Note: (This note applies only to engines used in the U.S.A.) Maintenance, replacement or repair of the emission control devices and systems may be performed by any nonroad
engine repair establishment or individual. However, to obtain no charge repairs under the terms and provisions of the Briggs & Stratton warranty statement, any service or
emission control part repair or replacement must be performed by a factory authorized dealer.
ENGINE COMPONENTS
Fig. 1
1
Starter Handle
2
Primer Bulb
3
Carburetor
4
Engine Model Type
Code
xxxxxx xxxx xx
xxxxxxxx
5
Stop Switch
6
Choke Control
7
Spark Plug
8
Fuel Fill
9
Muffler
10
Dipstick / Oil Fill / Top Oil Drain
11
Bottom Oil Drain
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.
Record your engine Model, Type and Code numbers here for
future use.
Record your date of purchase here for future use.
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 necessari
ly match the values derived using the foregoing codes.
GENERAL INFORMATION
This is a single cylinder, L head, air cooled engine. It is a low
emissions engine.
In the state of California, the 120000 series engines covered in
this manual are certified by the California Air Resources Board
to meet emissions standards for 125 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 Series 120000
Bore
. . . . . . . . . . . . . . . . . . . . . . . . . . .
Stroke
. . . . . . . . . . . . . . . . . . . . . . . . .
Displacement
. . . . . . . . . . . . . . . . .
TUNE UP SPECIFICATIONS
Valve clearance with valve springs installed and piston 6 mm
past top dead center. Check when engine is cold.
Intake
. . . . . . . . . . . . . . .
0.10 0.15 mm (0.004 0.006 in.)
Exhaust
. . . . . . . . . . . . . .
0.23 0.28 mm (0.009 0.011 in.)
Armature air gap
. . . . . . .
0.25 0.36 mm (0.010 0.014 in.)
Spark plug gap
. . . . . . . . . . . . . . . .
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°.
SAFETY SPECIFICATIONS
BEFORE OPERATING
ENGINE
• Read entire Operating & Maintenance Instructions AND
the instructions for the equipment this engine powers.*
• Failure to follow instructions could result in serious injury
or death.
* Briggs & Stratton does not necessarily know what equip
ment this engine will power. For that reason, you should
carefully read and understand the operating instructions for
the equipment on which your engine is placed.
THE OPERATING &
MAINTENANCE INSTRUCTIONS
CONTAIN SAFETY
INFORMATION TO:
• Make you aware of hazards associated with engines
• Inform you of the risk of injury associated with those
hazards, and
• Tell you how to avoid or reduce the risk of injury.
A signal word (DANGER, WARNING, or CAUTION) is used
with the alert symbol to indicate the likelihood and the potential
severity of injury. In addition, a hazard symbol may be used to
represent the type of hazard.
DANGER indicates a hazard which, if not avoided,
will result in death or serious injury.
WARNING indicates a hazard which, if not avoided,
could result in death or serious injury.
CAUTION indicates a hazard which, if not avoided,
might result in minor or moderate injury.
,
CAUTION
when used without the alert symbol,
indicates a situation that could result in damage to
the engine.
1
Hazard Symbols and Meanings
Fire
Kickback
International Symbols and Meanings
68 mm (2.69 in.)
52 mm (2.05 in.)
190 cc (11.57 cu. in.)
Safety Alert
Read Operator's
Manual
0.76 mm (0.030 in.)
The engine exhaust from this product contains chemicals
known to the State of California to cause cancer, birth
defects, or other reproductive harm.
Briggs & Stratton does not approve or authorize the use of
these engines on 3 wheel All Terrain Vehicles (ATVs),
motor bikes, aircraft products or vehicles intended for use
in competitive events. Use of these engines in such
applications could result in property damage, serious injury
(including paralysis), or even death.
• If there is natural or LP gas leakage in area, do not
start engine.
• Do not use pressurized starting fluids because
vapors are flammable.
• Start and run engine outdoors.
• Do not start or run engine in enclosed area, even if
doors or windows are open.
GB
Hot Surface
Explosion
Shock
Toxic Fumes
Moving Parts
Choke
Oil
Fuel
On Off
Stop
Fuel Shutoff
WARNING
WARNING
WARNING
Starting engine creates sparking.
Sparking can ignite nearby flammable gases.
Explosion and fire could result.
WARNING
Engines give off carbon monoxide, an
odorless, colorless, poison gas.
Breathing carbon monoxide can cause
nausea, fainting or death.