Briggs & Stratton 21100 Series Operator's Manual download pdf (Page 6)

SPARK PLUG MAINTENANCE

Fig. 8

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

 on the spark plug to the

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.

DO NOT crank engine or test for spark with spark plug removed. Fuel could

ignite and cause injury.

WARNING

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.

To avoid injury or burns, clean engine when engine is cold.

WARNING

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.

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.

WARNING

• 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 100005. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Synthetic Oil 100074. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Oil pump kit (uses standard electric drill 5056. . . . . . . . . . . . . . . . . . . . . . . .

to remove oil from engine quickly)

Gas additive 5041. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Fuel hose assembly 696935. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Air filter-foam 696923. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Resistor spark plug 696876. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Spark tester 19368. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Spark plug wrench 89838 -or- 5023. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Repair manual 275072. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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 to find a dealer nearest you, or check the

Yellow Pages™".

™

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) 0.76 mm (0.025 in.). . . . . . . . . . . . . . . . . .

Spark plug gap (NGK style) 0.50 − 0.60 mm (0.020 − 0.024 in.). . . . . . . . . . .

Armature air gap 0.25 − 0.36 mm (0.010 − 0.014 in.). . . . . . . . . . . . . . . . . . .

Intake / exhaust valve clearance 0.05 − 0.10 mm (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).

Model 21000

Bore 40 mm (1.575 in.). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Stroke 27 mm (1.065 in.). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Displacement 34 cc (2.074 cu. in.). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Model 21100

Bore 40 mm (1.575 in.). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Stroke 31.75 mm (1.250 in.). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Displacement . . . . . . . . . . . . . 40 cc (2.44 cu. in. ). . . . . . . . . . . . . . . . . . . . .

TECHNICAL INFORMATION

Engine Power Rating Information

The gross power rating for individual gas engine models is labeled in accordance

with SAE (Society of Automotive Engineers) code J1940 (Small Engine Power &

Torque Rating Procedure), and rating performance has been obtained and corrected

in accordance with SAE J1995 (Revision 2002-05). Actual gross engine power will

be lower and is affected by, among other things, ambient operating conditions and

engine-to-engine variability. Given both the wide array of products on which engines

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

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.

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Briggs & Stratton 21100 Series Operator's Manual Page 6

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