Troubleshooting; Tune-Up Specifications; Technical Information - Briggs & Stratton Fource 21100 Operating And Maintenance Instructions Manual

Fig. 8
SPARK PLUG MAINTENANCE
The electrodes on a spark plug must be clean and sharp to produce the powerful
spark required for ignition. If the spark plug is worn or dirty, the engine may be hard to
start.. Replace the spark plug each season. Set the gap
following:
• Spark plug gap (Champion style) 0.64 mm or 0.025 in.
• Spark plug gap (NGK style) 0.50 − 0.60 mm or 0.020 − 0.024 in.
WARNING
DO NOT crank engine or test for spark with spark plug removed. Fuel could
ignite and cause injury.
KEEP ENGINE CLEAN
Periodically remove grass and chaff build-up from engine. Clean finger guard.
Do not spray engine with water to clean because water could contaminate fuel.
Clean with a brush or compressed air.
WARNING
To avoid injury or burns, clean engine when engine is cold.
STORAGE
The following precautions should be taken if storing unit for a period exceeding 30
days, or for seasonal storage.
• While engine is still warm, change oil.
• This unit may be stored in a variety of positions. It is best to store in horizontal
position with the spark plug up. Do not store or transport with the spark plug
down. If stored with spark plug down, it will result in hard starting.
• Clean engine of surface debris, chaff or grass.
• Drain all fuel from fuel tank into proper receptacle for storage.
• Press the primer bulb 15 times to purge fuel from carburetor and fuel lines.
• Remove spark plug. Place 1 teaspoon or 5 cc of oil into spark plug hole.
• Pull starter rope slowly 8-10 times to properly coat the cylinder bore and piston
for storage. Replace spark plug and tighten. Any residual oil may burn off in
subsequent starts. This may result in white smoke emission from muffler.
WARNING
Store in a clean, dry area. DO NOT store near a stove, furnace or water
heater which uses a pilot light or any device that can create a spark.
• When removing the unit from storage, only use fresh gasoline. Perform
operation checks, see maintenance schedule, before starting engine.
SERVICE
See an Authorized Briggs & Stratton Service Dealer. Each one carries a stock of
Genuine Briggs & Stratton Parts and is equipped with special service tools.
Partial List of Genuine Briggs & Stratton Parts
Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Synthetic Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Oil pump kit (uses standard electric drill
to remove oil from engine quickly)
Gas additive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel hose assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air filter-foam . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Resistor spark plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Spark tester . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Spark plug wrench . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Repair manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
To purchase, or view other products Briggs & Stratton has available, see an
Authorized Briggs & Stratton Service Dealer. Use our web site at
www.briggsandstratton.com
Yellow Pages™".
Ë
on the spark plug to the
. . . . . . . . . . . . . . . . . . . . . . . .
89838 -or- 5023
to find a dealer nearest you, or check the
Walking fingers logo and Yellow Pages" are registered
trademarks in various jurisdictions.
™
Need Assistance? Go to the website or call, 1-800-233-3723, (U.S.A. and
Canada) to hear a menu of pre-recorded messages offering engine mainte-
nance information.

TROUBLESHOOTING

Engine will not start
Out of fuel
•
Prime engine
•
If engine is cold, ensure choke is set correctly.
•
Add fuel
Engine flooded
•
Set choke to FULL CHOKE position and continue to pull starter
handle.
Fouled spark plug / engine fails to produce spark
•
Remove spark plug and clean it. Check the spacing on the electrode
and set the gap to the correct dimension. See Maintenance Section. If
plug is damaged, replace with a new spark plug.
•
Ensure the spark plug is installed and wire is connected.
Engine is smoking or running rough
•
There maybe slight oil accumulation in the crankcase upon starting.
This is normal.
•
If excessive smoke or smoke is heavy, ensure choke is in OFF
CHOKE position.
•
Check for fouled spark plug.
•
Check air filter for debris.

TUNE-UP SPECIFICATIONS

Spark plug gap (Champion style)
Spark plug gap (NGK style)
Armature air gap . . . . . . . . . . . . . . . . . . .
Intake / exhaust valve clearance
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).
Model 21000
Bore . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stroke . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Displacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model 21100
Bore . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stroke . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Displacement . . . . . . . . . . .
100005

TECHNICAL INFORMATION

100074
5056
Engine Power Rating Information
The gross power rating for individual gas engine models is labeled in accordance
5041
with SAE (Society of Automotive Engineers) code J1940 (Small Engine Power &
696935 Torque Rating Procedure), and rating performance has been obtained and corrected
in accordance with SAE J1995 (Revision 2002-05). Actual gross engine power will
696923
be lower and is affected by, among other things, ambient operating conditions and
696876
engine-to-engine variability. Given both the wide array of products on which engines
19368
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 horsepower). This difference
275072
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-en-
gine variability. Due to manufacturing and capacity limitations, Briggs & Stratton may
substitute an engine of higher rated power for this Series engine.
4
. . . . . . . . . . . . . . . . . . 0.76 mm (0.025 in.)
. . . . . . . . . . . 0.50 − 0.60 mm (0.020 − 0.024 in.)
0.25 − 0.36 mm (0.010 − 0.014 in.)
. . . . . . . . 0.05 − 0.10 mm (0.002 − 0.004 in.)
40 mm (1.575 in.)
27 mm (1.065 in.)
34 cc (2.074 cu. in.)
40 mm (1.575 in.)
31.75 mm (1.250 in.)
. . . . . . . . . . . . . . . . . . . . . . . 40 cc (2.44 cu. in. )