Briggs & Stratton Engine 276344 Operators Manual

							11
MAINTENANCE
AIR CLEANER
CAUTION: Do not use pressurized air or solvents to clean cartridge. Pressurized air can damage cartridge;
solvents will dissolve cartridge.
FLAT AIR CLEANER REMOVAL/ INSTALLATION
[1] Pull up on air cleaner cover handle, and rotate toward
engine.
[2] Remove air cleaner cover.
[3] Carefully lift air cleaner cartridge and pre-cleaner, if
equipped, from blower housing.
Note: To clean pre-cleaner, wash in soapy water. Squeeze
dry in a clean cloth. DO NOT OIL.
[4] Clean base of air cleaner cartridge area carefully
 to
prevent debris from entering engine.
[5] Place air cleaner pre-cleaner, if equipped, and cartridge
into blower housing. Cartridge must fit securely in base.
[6] Align tabs on cover with slots of blower housing and
replace cover.
[7] Hook handle and close cover.
If filters, or covers are not installed
correctly serious injury or death
could result from backfire. Do not
attempt to start your engine with
them removed.
WARNING
EXTENDED LIFE SERIES CARTRIDGE ONLY
This filter, 
IF STAMPED
‘WASHABLE’, can
be washed with
warm water and
mild soap.
IMPORTANT:
Rinse in tap water
with SCREEN side
up allowing dirt
and debris to filter
out.
Leave filter to dry
overnight before
reinstalling.
COVER  PRE-CLEANER
(if equipped)
TABSCARTRIDGE
SLOTS 
						

							12
MAINTENANCE
HIGH FLOW AIR CLEANER MAINTENANCE
Perform this maintenance every 25 hours or every season,
clean more often under dusty conditions or when airborne
debris is present. This filter is made of cotton, which is
different from a standard paper filter, therefore it MUST be
oiled.
[1] Remove clamp and pull air cleaner from intake
manifold.
[2] Remove as much dirt from the filter as possible.
[3] Using the High Flow Air Filter Cleaner Kit, Briggs &
Stratton part no. 5089D, spray the filter with cleaner.
Allow the solution to soak in to the filter for about 15
minutes.
CAUTION: Never use strong detergents, high
pressure water, or gasoline to clean this filter.
[4] Rinse the filter with warm water, inside first and then
outside. (Let the water run from the clean side to the
dirty side.)
[5] Allow the filter to dry completely. It is best to allow the
filter to dry naturally. Don’t use heat, this might shrink
the cotton.
[6] Use only air filter oil, such as the oil included in the
cleaning kit (P/N 5089D), to re-oil the filter.
WARNING
Never use motor oil, transmission fluid, WD40, or other
oils. Failure to follow instructions can cause fires
resulting in death or serious injury. Use only air filter oil
designed specifically for air filters.
[7] Spray the filter with oil, or pour small amount onto
each pleat and allow filter to stand for 20 minutes. The
filter is correctly oiled when the cotton changes from
white to the color of the oil.
CAUTION: DO NOT over-oil air filter, it will interfere
with engine performance and may cause engine
damage. If the filter is placed on cardboard for 10
minutes and leaves a stain, it is over oiled. Wash/clean
and re-oil per above instructions.
[8] Re-install air filter.
CARBURETOR
CLAMPHIGH FLOW
AIR FILTER
FILTER
P/N 698973
OIL FILTER (IF EQUIPPED)
Replace oil filter after every 100 hours of operation.
[1] Drain engine oil and remove oil filter.
[2] Before installing new filter, lightly oil filter gasket with
fresh, clean engine oil.
[3] Screw filter on by hand until gasket contacts oil filter
adapter. Tighten 1/2 to 3/4 turn more.
[4] Add fresh oil. Fill to FULL line on dipstick.
[5] Start and run engine at idle to check for oil leaks.
[6] Stop engine. Recheck oil level and add oil if required.
OIL PRESSURE
If oil pressure drops too low, an oil pressure switch (if
engine is equipped) will either activate a warning light or
stop the engine. Check oil level with dipstick. If oil level is
between ADD and FULL mark on dipstick, Do not try to
restart engine. Contact an Authorized Briggs & Stratton
Service Dealer. Do not operate engine until oil pressure is
corrected.
If oil level is below ADD mark on dipstick, add oil to bring
level to FULL mark. Restart engine and check oil pressure.
If pressure is normal, continue to operate engine.
Note: Oil pressure gauge, if engine is equipped, is supplied
by manufacturer of equipment. 
						

							13
MAINTENANCE
ENGINE AND ENGINE PARTS
We recommend that you see an authorized Briggs & Stratton Service Dealer for all maintenance and service of the engine
and engine parts. Use only genuine Briggs & Stratton parts.
WARNING
If you perform any maintenance on the engine, first disconnect the spark plug wire
from the spark plug, and disconnect the battery at the negative terminal (electric
starter engines only) to prevent unintentional sparking. Unintentional sparking can
result in fire or electric shock. Unintentional start-up can result in entanglement,
traumatic amputation or laceration. Use only correct tools.
WARNING
•Do not strike the flywheel with a hammer or hard object because the flywheel may
later shatter during operation.
•Do not tamper with governor spring, links or other parts to increase engine speed.
Replacement parts for the muffler
must be the same and installed in the
same position as the original parts,
otherwise fire can occur.WARNING
If muffler is equipped with spark arrester screen, remove
screen for inspection. Replace screen if damaged or
plugged.
MUFFLER
SPARK PLUG
Use only Briggs & Stratton Spark Tester (part number
19368) to check for spark.
Check the spark plug every season. Replace the spark plug
if upon inspection the electrodes are burned or worn.
Ensure the spark plug is clean. Check the gap with a feeler
gage and reset to 0.030 in. (0.76 mm) if necessary.
Note: In some areas, local law requires using resistor
spark plug to suppress ignition signals. If this engine was
originally equipped with resistor spark plug, use same
type for replacement.
.030” (0.76 mm)
WIRE GAGE
REPLACE FUEL FILTER (if equipped)
WARNINGEXTENDED LIFE SERIES™ FUEL FILTER
PART NO. 695666 OR 5070
(WITH FUEL PUMP)
Drain fuel tank or close
fuel shut-off valve before
replacing fuel filter.
Otherwise, fuel can leak
out, creating a fire/ex-
plosion hazard.STANDARD FUEL FILTER
FUEL HOSE
CLAMPS
PART NO. 298090 OR 5018
(WITHOUT FUEL PUMP)PART NO. 394358
(WITH FUEL PUMP)
Debris may clog the engine’s air cooling system. Remove
blower housing and clean area shown to prevent
overheating and engine damage.
AIR COOLING SYSTEMCLEAN OUT CHAFF AND
DEBRIS 
						

							14
MAINTENANCE
CLEANING DEBRIS
Engine parts should be kept clean to
reduce the risk of overheating and
ignition of accumulated debris.  This is
especially important if cutting tall grass.WARNING
CAUTION: Do not use water to clean engine parts.
Water could contaminate fuel system. Use a brush
or dry cloth.
Finger Guard
CLEAN
CLEAN
Rotating Screen
Daily or before every use, clean grass, chaff or accumu-
lated debris from engine. Keep linkage, spring and
controls clean. Keep area around and behind muffler free
of any combustible debris.
Linkage, Springs,
Controls
CLEAN
CLEAN
Muffler, 
Spark Arrester 
						

							15
SERVICE & STORAGE
PARTIAL LIST OF BRIGGS & STRATTON PARTS
Models 280000, 310000 AVS series
Extended Life Series flat air cleaner cartridge 697153
(washable, no pre-cleaner required)
Extended Life Series Maintenance Kit 5128. . . . . . . . 
(Includes oil, A/C filter, spark plug, gas additive)
Flat air cleaner cartridge and pre-cleaner kit  5077. . . . . 
Flat air cleaner cartridge  698083. . . . . . . . . . . . . . . . . . . . 
Flat air cleaner pre-cleaner 697015. . . . . . . . . . . . . . . . . . 
Maintenance Kit 5127. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
(Includes oil, A/C filter, spark plug, gas additive)
UL Approved flat air cleaner cartridge  790263. . . . . . . . . 
(For NG/LPG Gaseous Fuel engines.)
Model 210000 AVS
 series
Flat air cleaner cartridge and pre-cleaner kit  5079. . . . . 
Flat air cleaner cartridge  698413. . . . . . . . . . . . . . . . . . . . 
Flat air cleaner pre-cleaner 697292. . . . . . . . . . . . . . . . . . 
Maintenance Kit 5126. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
(Includes oil, A/C filter, spark plug, gas additive)
Oval air cleaner cartridge and pre-cleaner kit  5053. . . . 
Oval air cleaner cartridge 496894. . . . . . . . . . . . . . . . . . . . 
Oval air cleaner pre-cleaner 272403. . . . . . . . . . . . . . . . . . 
High Flow Air Filter (cylinder) 698973. . . . . . . . . . . . . . . . 
High Flow Air Filter Cleaning Kit 5089D. . . . . . . . . . . . . . . 
Synthetic Oil (32 oz.) 100074. . . . . . . . . . . . . . . . . . . . . . . 
Oil (20 oz.) 100005. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
Oil (48 oz.) 100028. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
Oil filter (3-1/2 in. long) 491056. . . . . . . . . . . . . . . . . . . . . . 
Oil filter (2-1/4 in. long) 492932. . . . . . . . . . . . . . . . . . . . . . 
Fuel filter  298090 -or- 5018. . . . . . . . . . . . . . . . . . . . . . . . . 
(for engines without fuel pump installed)
Extended Life Series™ fuel filter 695666 -or- 5070. . . . . . 
(for engines equipped with fuel pump)
Fuel filter  394358. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
(for engines equipped with fuel pump)
Gas additive 5041. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
Resistor spark plug 491055. . . . . . . . . . . . . . . . . . . . . . . . . 
Long life platinum spark plug 5066. . . . . . . . . . . . . . . . . . . 
(used on most OHV engines)
Spark plug wrench 89838 -or- 5023. . . . . . . . . . . . . . . . . . . 
Spark tester 19368. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
Oil pump kit 5056. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
(uses standard electric drill to remove oil from engine quickly)
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. Trained mechanics
assure expert repair service on all Briggs & Stratton
engines. Only dealers advertising as “Authorized Briggs &
Stratton” are required to meet Briggs & Stratton standards.When you purchase equipment powered by a
Briggs & Stratton engine, you are assured of
highly skilled, reliable service at more than
30,000 Authorized Service Dealers
worldwide, including more than 6,000 Master
Service Technicians. Look for these signs
wherever Briggs & Stratton service is offered.
You may locate your nearest Authorized Briggs & Stratton
Service Dealer in our dealer locator map on our web site
www.briggsandstratton.com or in the “Yellow Pages™”
directory under “Engines, Gasoline” or “Gasoline
Engines,” or “Lawn Mowers” or similar category.
Note: Walking fingers logo and “Yellow Pages” are regis-
tered trademarks in various jurisdictions.
™
An illustrated shop manual includes
common specifications and detailed
information covering adjustment,
tune-up and repair of Briggs & Strat-
ton single cylinder, OHV, 4 cycle
engines. It is available for purchase
from an Authorized Briggs & Stratton
Service Dealer or you can order it
from the factory. Write:
Briggs & Stratton Corporation
Attn: Service Division
P. O. Box 1144
Milwaukee, WI 53201
Part No. 272147
STORAGE
Engines stored over 30 days need special attention.
[1] To prevent gum from forming in fuel system or on
essential carburetor parts:
a) if fuel tank contains oxygenated or reformulated
gasoline (gasoline blended with an alcohol or an
ether), run engine until it stops from lack of fuel, or b) if
fuel tank contains gasoline, either run engine until it
stops from lack of fuel, or add a gasoline additive to the
gas in the tank. (See parts list. Single−use pouches of
gas additive are available from your service dealer.) If
you use a gas additive, run the engine for several
minutes to circulate the additive through the carburetor.
Then, engine and fuel can be stored up to 24 months.
[2] While engine is still warm, change oil.
[3] Remove spark plug and pour about 1 oz. (30 ml) of
engine oil into cylinder. Replace spark plug and crank
slowly to distribute oil.
[4] Clean engine of surface debris, chaff or grass.
WARNING
[5] Store in a clean, dry area.
Do not store in same area
as a stove, furnace, water
heater, or other appliance
that uses a pilot light or
has a device that can
create a spark. 
						

							16
BRIGGS & STRATTON ENGINE OWNER WARRANTY POLICY
Effective September 1, 2006 
Briggs & Stratton Corporation will repair or replace, free of charge, any part(s) of the engine that is defective in material or workmanship or both.
Transportation charges on product submitted for repair or replacement under this warranty must be borne by purchaser. This warranty is effective
for and is subject to the time periods and conditions stated below. For warranty service, find the nearest Authorized Service Dealer in our
dealer locator map at www.briggsandstratton.com, or by calling (800) 233-3723, or as listed in the ‘Yellow Pages™’.
There is no other express warranty, implied warranties, including those of merchantability and fitness for a particular purpose, are
limited to one year from purchase, or to the extent permitted by law any and all implied warranties are excluded. Liability for incidental
or consequential damages are excluded to the extent exclusion is permitted by law. Some states or countries do not allow limitations on how
long an implied warranty lasts, and some states or countries do not allow the exclusion or limitation of incidental or consequential damages, so the
above limitation and exclusion may not apply to you. This warranty gives you specific legal rights and you may also have other rights which vary
from state to state and country to country.
LIMITED WARRANTY
WARRANTY TERMS **
Brand / Product Type Consumer Use Commercial Use
Vanguard   2 years 2 years
Extended Life Series 2 years 1 year
I/C, Intek I / C, Intek Pro 2 years 180 days
Kerosene Fuel Operated Engines 1 year 90 days
All Other Briggs & Stratton Engines 2 years 90 days
**Engines used on Home Standby Generator applications are warranted under consumer use only. This warranty does not
apply to engines on equipment used for prime power in place of a utility. Engines used in competitive racing or on
commercial or rental tracks are not warranted.
The warranty period begins on the date of purchase by the first retail consumer or commercial end user, and continues for the period of time stated in
the table above. “Consumer use” means personal residential household use by a retail consumer. “Commercial use” means all other uses, including
use for commercial, income producing or rental purposes. Once an engine has experienced commercial use, it shall thereafter be considered as a
commercial use engine for purposes of this warranty.
No warranty registration is necessary to obtain warranty on Briggs & Stratton Products. Save your proof of purchase
receipt. If you do not provide proof of the initial purchase date at the time warranty service is requested, the manufacturing
date of the product will be used to determine the warranty period.
ABOUT YOUR WARRANTY
Briggs & Stratton welcomes warranty repair and apologizes to you for being
inconvenienced. Any Authorized Service Dealer may perform warranty repairs. Most
warranty repairs are handled routinely, but sometimes requests for warranty service
may not be appropriate. For example, warranty would not apply if engine damage
occurred because of misuse, lack of routine maintenance, shipping, handling,
warehousing or improper installation. Similarly, warranty is void if the serial number
of the engine has been removed or the engine has been altered or modified.
If a customer differs with the decision of the Service Dealer, an investigation will be
made to determine whether the warranty applies. Ask the Service Dealer to submit
all supporting facts to his Distributor or the Factory for review. If the Distributor or the
Factory decides that the claim is justified, the customer will be fully reimbursed for
those items that are defective. To avoid misunderstanding which might occur
between the customer and the Dealer, listed below are some of the causes of
engine failure that the warranty does not cover.
Normal wear:
Engines, like all mechanical devices, need periodic parts service and replacement to
perform well. Warranty will not cover repair when normal use has exhausted the life
of a part or an engine.
Improper maintenance:
The life of an engine depends upon the conditions under which it operates, and the
care it receives. Some applications, such as tillers, pumps and rotary mowers, are
very often used in dusty or dirty conditions, which can cause what appears to be
premature wear. Such wear, when caused by dirt, dust, spark plug cleaning grit, or
other abrasive material that has entered the engine because of improper
maintenance, is not covered by warranty.
This warranty covers engine related defective material and / or workmanship
only, and not replacement or refund of the equipment to which the engine may
be mounted. Nor does the warranty extend to repairs required because of:
1Problems caused by parts that are not original Briggs & Stratton parts.
2 Equipment controls or installations that prevent starting, cause unsatisfactory
engine performance, or shorten engine life. (Contact equipment manufacturer.)
3 Leaking carburetors, clogged fuel pipes, sticking valves, or other damage,
caused by using contaminated or stale fuel. (Use clean, fresh, lead-free
gasoline and Briggs & Stratton Fuel Stabilizer, Part No. 5041.)4 Parts which are scored or broken because an engine was operated with
insufficient or contaminated lubricating oil, or an incorrect grade of lubricating oil
(check oil level daily or after every 8 hours of operation. Refill when necessary
and change at recommended intervals.) OIL GARD may not shut down running
engine. Engine damage may occur if oil level is not properly maintained. Read
Operating & Maintenance Instructions.
5 Repair or adjustment of associated parts or assemblies such as clutches,
transmissions, remote controls, etc., which are not manufactured by Briggs &
Stratton.
6 Damage or wear to parts caused by dirt, which entered the engine because of
improper air cleaner maintenance, re-assembly, or use of a non-original air
cleaner element or cartridge. (At recommended intervals, clean and re-oil the
Oil-Foam
 element or the foam pre-cleaner, and replace the cartridge.) Read
Operating & Maintenance Instructions.
7 Parts damaged by over-speeding, or overheating caused by grass, debris, or
dirt, which plugs or clogs the cooling fins, or flywheel area, or damage caused
by operating the engine in a confined area without sufficient ventilation. (Clean
fins on the cylinder, cylinder head and flywheel at recommended intervals.)
Read Operating & Maintenance Instructions.
8 Engine or equipment parts broken by excessive vibration caused by a loose
engine mounting, loose cutter blades, unbalanced blades or loose or
unbalanced impellers, improper attachment of equipment to engine crankshaft,
over-speeding or other abuse in operation.
9 A bent or broken crankshaft, caused by striking a solid object with the cutter
blade of a rotary lawn mower, or excessive v-belt tightness.
10 Routine tune-up or adjustment of the engine.
11 Engine or engine component failure, i.e., combustion chamber, valves, valve
seats, valve guides, or burned starter motor windings, caused by the use of
alternate fuels such as, liquified petroleum, natural gas, altered gasolines, etc.
Warranty service is available only through service dealers which have been
authorized by Briggs & Stratton Corporation. Your nearest Authorized Service
Dealer is listed in the “Yellow Pages
™” of your telephone directory under
“Engines, Gasoline” or “Gasoline Engines,” “Lawn Mowers,” or similar
category. 
						

							17
Emissions Control System Warranty Statement
Briggs & Stratton Corporation (B&S), the California Air Resources Board (CARB) and the
United States Environmental Protection Agency (U.S. EPA) Emissions Control System
Warranty Statement (Owner’s Defect Warranty Rights and Obligations)
California, United States and Canada Emissions Control Defects
Warranty Statement
The California Air Resources Board (CARB), U.S. EPA and B&S are
pleased to explain the Emissions Control System Warranty on your small
off-road engine (SORE). In California, new small off-road engines model
year 2006 and later must be designed, built and equipped to meet the
State’s stringent anti-smog standards. Elsewhere in the United States,
new non-road, spark-ignition engines certified for model year 1997 and
later must meet similar standards set forth by the U.S. EPA. B&S must
warrant the emissions control system on your engine for the periods of
time listed below, provided there has been no abuse, neglect or improper
maintenance of your small off-road engine.
Your emissions control system includes parts such as the carburetor, air
cleaner, ignition system, fuel line, muffler and catalytic converter. Also
included may be connectors and other emissions related assemblies.
Where a warrantable condition exists, B&S will repair your small off-road
engine at no cost to you including diagnosis, parts and labor.
Briggs & Stratton Emissions Control Defects Warranty Coverage
Small off-road engines are warranted relative to emissions control parts
defects for a period of two years, subject to provisions set forth below. If
any covered part on your engine is defective, the part will be repaired or
replaced by B&S.Owner’s Warranty Responsibilities
As the small off-road engine owner, you are responsible for the
performance of the required maintenance listed in your Operating and
Maintenance Instructions. B&S recommends that you retain all your
receipts covering maintenance on your small off-road engine, but B&S
cannot deny warranty solely for the lack of receipts or for your failure to
ensure the performance of all scheduled maintenance.
As the small off-road engine owner, you should however be aware that
B&S may deny you warranty coverage if your small off-road engine or a
part has failed due to abuse, neglect, improper maintenance or
unapproved modifications.
You are responsible for presenting your small off-road engine to an
Authorized B&S Service Dealer as soon as a problem exists. The
undisputed warranty repairs should be completed in a reasonable amount
of time, not to exceed 30 days.
If you have any questions regarding your warranty rights and
responsibilities, you should contact a B&S Service Representative at
(414) 259-5262.
The emissions warranty is a defects warranty. Defects are judged on
normal engine performance. The warranty is not related to an in-use
emissions test.
Briggs & Stratton Emissions Control Defects Warranty Provisions
The following are specific provisions relative to your Emissions Control Defects Warranty Coverage. It is in addition to the B&S engine warranty for
non-regulated engines found in the Operating and Maintenance Instructions.
1. Warranted Parts
Coverage under this warranty extends only to the parts listed below
(the emissions control systems parts) to the extent these parts were
present on the engine purchased.
a. Fuel Metering System
•Cold start enrichment system (soft choke)
•Carburetor and internal parts
•Fuel pump
•Fuel line, fuel line fittings, clamps
•Fuel tank, cap and tether
•Carbon canister
b. Air Induction System
•Air cleaner
•Intake manifold
•Purge and vent line
c. Ignition System
•Spark plug(s)
•Magneto ignition system
d. Catalyst System
•Catalytic converter
•Exhaust manifold
•Air injection system or pulse valve
e.Miscellaneous Items Used in Above Systems
•Vacuum, temperature, position, time sensitive valves and
switches
•Connectors and assemblies
2. Length of Coverage
B&S warrants to the initial owner and each subsequent purchaser
that the Warranted Parts shall be free from defects in materials and
workmanship which caused the failure of the Warranted Parts for a
period of two years from the date the engine is delivered to a retailpurchaser.
3. No Charge
Repair or replacement of any Warranted Part will be performed at no
charge to the owner, including diagnostic labor which leads to the
determination that a Warranted Part is defective, if the diagnostic
work is performed at an Authorized B&S Service Dealer. For
emissions warranty service contact your nearest Authorized B&S
Service Dealer as listed in the “Yellow Pages” under “Engines,
Gasoline,” “Gasoline Engines,” “Lawn Mowers,” or similar category.
4. Claims and Coverage Exclusions
Warranty claims shall be filed in accordance with the provisions of
the B&S Engine Warranty Policy. Warranty coverage shall be
excluded for failures of Warranted Parts which are not original B&S
parts or because of abuse, neglect or improper maintenance as set
forth in the B&S Engine Warranty Policy. B&S is not liable to cover
failures of Warranted Parts caused by the use of add-on,
non-original, or modified parts.
5. Maintenance
Any Warranted Part which is not scheduled for replacement as
required maintenance or which is scheduled only for regular
inspection to the effect of “repair or replace as necessary” shall be
warranted as to defects for the warranty period. Any Warranted Part
which is scheduled for replacement as required maintenance shall
be warranted as to defects only for the period of time up to the first
scheduled replacement for that part. Any replacement part that is
equivalent in performance and durability may be used in the
performance of any maintenance or repairs. The owner is
responsible for the performance of all required maintenance, as
defined in the B&S Operating and Maintenance Instructions.
6. Consequential Coverage
Coverage hereunder shall extend to the failure of any engine
components caused by the failure of any Warranted Part still under
warranty. 
						

							18 Look For Relevant Emissions Durability Period and 
Air Index Information On Your Engine Emissions Label
Engines that are certified to meet the California Air Resources Board
(CARB) Tier 2 Emissions Standard must display information regarding
the Emissions Durability Period and the Air Index. Briggs & Stratton
makes this information available to the consumer on our emissions
labels. The engine emissions label will indicate certification information.
The Emissions Durability Period describes the number of hours of
actual running time for which the engine is certified to be emissions
compliant, assuming proper maintenance in accordance with the
Operating & Maintenance Instructions. The following categories are used:
Moderate:
Engine is certified to be emissions compliant for 125 hours of actual
engine running time.
Intermediate:
Engine is certified to be emissions compliant for 250 hours of actual
engine running time.
Extended:
Engine is certified to be emissions compliant for 500 hours of actual
engine running time. For example, a typical walk-behind lawn mower is
used 20 to 25 hours per year. Therefore, the Emissions Durability
Period of an engine with an intermediate rating would equate to 10 to 12
years.
Certain Briggs & Stratton engines will be certified to meet the United
States Environmental Protection Agency (USEPA) Phase 2 emissions
standards. For Phase 2 certified engines, the Emissions Compliance
Period referred to on the Emissions Compliance label indicates the
number of operating hours for which the engine has been shown to meet
Federal emissions requirements.
For engines less than 225 cc displacement. 
Category C = 125 hours 
Category B = 250 hours 
Category A = 500 hours
For engines of 225 cc or more displacement.
Category C = 250 hours 
Category B = 500 hours 
Category A = 1000 hours
Briggs & Stratton Engines Are Made Under One Or More Of The Following Patents: Design D-247,177 (Other Patents Pending)
6,691,683
6,647,942
6,622,683
6,615,787
6,617,725
6,603,227
6,595,897
6,595,176
6,584,964
6,557,833
6,542,0746,520,141
6,495,267
6,494,175
6,472,790
6,460,502
6,456,515
6,382,166
6,369,532
6,356,003
6,349,688
6,347,6146,325,036
6,311,663
6,284,123
6,263,852
6,260,529
6,242,828
6,239,709
6,237,555
6,230,678
6,213,083
6,202,6166,145,487
6,142,257
6,135,426
6,116,212
6,105,548
6,347,614
6,082,323
6,077,063
6,064,027
6,040,767
6,014,8086,012,420
5,992,367
5,904,124
5,894,715
5,887,678
5,852,951
5,843,345
5,823,153
5,819,513
5,813,384
5,809,9585,803,035
5,765,713
5,732,555
5,645,025
5,642,701
5,628,352
5,619,845
5,606,948
5,606,851
5,605,130
5,497,6795,548,955
5,546,901
5,445,014
5,503,125
5,501,203
5,497,679
5,320,795
5,301,643
5,271,363
5,269,713
5,265,7005,243,878
5,235,943
5,234,038
5,228,487
5,197,426
5,197,425
5,197,422
5,191,864
5,188,069
5,186,142
5,150,6745,138,996
5,086,890
5,070,829
5,058,544
5,040,644
5,009,208
4,996,956
4,977,879
4,977,877
4,971,219
4,895,1194,875,448
4,819,593
4,720,638
4,719,682
4,633,556
4,630,498
4,522,080
4,520,288
4,512,499
4,453,507
4,430,984D 476,629
D 457,891
D 368,187
D 375,963
D 309,457
D 372,871
D 361,771
D 356,951
D 309,457
D 308,872
D 308,871