Engine Components; General Information; Technical Information; Tune-Up Specifications - Briggs & Stratton Fource 21000 Operating & Maintenance Instructions

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 Carburetor
2 Stop switch
3 Rope handle
4 Fuel fill
5 Air cleaner
6 Choke
7 Resistor spark plug
8 Fuel return hose
9 Fuel intake hose
10 Engine Model / Type / Code number
XXXXXX XXXX-XX
11 Oil fill / dipstick
12 Primer bulb
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
necessarily match the values derived using the foregoing
codes.
GB D DK E F

GENERAL INFORMATION

In the U.S.A., the 21000 and 21100 series engines covered in
this manual 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 Series 21000
Bore . . . . . . . . . . . . . . . . . . . . . .
Stroke . . . . . . . . . . . . . . . . . . . .
Displacement . . . . . . . . . . . . . 34 cc (2.074 cu. in.)
Model Series 21100
Bore . . . . . . . . . . . . . . . . . . . . . .
Stroke . . . . . . . . . . . . . . . . . . . .
Displacement . . . . . . . . . . . . . . 40 cc (2.44 cu. in.)

TUNE-UP SPECIFICATIONS

Spark plug gap . . . . . . . . . . . . . 0.76 mm (0.25 in.)
Armature air gap . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . (0.010 -- 0.014 in.)
Intake valve clearance . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . (0.002 -- 0.004 in.)
Exhaust valve clearance . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . (0.002 -- 0.004 in.)
Note: 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).

SAFETY SPECIFICATIONS

BEFORE OPERATING ENGINE
• Read entire Operating & Maintenance Instruc-
tions 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
equipment 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.
1
GR I N NL P S SF
Hazard Symbols and Meanings
Fire
Kickback
40 mm (1.575 in.)
International Symbols and Meanings
27 mm (1.065 in.)
40 mm (1.575 in.)
32 mm (1.250 in.)
Safety Alert
Read Operator's
Manual
0.25 -- 0.36 mm
A signal word (DANGER, WARNING, or CAUTION) is used
0.05 -- 0.10 mm
with the alert symbol to indicate the likelihood and the potential
severity of injury. In addition, a hazard symbol may be used to
0.05 -- 0.10 mm
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
indicates a situation that could result in damage to
the engine.
The engine exhaust from this product contains chemi-
cals 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.
GB
Hot Surface
Explosion Shock
Toxic Fumes Moving Parts
On Off Open Full
Stop
Choke Choke
Oil
Fuel
Primer
bulb
,
when used without the alert symbol,
WARNING
WARNING