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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.69 in. (68.26 mm) Stroke . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.04 in. (52 mm) Displacement . . . . . . . . . . . . . . . . . . . . 11.57 cu. in. (190 cc)

Tune-up Specifications

Armature air gap . . . . . 0.010 − 0.014 in. (0.25 − 0.36 mm) Spark plug gap . . . . . . . . . . . . . . . . . . . . 0.030 in. (0.76 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 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 SeriesTypeCode

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 following: differences in altitude, temperature, barometric pressure, humidity, fuel, engine lubrication, maximum governed engine speed, individual engine to engine 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 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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