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Engine Specifications
CAUTION
Operation of this engine is for the application it was
intended for. All the components used to build this
engine assembly must remain in place for the proper
operation of this engine.
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.
Model Series 120000
Bore
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stroke
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Displacement
. . . . . . . . . . . . . . . . . . . .
Tune-up Specifications
Armature air gap
. . . . .
0.010 − 0.014 in. (0.25 − 0.36 mm)
Spark plug gap
. . . . . . . . . . . . . . . . . . . .
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 270962.
Intake
. . . . . . . . . . . . . . .
0.004 − 0.006 in. (0.10 − 0.15 mm)
Exhaust
. . . . . . . . . . . . .
0.009 − 0.011 in. (0.23 − 0.28 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 15°.
Model, Type and Code Number
To get replacement parts or technical assistance in the
future write you 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 Series
Type
Code
10
Technical Information
Power Ratings: The power ratings for an individual engine
model are initially developed by starting with SAE (Society
of Automotive Engineers) code J1940 (Small Engine
Power & Torque Rating Procedure) (Revision 2002-05).
Given both the wide array of products on which our
engines are placed, and the variety of environmental
issues applicable to operating the equipment, it may be
that the engine you have purchased will not develop the
rated horsepower when used in a piece of power
equipment (actual "on-site" power). This difference is due
to a variety of factors including, but not limited to, the
2.69 in. (68.26 mm)
following: differences in altitude, temperature, barometric
2.04 in. (52 mm)
pressure, humidity, fuel, engine lubrication, maximum
governed engine speed, individual engine to engine
11.57 cu. in. (190 cc)
variability, design of the particular piece of power
equipment, the manner in which the engine is operated,
engine run-in to reduce friction and clean out of combustion
chambers, adjustments to the valves and carburetor, and
other factors. The power ratings may also be adjusted
0.030 in. (0.76 mm)
based on comparisons to other similar engines utilized in
similar applications, and will therefore not necessarily
match the values derived using the foregoing codes.
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