Briggs & Stratton 28N700 Series Operating manual

Operating
& Maintenance
lnstructions
Model
Series
Covered
in
ThisManual
28N700
287700
28P700
28Q700
285700
28U700
310700
311700
312700
313700
Model
Note:
Cleneral
lVlcdel
Series
numbersnotedaboveincludemanyspecificnumbers
like
theonesonyourengine.
To
getreplacement pafisortechnicalassistance
in
thefuture,write
yourengineModel,Type,Codeanddateof purchase
here.
TABLE
OFCONTENTS
Safety 3-5
Engine
Information ...... 6
oir
. ...... 7
Fuel
andStafting
Information ....... .. B
StartingandStopping.
.. .... 9-10
Maintenance... 11-13
Adjustments
... ........ 14
Parts
andService& Storage 15-16
WarrantvInformation ... 17
I wnnNrNG
Briggs& Strattondoes
notapproveor authorize
theuseof
theseengineson3-wheel
AllTerrain
Vehicles
(ATVs),
motor
bikes.aircraftoroducts
or vehiclesintendedfor use in
competitive
events.Useof
theseengines
in
suchapplications
couldresultin property
damage,
seriousinjury
(including
paralysis),
oreven
death.
PRiNTED
IN
U,S.A. O Copyright
2000
by
Briggs&StrattonCorporation FORMNO.274789-7lOO

ThePower
InPower
EquipmentrM
Thank
you
forselecting
a Briggs &Strattonengineto
power
your
equipment.
Briggs
&Stratton
is
committedtoproducing
aline
ofengineswhichwillmake
your
life's
choreseasierto
pedorm.
Wehave,
atthe
sametime,improvedthe
designofour
enginessotheyare
environmentally
friendly.
Since
1995,
wehave
succeeded
inreducing
smog-forming
exhaustemissionsfrom
ourenginesby70"k.Briggs
&Stratton'sefforts
have
not
stoppedthere.
We
arealso
committedtodesigning
and
introducing
evencleanerenginesinthefuture,whilemaintaining
ourreputationfor
excellentutilityandvalue.
Briggs
&Stratton'senvironmental
awarenesshasresulted
inthe
engineeringofthe
"Smart-Fill@"
gas
can,
featuring
aspill
resistant
nozzlewhich
opens
only
when
fullyinserted
intothe
gas
tank,and
which
shutsoff
automatically
when
thetankis
full.Because
refueling
spillscanharm
theenvironment,
the
Smad-Fill@container
helps
preserve
astrongerecosystem
by
reducing
lhissource
of
pollution.
Wehope
you
will
enjoy
your
new
engineandequipment.
Wewelcome
you
to
our
worldwidefamily
ofBriggs
& Stratton
engrneusers.
BestWishes
Always,
The
Employees
ofBriggs & Stratton
Corporation
Look
ForRelevant
Emissions
DurabilityPeriod
and
AirIndex
Information
On
Your
EngineEmissions
Label
Engines
that
arecertifiedto meettheCaliforniaAirResources
Board
(CARB)
Tier2 Emission
Standardsmust
display
information
regarding
theEmissionsDurabilityPeriod
andtheAirIndex.Briggs
&Stratton
makes
thisinformation
available
totheconsumer
onouremissionlabels.
TheEmissions
Durability
Period
describesthenumber
of
hours
ofactual
running
timeforwhichthe
engineiscertifiedto
beemissions
compliant,assuming
proper
maintenance
in
accordance
with
theOperating& MaintenanceInstructions.
The
following
categoriesare
used:
Moderate:
Intermediate:
Extended:
Engineis
certified
tobeemission
compliantfor125hours
ofactualenginerunningtime.
Engineis
certifiedtobe
emissioncompliantfor250hours
ofactualenginerunning
time
Engineis
certifiedto
beemission
compliant
for
500hoursofactual
engine
running
time.
For
example,
atypical'walk-behind lawnmower
is
used20to25 hours
peryear.
Therefore,
theEmissionsDurability
Period
ofanenginewith
anintermediate rating
would
equateto 10 to 12
years.
The
Air Index
isacalculatednumber
describingtherelative
level
ofemissions
for
aspecificenginefamily.Thelower
the
Air Index,
thecleanerthe
engine.Thisinformation
is
displayed
in
graphical
form
on
the
emissionslabel.
After
July
1,
2000,Look
ForEmissions
Compliance
Period
On
Engine
Emissions
Compliance
Label
After
July1,2000
certainBriggs
& Strattonengines
willbe
cerlified
tomeet
theUnitedStatesEnvironmentalProtection
Agency
(USEPA)
Phase
2emissionstandards.ForPhase
2certifiedengines,theEmissions
Compliance
Period
referred
to
ontheEmissions
Compliancelabel
indicatesthenumber
ofoperating
hoursforwhich
theenginehas
beenshown
to
meet
Federal
emissionrequirements.
For
engines
less
than225
ccdisplacement,Category
C= 125hours, B
=250
hours
andA=500 hours.
Forenginesot225
ccor
more,
Category
C=250 hours, B=500hours
and
A='1000 hours.
Thedisplacement
of
ModelSeries
280000
enginesis465
cc.
The
displacement
of
Modelseries
310000engines
is
501
cc.
This
is
a
generic
representation
of
the
emissionlabel
typically
found
onacertified
engine.

[, wnnNrNG
WHEN
ADDING
FUEL
o
TurnengineOFF
andletengine
coolat least
2
minutesbefore
removing
gas
cap"
. Fill
fueltankoutdoors
or
inwell-ventilated
area.
. Do
not
overfill
fueltank.
Filltanktoapproximately
1-112inchesbelow
topof neckto allow
forfuel
exoansron.
. Keep
gasoline
away
fromsparks,
open
flames,
pilot
lights,
heat,andother
ignitionsources.
. Check
fuellines,tank,
cap,and
fittings
frequently
for
cracks
orleaks.
Replace
ifnecessarv.
WHENSTARTING
ENGINE
. Makesure
spark
plug,
muffler,fuelcapandair
cleanerare
in
place.
. Donotcrank
engine
withspark
plug
removed.
. lf
fuel
spills,
waituntil
itevaporates
before
stafiing
engrne.
. lf
engine
floods,set
choke
toOPEN/RUN
position,
place
throttle
inFASTand
crankuntil
engine
stads.
WHEN
OPERATING
EQUIPMENT
r Do nottip engine
or equipment
at angle
which
causes
gasoline
tospill.
. Do
not
choke
carburetor
tostop
engine.
WHEN
TRANSPORTING
EQUIPMENT
. Transoort
withfueltank
EMPTYor
with
fuel
shut-off
valveOFF.
WHEN STORING
GASOLINE
OR EQUIPMENT
WITH FUEL IN
TANK
. Store
away
from
furnaces,stoves,
water
heatersor
otherappliances
that havepilot
lightor other
ignitionsourcebecause
they
can
ignite
gasoline
vaoors.
[, wanNrNG
ru>u
E
BEFORE PERFORMING
ADJUSTMENTS
OR
REPAIRS
. Disconnect
spark
plug
wireand
keepitaway
from
spark
plug.
. Disconnect
batteryat negative
terminal (only
engines
withelectric
start).
WHEN TESTING
FOR SPARK
. Useapproved
spark
plug
tester.
o
Do
notcheck
forspark
withspark
plug
removed.
1[, wnnNrNG
r lfthere
isnatural
orLP
gas
leakage
in
area,
do
not
start
engine.
. Do not use pressurized
starling
fluidsbecause
vaoors
are
flammable.

SAFETY
I wnnNrNG
. Startandrun
engine
outdoors.
. Donot
start
orrun enginein
enclosed
area,evenif
doors
orwindows
areooen.
[, wnnNrNG
tr
. Operate
equipmentwith
guards
in
place.
o
Keep
handsandfeet
awayfromrotating
parts.
r Tie
up
long
hair
and
remove
jewelry.
. Do not wear loose-fitting
clothing,
dangling
drawstringsoritems
thatcould
become
caught.
1ff,
wnnNtNG
JV
tsllllllllr
.Allow muffler,'engine
cylinder
and finsto cool
beforetouching.
. Remove
accumulated
combustibles
frommuffler
area
andcylinder
area.
r Install
and maintain
in working
ordera spark
arrester
before
usingequipment
onforest-covered,
grass-covered,
brush-covered
unimprovedland.
The
state
ofCaliforniarequires
this
(Section
4442
oftheCaliforniaPublic
Resources
Code).
Other
statesmay
have
similarlaws.Federal
laws
apply
onfederal
land.
I wnnNrNG
a\r,
. When staftingengine,
pull cord slowly until
resistanceisfelt,
then
pull
rapidly.
. Remove all external
equipmenVengine
loads
beforestarting
engine.
. Direct
coupled
equipmentcomponents
such
as,
but not limitedto, blades,impellors, pulleys,
sprockets,etc.,must
besecurely
attached.

ENGINE
PARTS
Oildrain
Oilfill/Dipstick
Rotatingscreen
Blowerhousing
1.
2.
3.
4.
5.
6.
Muffler/(Muffler
guard,
ifequipped)/
(Spark
arrester,
if
equipped)
12
Velectricstarter
L
9.
10.
11.
12.
Aircleaner
In-line
fuelfilter
(if
equipped)
Carburetor
Oil
filter
(if
equipped)
Spark
plug
wire
Engine Model
XXXXX Type
XXXXXX Code
XXXXXXXX
GENERAL INFORMATION
ENGINEMODEL
Thisisasinglecylinder,overhead
valve
(OHV),
air-cooled
engine.
ltis
a lowemissionsengine.
InthestateofCalifornia,
OHV
Model
Series
280000and
310000
enginesarecertified
by the California
Air Re-
sources
Boardtomeetemissionsstandards
for
250hours.
Such
certificationdoes.not
grant
thepurchaser,
owneror
operator
of this engineany additional
warrantieswith
respecttothe
perlormance
oroperational
life
of
thisengine.
This
engine
is
warranted
solely
according
to
the
product
andemissions
warrantiesstatedelsewhere
inthis
manual.
MODEL SERIES
28OOOO
Bore. .3-7/16
in.
(87.31
mm)
Stroke 3-1/16
in.
(77
.78mm)
Disolacement
.... 28.42 cu.
in.
(465.7
cc)
MODELSERIES31OOOO
Bore. . 3-9/16
in.
(90.60
mm)
Stroke 3-1116
in.
(77
.78mm)
Disolacement.
... 30.59 cu.
in.
(501.2
cc)
Note:For
practical
operation,
thehorsepower
loadingshould
not
exceed85%
of ratedhorsepower.Engine
power
will
de-
crease3-1/2"/"
foreach
1,000feet
(300
meters)abovesea
leveland
1"ktoreach10'F (5.6'C) above
77"F (25" C).
Engine
will
operate
satisfactorilyatanangleup
to15'.
TUNE.UPSPECIFICATIONS
Armatureair
gap ... 0.010
- 0.014
in.
(0.25
- 0.36
mm)
Spark
pluggap 0.030
in.
(0.76
mm)
Valveclearance
with
valve
springs
installed
and
piston
1/4in.
(6
mm)
past
topdeadcenter
(check
whenengine
is
cold).
See
Repair
Manual
PlN272147or
274008.
lntake 0.003
- 0.005
in.
(0.08
- 0.'13
mm)
Exhaust ..... 0.005-0.007
in.
(0.13-0.18
mm)
THEINTERNATIONAL
SYMBOLS
USED
ONTHEENGINE
OR
INTHISMANUAL
INCLUDE:
A
Safety
Alert
[g
On Off
N]
Fuel
Shutoff
Read
Owner's
Manual
@
Stop
T
Fuel
v,
oil
lrl
Choke

274789
OIL CAPACITY
Enginewithout
oil
filter
holds
approximately1-1l2
quarts
(48
ounces;1.4
liters).Engine
equippedwith
oilfilterholds
approximately
1-3/4
quarts
(56
ounces;1.7liters).
TYPE OF OIL TO USE
. Usea high
quality
detergent
oilclassified
"For
Service
SF,
SG,SH,SJ"
orhigher,
suchas Briggs
& Stratton
30W,PartNumber
100005
(20
oz\or100028
(48oz\.
o
Donot
usespecialadditives.
. Chooseaviscosity
according
tothetable
opposite.
. CAUTION:
Air cooled enginesrun hotter
than
automotiveengines.The use of non-synthetic
multi-viscosity
oils (5W-30, 10W-30, etc.) in
temperatures
above
40"F(4'C) willresult
inhigher
than normal oil consumption.When using a
mulli-viscosity
oil,check
oil
level
morefrequently.
.. CAUTION:SAE
30oil,
if
usedbelow40"F
(4"
C),will
resultin hard starting
and possible
engine
bore
damage
duetoinadequatelubrication.
SAEViscositv Grades
-a ffi
'c 24. 2A 32 10 60 80 100
c -30 2A 10 0]U 2A 30
STARTING
TEN,4PERATUBE
F]ANGEANT
CIPATEDBEFOFENEXT
OILCHANGE
Note:
Synthetic
oilmeetingILSAC
GF-2,API
certificationmark and API service
symbol
(shown
at left)with
"SJ/CF
ENERGY
COt\-
SERVING"
or
higher,
is
anacceptable
oilatall
temperatures.
Useof syntheticoil doesnot
alterrequired
oilchangeintervals.
CHECKINGAND
ADDING
OIL
. Check
oil
level
before
startingthe
engine.
. Check
level
daily,
orafter
everyeight
(8)
hours.
t1l Place
enginelevel
and
clean
aroundoilfill
area. t2l Remove dipstick and
wipe
cleanwith
cloth.
tsl lfneeded,
addoilslowly
-
recheck.
Donot
overfill.
t31 Replace
and
tightendip-
stick.Remove
and
check
oillevel.
Replace
andtighten
dip-
stick.
o
Keep
oil
level
at
FULL.
o
Donot
overfill.
14) Oil level should be at
FULLline
ondiostick.

TYPE OF FUELTO USE
. Use clean,
fresh,regularunleaded
gasoline
with a
minimum
of 85 octane.
Fresh
fuel
preventsgumfrom
forming
in
the
fuel
system
oronessential
carburetor
pafts.
Purchasefuel
in
quantity
thatcanbe
used
within30days.
. Donotuse
gasoline
whichcontains
Methanol.
. Do
notmixoilwith
gasoline.
. For
engine
protection
useBriggs& StrattonGasoline
Additiveavailable
from your Authorized
Briggs &
Stratton
Dealer
(P/N
5041orsingle
use
pouch).
r Thisengine
is
certified
tooperate
on
gasoline.
Exhaust
Emission
Control
System:
EM
(Engine
Modifications).
CAUTION:
Some
fuels,called
oxygenatedor
reformu-
lated
gasoline,
are
gasoline
blended
withalcoholsor
ethers.
Excessive
amounts
of
theseblendscandamage
the
fuelsystem
orcause
performance
problems.
lfany
undesirable
operating
symptoms
occur,use
gasoline
with
a lower
percentaqe
ofalcohol
orether.
ADDING
FUEL
Fillfueltankoutdoors
or in well-ventilatedarea,
away
from
sparks,
open
flames,
pilot
lights,heat,
andother
ignitionsources.
lffuelspills,
wait
until
itevaporates
beforestarting
engrne.
TurnengineOFFand letenginecool
at least2
minutesbefore
removing
gas
cap.
Removecap.
Filltanktoapproximately
1-112inches
below
topof neckto allow
forfuel
expansion.
Be
careful
nottooverfill.
Briggs& Stratton
Smart'fill' fuel can fillsto the
correct
levelandautomatically
shutsoff,
reducing
soillsand
emissions.
Replacecap
beforestarting.
A wnnrulr'rc
{l{nt t4l
t1l
t2l
t3l t5l
STARTING
I wnnNrNG
. Donotuse
pressurized
stafting
fluids.
. Vaoorsareflammable.
OIL
PRESSURE
SWITCH
lfengine
isequipped
withan
oil
pressure
switch,theswitch
willeitheractivate
awarning
lightorstop
theengine
when
theengine
runs
lowonoil.
(Read
theoperating
instructions
supplied
by the equipment
manufacturer
to determine
whichway
your
engine
is
equipped
because
theequipment
manufacturersupplies
theoil
pressuregauge.)
SeeOIL
PRESSURE
on
page
'12
foroil
filling
instructions.
STARTING
AND
OPERATING
TIPS
r Store
and
fuel
equipment
inlevel
position.
oUse
fresh
fuel.
(See
Fuel.)
oUse correcttype of oil for expected
starting
temperature.
(See
Oil.)
r Remove external
equipmenVengine
loads.
(See
equipmentoperating
instructions.)
r Start
lawnmoweronhardsurfaceorover
previously
cut
grass.
r Periodically
remove
grass
buildup
under
mower
deck.
(See
Maintenance.)
o
Afterengine
hasslarted,
let it warmup several
seconds
toseveral
minutes,depending
onoutside
temperature.
r For
maximum
performance
and
life,operateengine
withchoke
inRUNandthrottle
inFAST.

REWIND(MANUAL)
STARTER
(auxitiary)
TO
START
ENGINE
t1l Check
oillevel
(see
p.7).
tzl Openfuel
shut-off
valve
(if
equipped)
1/4
turn.
STARTING
AND
STOPPING
ART
Choke/throttle
control
I4l lf choke
and
throttle
are
on the same control,
move
control
toCHOKE
orSTART
l7l Let engine warm up.
Choke
Equipped:
Move
choke control off or
toward
FAST
a short
dis-
tance
atatime
over
sev-
eral seconds
in warm
weather
or minutes
in
coldweather.
Let
engine
run
smoothly
before
each
change. Operate with
throttle
inFAST.
- ._.o!
,z---\Ne" v
//4,
KW) srARr
V/
tsl Insert
keyand turnto
RUN.
TO
STOP
ENGINE
I
IE.s
Z-*$"
@START
t1l With
throttle
inFAST,
turn
key
to
OFF.
Remove
key
and
store
out
ofreach
of
children.
1/4TURN
I2l Closefuel
shut-off
valve
(if
equipped).
FAST
An 11
-'ll'i
^lfll *
K )TI SLOW
\/Ll
17\
llft,\ffii, \
rreN
\
Choke I Throttle
t3l lf choke
andthrottle
con-
trols
areseparate,
move
choke
controlto
CHOKE.
Move
throttle
to FAST.
[, wnnNrNG
'\*
i6l Grasprope
handle.
Pull
slowly
untilresistance
is
felt,
then
pull
rapidly
to
stan engineand avoid
kickback.

STARTING
AND
STOPPING
v
I
-,'
SLOW
l2l lf choke
andthrottle
con-
trols
are separate,
move
chokecontrol
toCHOKE.
Movethrottle
to FAST.
,o).r^'',
| | Rr\-====v\
tt(uq\\
\)/ \z\il
\
Choke
ELECTRIC
(KEY)
STARTER
(if
equipped)
TOSTART
ENGINE
t1l Check
oil
level.
Choke/throttle
control
t3l lfchokeand
throttleare
on the same control,
move
control
toCHOKE
orSTART
t6l Let engrne
warm uP.
Choke
Equipped:
Move
choke control off or
tow'ard
FAST
ashortdis-
lance
alaltmeover
sev-
era!seconds
ln warm
weatheror minutesin
cold
weatherLetengine
run smoothly before
each change.
Operate
wrththrottle
rnFAST.
I
I
t4l Open
fuelshut-off
valve
(if
equipped)
1/4turn. tsl Insert
keyand
turn
to
START.
CAUTION:
To prolong starter
life,use short
starting
cycles
(5
seconds
maximum,
then
walt
one
minute).
Followequipment
manufacturer's
recommendations
forcharging
battery.
Close
fuel shut-off
valve
(if
equipped).
TO
STOP
ENGINE
FAST
v
I
tf
SLOW
t1l Withthrottle
inFAST,turn
keytoOFF.
Remove
kevandstore
outofreachofchildren.
E.sl
z-.t-
@ START
10

MAINTENANCE
t
I
I
MAINTENANCE
Regularmaintenance
willimprove
theperformance
and
extendthelife
of
the
engine.SeeanyAuthorizedBriggs
&
Stratton
Dealerfor
service.
Useonly genuine Briggs
&
Stratton
parts.Otherparts may not performas well.
may damagethe engine.and may result in injury.In
addition,
useofother
parts
mayvoid
your
warranty.
EMISSION
CONTROL
Maintenance,replacementor repairof the emission
control devicesand systemsmaybeperformed
by any
nonroad engine repair
establishmentor individual.
However,toobtain no
charge
repairs
undertheterms
and
provisions
of
theBriggs&Stratton warranty
statement,
any
serviceoremissioncontrol
part
repair
orreplacement must
be
performed
byafactory authorized
dealer.
Followthe instructions
and
schedulesindicated
below.
/ Task
Performtask
at hourly
orcalendarinterval,
whichever
comesfirst.
CheckOilLevel {
Change
Oil {.
Changeoilfilter
(if
equipped) ,/-
Serviceair
cleaner
pre-cleaner
(if
equipped) {**
Service
aircleanercar-
tridge
(if
not
equipped
with
pre-cleaner) {.
Serviceair
cleanercar-
tridge
(if
equipped
with
pre-cleaner) ,/.
Inspect
sparkarrester
(if
equipped) .{
Replace
spark
plug {
Replace
in-linefuelfilter
(if
equipped) J
Cleancooling
system ./..
Checkvalve
clearance {
V, CHANGTNGOtL
Change
oilafterfirst
5to8 hours of use,then
every
50hours orevery
season.Change
oilevery25hours
when
operating
theengineunderheavyload
orinhigh
temoeratures.
Cleanmore
oftenunder
dustvconditions
or when
airbornedebrisis
present.
Replhce
aircleaner
pafts,
if
very
dir1y.
@@
5/16' HEX 3/8"SQUARE
@
7t16"PIPE
Typical
drain
plugs
Place
engine
level.
Disconnect
spark plug
wiresandkeep
awayfrom
spark
plugs.
Disconnect
battery
(if equippedwith
electricstarter)
at nega-
tiveterminal.
t3l WithengineOFFbutstillwarmremove
oildrain
plug
anddrainoilintoappropriatereceptacle.
l4l Reinstalldrain
plug.
Remove
dipstick.
t5l FilltoFULLmark
ondipstickwithnew
oil.
Do not overfill.
Note:Enginewithout
oil
filterholds
approximately1-112
quans(48
ounces;1.4liters).Engine
equippedwithfilter
holdsapproximately1-3/4
quafts
(56
ounces;
1.7
liters).
t6l Replace
dipstick.
OILDRAIN
PLUG TOREMOVE
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