Saito FG-57TS User manual

-1-
SAITOFG-57TSistheupdatedmodelexclusivelyforAcrobaticflightbasedonFG-57Twhichhasbeengottengoodreputations
frommanyscaleflyers.Thestandardequipmentssuchasstand-offmountandheatsinkmakeinstallationeasierandbringit
durabilityagainstheatduringyouractiveflight.Ofcourse,itsreliabilityandbeautifultwinsoundhavebeentakenfromFG-57T.
Specifications
Bore 36.0mmx2
Body:2,090g/Muffler:90g/Ignitionsystem:170gEnginemount:80g(20gx4)
Stroke 28.0mmx2 57.0cc
Disp.
Weight
Practicalspeed Approx.1,500-7,000rpm
D21”x23“~P10”x11”
MaxonGnd Approx.6,000~7,000rpm
Gas-engine50ccclass
Propeller Staticthrust Approx.6~8kgf(Dependonprop)
Applications
Fuel
Fuelconsumption
Batteryforignitionsystem
Standardaccessories
Enginemountset(Stand-off35mm) 4pcs
Ignitionsystem(w/sensor) 1set
Sparkplug[NGKCM-6](Attachedtoengine) 2pcs
Mufflerset(2Flexiblemufflers&Bracket) 1set
Carburetoradjustmentbar 1pc
Chokebar 1pc
Aluminumpropwasher(w/steelwasher)1set
Limitgauge(0.1t)fortappetadjustment1pc
Spannerfortappetadjustinglocknut 1pc
Hexagonalwrenchset 1set
Plugwrench 1pc
Anti-looseningnut 1pc
Regulargasoline:Oil=20:1(Volumeratio)
Approx.35cc/min(Atfullthrottle6,500rpm)
*Fuelflowvariesdependsuponpropload.Morefuelflowwithlargerloadandlessfuelflowwithsmallerload.
Voltage:6-9Vhigherthan1,000mAisrecommended
SAITO FG-57TS
4-Stroke Gasoline twin Engine Operating instructions
ThanksforbuyingSAITOFG-57TS4-strokegas-engine
exclusivelyformodelairplanes.
Inordertoavoidmisuse,pleasebesuretoreadwellthisinstruc-
tionmanualcarefully.Ifthereshouldbeanydeficiency,inconve-
nience,etc.concerningthemanufacture,ourcompanywill
repairthemwithresponsibility.
Anyfailureortroublecausedbyunnecessarydisassembly,
modification,orotherusesthanthoseprovidedintheinstruc-
tionmanualisnotsubjecttothewarranty,however.
Moreover,allresponsibilitiesfortheuseoftheengine,andother
obligationsandresponsibilitiesbasedonlaws,regulations,etc.
arebornebythepurchaserandtheuser,and
SAITOSEISAKUSHOCO.,LTD.isexemptfromanyresponsibilities.
Notificationabouttreatmentof4-strokemodelgas-engine
◎Sincevalvetimingisdesignedtogethighpowerandhighspeed,theoverlaprangeisrelativelywide.Sosometimesfuelgetflown
backfromthecarburetor.(Itmayspatterintheengineroom.)
◎Sincetheoilforlubricationismixedinthefuel,wasteoilfromthebreathernippleisdirty.Dependingontreatmentofwasteoil,it
canbespatteredontheplane.(Ref.chapter9)
◎
Sincelubricationisthroughbreather,sometimestheoiloozesfromeachjointorcommissurehoweveritʼsnoproblemonperformance.
◎Dependingonthequalityoftheoil,sometimestherecanberustinsidethecrankcase.Butitʼsnoproblemonperformanceaslong
astherearenoabnormalnoiseorbacklash.
1.Propeller
Dependingontheairframe,pleaseadoptthestandardsizein
thedataanduseareliableproductwhichisgenerallyonthe
market.(Carbonpropisrecommended)
Sincealarge-diameterpropisused,pleasemaintainsufficient
balance.Sinceanimbalancedpropisvibratoryanddangerous
withloweredperformance,pleasemaintainbalancewitha
balancer.Moreover,acrackedpropisdangerous.Makesureto
checkanytimeandreplaceitwithanewoneifitʼscracked.
*Propandfuelconsumption
Iftheloadislarge(thediameter&pitchofthepropislarge)forthe
enginecharacteristics,theair-fuelmixtureshouldberich.Thusthe
mainneedlehastobeopened.Thatis,eveniftherevolutionislow,
thefuelconsumptionishigh.Conversely,whentheloadissmalland
therevolutionishigh,thefuelconsumptionisloweredbecausethe
mainneedlecanbeclosed.
Inordertodecreasethefuelconsumptionandprolongtheenginelife,
apropellershouldbeusedwhoserevolutionismaximizedwhenthe
throttle-valveisfullyopened,whileusinganairframewhichenables
allflightswithabout90%oftheoutputofthepropeller.Inthiscase,
thethrottlevalvewillbefurtherthrottledduringhorizontalflight.On
thecontrary,anairframewhichcanonlydeliverperformanceinfully
openconditionwillsufferworseningfuelconsumptionandlife.
Fig.1
Outsidedimensions
60
4-
Ø
5.2
Ø
10
32.2 6
(85)
66
60
53
103
E.C
83 68.5
49.5
34
M10x1.25
103
E.C
78
(97)
96 38
159 217 3

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Gasoline-prooftube
(Option)
(Option)
Filterwithweight
Gasoline-proof
Pump
Fig.2
2.Fuel
Thefuelismixtureofcommercialregulargasolineandreliableoilfor2-stroke.(Unleadedhigh-octanegasolineisnot
necessarilyrequiredforSAITOengine.)
[Exampleofoil]
・POWERLUBE(KLOTZORIGINALTECHNIPLATE)
・KLOTZGSRCmodelLUBE
・CASTROLPOWER1TTSRacing,etc.
Forthemixtureratio,pleasebesuretouse“gasoline:oil=20:1”orricherbyvolumeratio.
(ex.1000mlofgasolineshouldbemixedwithmorethan50mlofoil).
Anydamagecausedbythefuelused,inwhichtheoilratioislowerthan20:1ratio,isnotwarranted.
Sincegasolineisdangerousmaterial,becarefulofitsstorage,use,andtransportenough.(Theevaporativeemissionand
exhaustsmokeofgasolinehaveaharmfuleffectonahumanbody.Also,ifgasolineisleaked,thereisdangeroffireetc.)
Pleasenotethatwetakenoresponsibilityforaccidents,healthdamages,etcwhichoccurduringstorage,useandtransportof
gasoline.
3.FuelFilterandfuelpump
Sincecommercialgasolinehasmanyimpurities,pleasebesuretouseareliablefilter
fortheadmissionportofthegasoline-prooffuelpump(Fig.2),andinthefueltankas
well(Fig.3).Withoutusingafilter,theperformanceofthecarburetorisnotdelivered,
resultinginfailures.
Usingoptionalpart“Filterwithweight”ishighlyrecommended.
4.Fueltankandpiping
Fuellevel
above
Fuellevel
toOutsideof
thefuselage
Fig.4
Airinhalationpipe
Fig.3 Centeroffueltank
Closeaspossible
Firewall
Stand-offmount
Fueltank(500~600cc)
Gasoline-prooftube
Filterwithweight
Airinhalation
pipe
Fuelfeedingpipe
toCarbnipple
Rubbercapforgasoline-resistant
Hollowoutreferringto
thecuttingsheet
Forthecapacity(about500cc-600cc),refertothedataandselectthebestofcommercialproduct.Pleasebesuretouseafilter
withweight.Toavoidentrainanyimpuritiestothecarb,pipingwith“Fuelfeedingpipe”and“Airinhalationpipe”(Fig.3)is
recommended.
*Pleasebesuretouse“gasoline-proof”productsforthetanklidrubber,piping,andtubing.Someoftheproductsforglowfuel
canʼtbeusedforgasoline.Pleasecheckcarefullyifthereʼreanycrackonthepiping,tubing,connection,andtank.
AlloftheconnectionpartsshouldbeboundbythinNylonstraporwiretoavoidfuelleakageorairinductiontothefuelline.(If
thereareanyleakages,theperformanceoftheenginedecreasesdramatically.)
*Whenperforminganacrobatwithalargechangeinfuellevelorthatrequiringanexcessivemovementofthrottle,thetank
mustbeplacedatapositionclosetotheengineasmuchaspossible.
*Whenprovide“Airinhalationpipe”asFig.3,arrangingthetubeabovethefuellevel(Fig.4)istheeffectivewayoffuelleakage
prevention.
*ThecarburetorofFG-57TScomesoutfromthebackofthefirewall.Sometimesfuelgetflownbackfromcarburetorandmay
spatterinsidethefirewall.Forthatcase,makesuretocoverthebatteries,R/Cequipmentsandallthefoammemberswith
gasoline-proofmaterial.
5.Sparkplug
NGKCM-6sparkplugisthestandardequipment.Dimensionsareasfollows;
Hexagonwidth:14mm Screwsize:10mm Reach:8.5mm Spark-gap:0.7-0.8mm
Forreplacement,pleasereplacewithareliableproductasNGKCM-6.
SinceSAITO4-strokeengineusesmixedgasoline,pleasedecidethenumbersofflightsbyyourselftocleanthesparkplug.
Pleasereplace,whenitisdegraded.(Considertheplugasconsumable.)
6.Ignitionsystem
*Becarefulofpossibilityofelectricalshockasitgenerateshighvoltage.
*Theunitincludesaplasticcliptoholdtheconnectorsandspiraltubetoprotecteachwire.
TheignitionsystemisdesignedtomatchSAITO4-strokegas-engineswithautomaticadvancingsystem.
Howeverthisignitionsystemisdesignedtobeananti-noiseproduct,pleaseisolateitcompletelyfromthereceiver,servo,and
batterytoavoidaradio-interferencetrouble.Moreover,itisdesirabletoutilizeanoisefilter(linefilter).Especially,eachswitch
(forIgnitionandforReceiver)shouldbeisolatedandsetfarfromeachones.
Caution:Agas-enginegeneratesanoisewhichhasanadverseeffectonRCadjustment.Pleasebesuretocarryoutanoise
checkeachtimewhiletheengineisrunningbeforeflight.Sinceanoisewhichoccursduringflightmayleadtoalarge-scale
accident,pleasecarryoutanoisecheckwithoutfail.Asasimplemethod,afterstartingengineyoucancheckbyremoving
theantennaofthetransmitterandoperateitabout50mawayfromtheairplane.Ifthereisnomalfunction,itisnormal.

-3-
Thefunctionofeachcord;
(1)Plugcord(meshedhightensioncord)
AsFig.5showstherearetwocordsavailablefortwocylinders.Whenyouputontheplugcap,insertittothepluguntilyou
canhearclickysoundtoavoidcomingoffduringflight.Andthenpulltheplugcaptomakesurethatitwonʼtcomeoff.
(2)Sensorcord(black/red/whitecord)
Connectwiththecordfromthesensorattachedtotheengine.
(3)Batterycord(black/redcord)
Pleaseusethefullychargedbatterythathasadequatespec.(6-9V,morethan1000mAisrecommended.).Betweenthe
batteryandmainunit,makesuretosetanignitionswitchwhosecapacityishigherthan3A.
Fig.5Ignitionsystem
(FG57T-153A)
Recommended battery
5cell-NiMH
2cell-LiPo
Voltage:6-9V
Capacity: 1,000mA 以上
Switch (not included)
Capacity: more than 3A
Plug cap
Plug cord
Main unit
Battery cord
Sensor cord
Sensor
Fig.6 Neutral
Position
Hand start
easy
area
Delay
Spark
timing
Advance
Spark
timing
CCW
CW
Prop
rotation
(CCW)
View
from
front
7.SensorpositionandPower/Startingeasiness;
TheignitionsensorcanbemovedtoCW(advancethesparktiming)orCCW(delaythetiming)asFig.6shows.
Atthefactorydefaultthesensorisfixedonthecenter(neutral)position.Thereasonisrelatedtothemethodsofenginestarting.
・Withanelectricstarter-Youcanstartwhereverthesensorisfixed.
Soyoucansetthesensorastherpmreachesmaximumspeed.
・Byhandflip(Manualstart)-Startingeasinessdependsonthesensorposition.
Thefactorydefaultissetasyoucanstartbyhandflipandalsogethighestrpminthatrangeaspossible.
Ifyouprefereasinessofhandstarting,movethesensortoCCWdirectiontodelaythesparktiming.Butthenthemaximumrpm
willslightlydecline.
Ifyoupreferpower(highestrpm),movethesensortoCWdirection.Butthenyoucan'tstartbyhandflipbutonlywithstarter.
Inadditionbythefeatureoftheignitionsystem,itheatsupwithenginerunning.Whenyourestarttheenginebyhandflip,you
shouldopenthethrottlevalveslightlywhileit'shot.Andit'sbettertoenlargethechokewithoutwettingtheplug.
Forsafetywerecommendtouseanelectricstarter.
Note:Ifthefuelremainsinthecarburetoraftertheflight,thecomponentsmadefromrubbersuchasadiaphragmwillbe
degradedmorerapidly.Whenyoustoptheengine,stopitwithfuelcutandseethatthefueldoesnotremaininthe
carburetor.
Thecarburetorforagas-engineiselaborateanddelicate.Pleaseneverdisassembleit.Ifitʼsoutofcondition,please
consulttheshopyouboughtfrom.
8.Carburetor
Equippedwithasuitablecarburetorbytechnicalcooperationwith“Walbro”thatprovideshighlyreliablecarburetorsfor
othergas-engines.PleaserefertoFig.9andChapter13regardingadjustmentofthecarb.
9.Enginemounting,mufflerattachment,andbreather
wastedisposal(Fig.7)
FG-57TScanbeinstalledflexibleintheaxialdirectionby
varyingthelengthofstand-offmounts.Asthecarbcomes
outfrombackofthefirewall,hollowoutthefirewallas
possibleasminimumreferringtothecuttingsheetincluded.
Makethefirewallrobustenoughbecausethisparthasto
endurevibrationandtorquecausedbyproprotation.
Especiallywithalowloadprop,enginetendtogenerate
largevibrationthatisverydangerous.
Itispreferabletoapplysomeadhesives(suchasscrewlock)
onthetipofeachcapscrewtoavoidloosenesswhenyou
installtheengine.
Toensurethatcoolingwindpassesthroughtheengine,the
cowlingshouldbedevised.Alsomaketheairflowoutlet
largerthantheinlet.
Buildingsomebafflesinsidethecowlingtoflowthecoolairthroughthesurfaceofthe
engineeffectivelythatishighlyrecommended.Insufficientcoolingmaycauseengine
troublesuchasoverheatormufflerlooseness.
Themufflersshouldbesecurelyinserteddeeplyintotheangleadapterfromthecylinder
andtightenedupusingspanners.(Adhesives,suchasascrewlockagent,areeffective
againstloosenessandleakage.)
Makesuretofixtheoutletoftheflexiblemufflersoutsideofthecowlingusindthe
bracketincluded.
Forbreathertreatment,thereisalsoamethodinwhichthealuminumpipe,etc.arefixed
atthemuffleroutlettodiffusethehotairtogetherwithexhaustgasintotheair.
(Breathermayfunctionbysimplyejectingthetubefromtheengine).
Fig.7
From
Breathernipple
Exhaust
Muffleroutlet
Aluminumpipe
Baffle
Cowling
Coolair
Firewall
Stand-off
mount
Adjustable
(Standard35mm)
Hollowout
minimumarea

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10.Preparationforenginestart(assumingbreak-in)
(1)Mounttheengineonarobustandparallelizedtestbenchoronthefuselage.(Eitherway,theengineshouldbefixedandimmobile.)
(2)Checkwhetherthethrottlevalvebecomesfullyclosedandopenedcertainly.
(3)Checkwhethereachcodeoftheignitionsystemisconnectedcertainly.
(4)Use500-600cctankforthetestbench,oratankwhichhasappropriatecapacityforthefuselage.
(5)Forpiping,onlyconnectingthecarburetorwiththetankisneeded.(Makesurethereʼrenoleakageatalltheconnections.)
(6)Forfuel,prepareamixedgasolinewithavolumeratioof“gasoline:oil”=“20:1”orricherthanthat.
(7)Prepareawellbalanced22”x10”carbon-madeprop(Mejzlikisrecommended).
*Propattachmentposition
SinceSAITO4-strokegas-enginecanbemanuallystartedinforwarddirectionoftherotation,fixthepropinthepositionwhichfacilitates
vigorouscranking.
(8)Whenstartingwithanelectricstarter,alsoattachaspinner.(Thiswayofstartisrecommendedforsafety.)
(9)Asitisdifficulttojudgeclearlythepeakconditionof4-strokeengines,prepareatachometertopreventover-throttlingoroverheat.
(10)Prepareafuelpumpforgasoline.(Besuretoattachafiltertotheintakeport.Itisavailableasanoption.)
(11)Inordertocheckdischargeofthebreather,attachaheat-proofandgasoline-prooftransparenttube.
(12)Prepareabatteryfortheelectricstarterandthebarforcarbadjustment&choking(standardaccessory).
Caution:Ifthereʼsanyonestandinfrontoftheengine,besuretohavethemmovebehindtheairplanebeforestartingthe
engine.Alsokeepinmindthattheexhaustsmokeisharmfulforhealth.Keepawayoneofyourarmholdingtheairplane
awayfromtheprop.Oncetheenginestarts,movebehindtheairplane.Makeneedleadjustmentorothercontrolfromrear.If
theairplanecannotbefixed,askyourassistanttoholdtheairplaneforsafety.
Note:Pleasetightenupthepropregularlyatleastonceintenflights.Especiallyforawoodenprop,ittendstocompressedso
thatthenutsarerathereasytobeloosensopleaseconfirmcarefullythatthenutsaretightenedadequately.
11.Methodofstartingtheengine
Thefollowingistheprocedurewiththeenginemountedontheairplane.Fillupthetankwithfuel.
(Besuretoturnofftheswitchoftheignitionsystemuntiljustbeforetryingtostartuptheengine.)
(A)Startingmethodwithastarter(Recommended)
(1)Afterconfirmthatthethrottlestickislocatedatthefull-closeposition,turnonthetransmitterswitch.Thenturnonthereceiver
switchtocheckthrottlevalveandotheroperation.Afterthat,fullyclosethethrottlevalve.
(2)Powerontheignitionsystem.
(3)Openthethrottlevalveabout1/4fromthefullclosepositionbyusingthethrottlestick.(Startingwithexcessivelyopened
throttleisdangeroussincetheairplanejumpsforward.)
(4)Applythestartertothepropandactivateforabout5secondstostarttheengine.
(B)Manualstartingmethod(Forsafety,wearglovesanduseasafetystick)
(1)Sameas(1)notedabove.(Thethrottlevalvemustbefullyclosed.Otherwise,thefuelcannotbemanuallyintroduced.)
(2)AsshowninFig.8,passthechokebar(withM3.5threadonitstip)thoroughtheholeinthecowling.Thenturnthebarto
insertintotheM3.5internalthreadatthecenterofthethrottlelever.
(3)FullyclosethethrottleandpullthechokebarandfixitwithacliporclampasshowninFig.8sothatitmaynotgobackto
thepreviousposition.
(4)Graspthepropbyhandandturnittotheforwarddirection(CCW)forseveraltimes,untilthecarburetorgenerates
hissing-likesounds.
(5)Afterhearingthissoundforabout5times,quicklyflickthepropbycrankingitsome10times.Thenchokingiscompleted.
(6)Removethechokebar.
(7)Powerontheignitionsystemandopenthethrottlevalveabout1/4fromthefullclosepositionbyusingthethrottlestick.
(Startingwithexcessivelyopenedthrottleisdangeroussincetheairplanejumpsforward.)
(8)Flickthepropquicklyandenginewillstart.Iftheenginedoesnʼtstart,repeatthechokingprocedure(1)to(7).
*Afterstarting,runtheenginefor10to20sectofillupinsidethecarbwithfuelenoughbeforeopeningthethrottle.
12.Break-in
AsBreak-inisanimportantproceduretopulloutthemaximumperformanceoftheengine,itmustbecautiouslydone.
Thepurposeofbreak-inisinitiallubricationandadjustingofthemobilepartsundertheconditionwithrichfuelmixture.
Nevermakethefuelmixturelean.Leanfuelmixturecouldcauseseizureevenduringidlingorlowspeedrunning.
Thereʼsnoneedtoadjusttheslowneedleatthisstepasitʼsalreadysetadequately,soyouwilladjustonlythemainneedle
duringbreak-in.
Procedure;
(1)Afterfillingupthefueltank,starttheengineasdescribedintheaboveChapter11andrunitfor10secinlowspeed.
Fig.8
Chokebar
Temporary
fixedbyclip
Throttlelever
M3.5threadfor
Chokebar
Slowneedle
Throttlevalve
(Movetotheleft)
Cowling
Standardvaluefortheneedles
Incasesuchlikefollows,resettheneedle
totheStandardvalue(SDV).
・Afterbreak-in
・Whenadjustmentcanʼtbedonecorrectly.
・Whenbyfailure,turningtheneedletoomuch.
TosetSDV,firstfullyclosetheneedle.
(DONOTclosetootightly.Theneedles
canbetorneasily).
AfterthatopentheneedletoSDVas
follows.Throttlevalveshouldbefully
closedduringsettingtoSDV.
SDVforMainneedle:
2turnopenfromfullclose
SDVforSlowneedle:
4.5turnopenfromfullclose
Throttlelever
Slowneedle
CCW
torichCW
tolean
Mainneedle
CCW
torichCW
tolean
Fig.9

-5-
(2)Openthemainneedle2turnsfromthatstateandusethethrottlesticktofullyopenthethrottlevalve.Ifrichair-fuelmixture
canʼtbeobtained,openthemainneedleadditionally.Thencontinuerunningformorethan1tank.Duringthisinitial
operation,contactofeachpartinsidetheenginewillbematched.Somakethefuelmixturerichasmuchastheengine
doesnʼtstop.Donotcareaboutrunningsmoothnessatthisstep.
(3)Refillthetankandruntheenginewiththemainneedletoachievepeakandlessspeed(richer)alternatelyabout5times.
Andthenmaintainthepeakconditionlonggradually.Whenitgetsstable,thenoperatethethrottlesticktovaryslowspeed
tohighspeedseveraltimestochecktheresponse.Afterthatrunitfor1tankkeepinghighspeed.
(4)Whenitcomestorunsmoothlyatpeak,break-inonthegroundiscompleted.Thenperformtappetadjustingreferringto
Chapter14andadjustthecarburetorreferringtoChapter13.Afterthat,flyitforabout20timesinrichconditiontofinish
break-inintheair.
Alsoafterbreak-in,pleaseruntheengineinrichconditionaslongasitdoesnʼtaffecttotheflight.
13.Adjustmentofcarburetor
Sinceagas-enginehasnarrowrangeofair-fuelratio,adjustmentoftheneedlesisstricterthanaglow-engine.Andboth
needlesareinterferedslightlyfromeachothersoconfirmthebalanceofpeakandresponseafteradjustment.
Inprinciple,thecarburetorshouldfirstachievepeakbyadjustingthemainneedle.Thenperformingidlingwiththethrottle
valveandtheslowneedle.(Unlessthepeakiscertainlyachieved,idleadjustmentwillbedifficultandnotstabilized.)
*Theslowneedleissetastokeeparound1,500~1,800rpmatidlingatfactorydefault.
(1)Afterfillingupthefueltank,starttheengineasdescribedinChapter11andrunitfor1minutesinrichcondition.Thenfully
openthethrottlevalvewiththethrottlestick.
(2)Byturningthemainneedlewiththeadjustmentbarobservingtachometerandexhaustsound,achievepeakcarefully.
(3)Next,closethethrottlevalveuntiltheenginerunsstablywithanidlingrotationaround1,500rpmbyadjustingtheslow
needlewiththeadjustmentbarcarefully.(Duringflight,itʼsratherstablewithslightlyhighadjustedatidling.)
*Thebestrichnessoftheair-fuelmixtureatslowspeedisdependontheflightstyle.Generally,Scaleflightrequiresstabilityin
lowspeedsoslightlyleanconditionispreferable.OntheotherhandAcrobaticflightrequiresquickresponsefromlow
throughhigh,soslightlyrichconditionispreferable.
(4)Oncetheidlingisset,getthethrottlevalvefullyopenedgradually.Iftherevolutionbecomessloworgoesupsuddenly,
adjusttheslowneedlecarefullyuntilrpmraiseslinearlyfromidlingtopeakbyfine-tuning.
(5)Afteradjustmentof(4)iscompleted,performtheprocessfromidlingtopeakquickly.Ifrevolutiongetsdelayedtoachieve
peakevenifthethrottlevalveisfullyopened,fine-tunethemainneedleandperformthesameprocess.Repeatthis
fine-tuneandresponsecheckcarefullyuntiltheresponseimproves.
Atipforcarbadjustmentistosettheslowneedleslightlyleanaslongastheenginedoesnʼtstopwhenopenthethrottle
valvequicklyfromlowtohigh.
Forthemainneedle,richconditionasfarasitdoesnʼtaffecttotheflightisaknacktoincreasetheenginelife.
Thebesttunevariesdependingonmanyfactorssuchasweather,qualityoftheoil,prop,andsoon.
Duringyourflights,pleaseperformfine-tunesothatlow-middle-highspeedmatchesbestwiththeairplane.
Note:Duringearlystageofflights,taketheheighthighenoughtolandsafelyincasetheenginestopintheairsuddenly.It
willreducetheriskofcrashorlandingaccident.
Caution:Toomuchthrottlingthemainneedleisverydangerousbecauseitmightcauseknockingandthepropnutmightbecame
off.Onceyounoticeabnormalvibrationorsoundduringthrottlingthemainneedle,justreturntoopentheneedleimmidiately.
14.Normaloperation,maintenance,andadditionalinformation
(1)Aftercompletinggroundbreak-inoroperatingtheenginefor1hour,adjusttappetgaps(valveclearances)byfollowing
proceduretocompensateinitialwearing,whiletheengineiscold(Fig.10).Toperformitfirst,eithercylinderisOK.
(a)Removetheplugandrockercoversfromthecylinder.
(b)Turnthepropslowlyforwardbyhanduntiltherockerarmofintakestops.Furtherturntheproptobringthepistonto
theTDC(TopDeadCenter)ofcompressionstroke.
(c)Usetheattachedwrenchandhexagonalwrenchtoadjustthegapsindefi-
nitelyclosetozerowithintherangecompressionexists.Ifthegapislower
than0,thevalvehastobeopenedatallphasessothecompression
doesnʼtoccur(then,loosenthescrewtoreset).
Afteradjustment,putonthesparkplugandturnthepropforwardtocheck
ifthecompressionisenough.
(d)Oncheckingthegap,securelytighten(butnotexcessively)thelocknut.
(e)Dothesameadjustmentfortheothercylinder.
*Inthecaseoftheenginesforvehicle,smallgapisgiventotappetstoabsorb
valveelongation.HoweverforSAITOengines,gapbecomeslargerduringoperationsduetothermalexpansionofthecylinder
(madeofaluminum).Thereforesetthegapindefinitelyclosetozerowhentheengineiscold.
(2)Justafterstartuptheengine,performwarmuprunninginrichconditionforabout1minute,andjustbeforestoprunitat
idlingfor1minutetocooldownaswell.
(3)Whenstoptheengineafterthefinalflightoftheday,besuretostopbycuttingthefueltoremovefuelfromthecarburetor.
Andremovethefuelfromthetankandreserveitwithspecialcare.
(4)Sincethefuelcontainsmorethan5%ofoil,sometimestheexhaustvalvegetsdullbycarbonorsludgeespeciallyincold
atmosphere.Thenturnofftheignitionswitchandrotatethepropbyelectricstarter.Afterdilutetheoilcontentbythisway,
removethefuelfrominsidethecarbandtheengine.Ithelpsthevalvetomovesmoothly.
Or,removetherockercoverandapplyingsomeanti-rustspraytotheexhaustvalveiseffectiveaswell.
Tappetadjustment
Fig.10
Mustnotbeinserted
(overgap)
Limitgauge
(0.1mm)
Closeto"0"withnolimit
Note:Occasionallychecktappetgapbythoseprocedure.Whentheattachedgauge(limitgauge,t=0.1mm)comestobeinserted,gaphas
beenenlargedbeyondtheallowablelimit.Makeanadjustmenttolessenthegap.Tappetgapisoneofthemostimportantfactorsinthe
maintenanceof4-strokeengines.Operatingtheenginewiththetappetgapenlargedexcessivelywillcausepoorperformanceortroubles.

(5)Lubricationforpiston,connectingrod,bearingorcamgearisablow-bylubricationinwhichtheoilinthefuelgoesintothe
crankcasefromtheclearancebetweenthecylinderandpiston.Thereforetheenginelifeisaffectedbythepropertyofthe
fueloil.Pleaseusereliableoil.
(6)ChargethebatteryfortheignitionsystemandRCdevicefully.(Sincetheignitionsystemgenerateshightension,becareful
ofelectricalshock.)
(7)Sinceoverclosingthemainneedlecausesoverheating,adjustalittlemorerichthanpeak.Overclosingleadstoknockingor
overheatandhasanadverseeffectontheconnectingrodandcamgear.Wheretheairplaneachievespeakcompletelyat
thetimeofascentshouldbeaproperpeakoftheengineduringflight.
(8)Whenconnectingtheexhaustpipetothecylinderorattachingthepropnut,applythincoatofsiliconrubber(notexces-
sively)oradhesiveonthethreadsectionbeforetightening.Thispreventsleakageorloosening.
(9)Occasionallytightenthepropnutandexhaustnut(whileitishot).
(10)Pleasenoticethatourguaranteewillnotcoveranybreakageortroubleontheengine
causedbyuserʼsdisassemblingormodification.
(11)Takeanextremecareforsafetywhenoperatingtheengineorflyingthemodelairplanenottobotherothers.
(12)Anengineforamodelairplaneisnotatoy.Handleitwithanextremecare.
(13)Notesforpurchasingparts:
Pleasegiveorderstotheshopyoupurchasedfromwithasheetwithenginename,partnameornuber,andmarking
(alphabetonthelowerfaceofrearcover).
Optionalparts
・Filterwithweight[36-154] ・Neoprenetubeforgasoline(1m)[36-155]
・SparkplugCM-6[36-120] ・Aluminumspinnernut[57T-30]
・Coolingcover(1pair)[120S-166] ・Tappetadjustingkit[120S-161]
・Digitaltachometer[17-168] ・Smokingexhaustpipe(pair)[57T-167]
-6-
All specifications and models are subject to change without notice.
SAITO SEISAKUSHO, CO., LTD.
22-7, 3-chome, Tokagi, Ichikawa-shi, Chiba prefecture 272-0024, Japan
Phone: 047-378-4156 FAX: 047-378-4155
http://www.saito-mfg.com

No. ItemQty No. Qty
01 Cylinder(Left) 1 Rockerarmscrew&Nut
02 Cylinder(Right) 1 42-1,-2
06 Piston 2 43 Rockerarmpin 4
07 Pistonpin 2 44 Rockerarmbracket(left) 2
08 Pistonpinretainer 4 45 Rockerarmbracket(right) 2
09 Pistonring 2 46 Valveset(In&Ex) 4
10 Connectingrod 2 Valvespring&Keeper&Retainer
13 Connectingrodscrew 4 47-1,-2,48
Cylinderscrewset 48 Valveretainer(Cotter) 4
14-1,-2,-3,-4 49 Rockerarmcover 4
15 Crankcase 1 69 Intakepipe(Left) 1
17 Rearcover(Backplate) 1 70 Intakepipe(Right) 1
19 Breathernipple 1 73 Flexiblemuffler 2
20 Frontballbearing 1 80 Mufflernut 4
21 Mainballbearing 1 Carburetorcomplete
22 Rearballbearing 1 82-1-1,-1-2,-1-3,-1-6,-1-7,-1-8,
-1-9,-1-10,-1-11,-1-12,88,93
23 Crankshaft 1 Carburetorbodyassembly
Tapercollet&Driveflange 82-1-1,-1-2,-1-3,88
27-1,-2 88 Throttlelever 1
Propwasher&Nut Carburetorscrew&springset
28-1,-2,-3 82-1-9,-1-10,-1-11,-1-12
Crankcasescrewset Carburetorgasketset
31-1,-2,-3,-4 82-1-6,-1-7,-1-8
Enginegasketset 93 Intakevelocitystack(airfunnel) 1
32-1,-2,-3,-4,-8,-9 Enginemountset
33-1 Camgearhousing(Left) 1 95-1,-2,-3,-4,-5
33-2 Camgearhousing(Right) 1 Mufflerbracketset
34 Camgear(Left) 1 99-1,-2,-3,-4,-5,-6,-7,-8
35 Camgear(Right) 1 110 Antilooseningnut 1
36 Camgearshaft 1 120 Sparkplug(NGK CM-6) 2
Steelwasherset 140 Mufflerrightangleadapter 2
37-1,-2 152 Screw-pin(Fordriveflangesetting) 1
38 Tappet 4 Electronicignitionsystem
39 Pushrod 4 153-1,-2,-3,-4
Pushrodcover&Rubberseal Intakemanifoldassembly
40-1,-2,-3 164-1,-2,-3,-4,-5,-6,-7
41 Rockerarm 4
1set
1set
1set
1set
1set
1set
1set
1set
1set
1set
1set
1set
1set
1set
1set
1set
42
47
1set
91
90
83-1
82-1
164
153
99
95
31
32
37
40
14
27
28
SAITOFG-57TSPartsList
153
153-1
153-2
153-4
153-3
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