Category A = 300 hours