Saito FG-90R3 User manual

3.Break-inMOSTIMPORTANT!!
●Prop-recommendation:APC-24”x12”forbreakin.
●Use15:1fuel:oilratioforbreakin.
●Nevermakethefuelmixtureleanduringbreakin.
Itcouldcauseseizureevenduringidlingorlow-speedrunning.
●Beforestartingtheengine,openthemainneedleApprox.3turns
andtheslowneedleApprox.5turnsCCWeachfromfullclose.
●Starttheengine(usingastarterisrecommendedforsafety).
●Runforabout5secondsatlowspeedtowarmup.
●Openthrottlegraduallyuptooverhalfopen,inthemeantimeturnthe
mainneedleCCW.ContinuetoturnthemainneedleCCWuntiltheRPM
declines,keepingthethrottleopenedoverhalf.
●ThenturntheslowneedleCCWtomakemixturemuchricher.
●Runinthisveryrichconditionfor2tanks.
Note:
●Asthefuelcontainsoil,theexhaustwillproducesomeresidueontheairplane.
●Usereliableandwellbalancedprop,otherwiseitcancauseabnormalvibrationandmayresultinseriousaccident.
●Duringoperation,thescrewsallovertheenginecanbeloosenbyheatexpansionofmetal.Tightenthemup
occasionally.
●Whentheexhaustvalvegetsdullbycarbonorsludgeespeciallyincoldatmosphere,removetherockercover
andapplysomeanti-rustspraytotheexhaustvalvetohelpthevalvetomovesmoothly.
●Allresponsibilitiesfortheuseoftheengine,andotherobligationsandresponsibilitiesbasedonlaws,regula-
tions,etc.arebornebythepurchaserandtheuser,andSAITOSEISAKUSHOCO.,LTD.isexemptfromany
responsibilities.
Warranty:
●Ifthereisanydeficiencyfromthefactoryconcerningmanufacture,pleaseconsulttheshopordistributoryou
purchasedfrom,sothatourcompanywillrepairthemwithresponsibility.Anyfailureortroublecausedby
unnecessarydisassembly,modification,orotherusesthanthoseprovidedintheinstructionmanualisnot
subjecttothewarranty.
Φ37.2mm 27.6mm 89.99cc
D24”~25”xP10”xP12”
・Filterwithweight[G36-154] ・DurabletubeforGasoline(1m)[G36-155]
・Aluminumspinnernut[57T-30] ・Tappetadjustingkit[120S-161] ・Digitaltachometer[G17-167]
Bore
Mainbody:3,161g/Muffler:157g/Ignition:250g
Stroke Disp.
Weight(Approx.） RPMRange Approx.1,300-7,000rpm Maxonground Approx.6,000-6,500rpm
Propeller CM-6Plug
Optionalparts
Gasoline60-70㏄classApplications
Batteryforignitionsystem Voltage:6-12V,greaterthan1,000mA(2-3SLi-Poor5SNiMH)
・Limitgauge(0.1t)fortappetadjustment1pc ・Spannerfortappetadjustinglocknut1pc ・Carburetoradjustmentbar1pc
・Sparkplug[CM-6](Attachedtotheengine)3pcs ・Mufflerset  1set・Chokebar  1pc
・Ignitionsystem（w/sensor） 1set ・Mufflerbracket 1set・Plugwrench  1pc
・Standoffmount1set ・Anti-looseningnut 1pc ・Hexagonalwrench 1set
Specifications
FG-90R3InstructionManual
4.Needlereferenceposition(SetAfterBreak-in)
●Mainneedle：Approx.2.5~3turnsfromfullyclose
●Slowneedle：Approx.4-1/2~5turnsfromfullyclose（Thenthrottleshouldbefullyclosed）
●Actuallythebestconditionoftheneedlevariesdependingontheprop,temperature,humidityandso
on.Pleaseadjustbasedontheengineperformanceduringflight.
5.Tappetadjustment
ThevalveclearanceshouldbecheckedandadjustedafterBreak-inandeveryafter2hourswhilethe
engineiscold.Beforeadjustingtappetgaps,tightenthescrewsaroundcylindersetc.
1.Removethesparkplug
androckerarmcoversof
#1cylinder.Thenturnthe
propCCWbyhandto
placethepistonatTDCof
compressionstroke.
2.Loosenthelocknutand
adjustthegapbyhexago-
nalwrenchuntilyouget
thecorrectgap(below
pic)forbothofintake&
exhaust.
3.Oncethegapisset,
tightenthelocknutand
attachtheplugand
covers.Dothesame
adjustmentforthe#3-#2
cylindersinorder.
4.Turnthepropbyhandto
checkifthecompression
isenough.Ifthegapisless
than0,thevalveisalways
openedsightlyandlose
compression.Thenadjust
again.
CorrectGap
Mustnotbeinserted
Closeto“0”withnolimit
Limitgauge
(0.1mm)
2.Ignition
●Ignitionarrangement-Placethemainunitasfarfromotherelectricaldevicesaspossible.
(1)Plugcord（meshedhightensioncord)
Inserttheplugcapof(1)Plugcorddeeplyintotheplugof
#1cylindertomakesureitwillnotcomeoff.Theother
capsandplugsshouldbeinstalledbythesameway.
(Refertocylinder#onthereverseside)
(2)Sensorcord
Connectwiththecordfromthesensorattachedtothe
engine.
(3)Batterycord(black/redcord)
Useafullychargedbatterythathasadequatespec.(6-12V,
morethan1000mAisrecommended.).Betweenthe
batteryandmainunit,makesuretosetaheavyduty
switchwhosecapacityishigherthan3A.
(4)Tachometercord
Connectthedigitaltachometer(Option).Otherwisetheconnectorisnormallyvacant.
ForCCW
Makerich Main
needle
ForCW
Open
Throttle
lever
Slowneedle
CCW
Rich
CW
Lean
Mainneedle
Throttle
lever
Standard
accessories
FuelTank FuelLevel
ToOutsideoftheplane
Ventline
fuelsupplytocarburetor
Fuelfillerline
Ventline
Gasoline-compatible
tankstopper
Gasoline-compatibletubing
Filterwithweight
Setthecenterofthecarb
slightlyabovethefuellevel
Closeaspossible
Firewall
Standoffasrequired
Hollowoutreferringto
thecuttingsheet
PlugCap
SwitchCapacity:3A〜
Sensor
(2)Sensorcord
Battery
Voltage:6-12V
Capacity:1,000mA〜:
( 1)PlugCord MainUnit
(3)BatteryCord
(4)TachometerCord
Loosenthelocknut
Adjustthegapturning
thesetscrew
TopDeadCenter
（Thestatebothvalvesareclosed) Tightenthelocknut
tofixthesetscrew
3.Methodofchoke（Noneedwhenyouusestarter）
●Inadvance,makeathinholeonthecowlingtoinsertthechokebar/
slowneedleadjustmentbar.
●Duringchoking,besuretoturnofftheswitchoftheignitionsystem.
●Asshowninthefig,passthechokebar(withM3.5threadonitstip)
throughtheholeonthecowling.Thenturnthebartoinsertintothe
M3.5internalthreadatthecenterofthethrottlelever.
●Fullyclosethethrottleandpullthechokebarandfixitwithaclipor
clampasshowninthefigsothatitmaynotgobacktotheprevious
position.
●Graspthepropbyhandandturnitinthedirectionofnormaloperation
(CCW)forseveraltimes,untilthecarburetorgenerateshissing-like
sound.Afterhearingthissoundforabout5times,quicklyflicktheprop
approximately10times.
●Afterthat,removethechokebar.Afterthat,powerontheignitionsystemandflickthepropquicklytostarttheengine.
Iftheenginedoesnʼtstart,repeatthechokingprocedure.
Cowling
chokebarforinsert
M3.5screw
Throttlelever
Throttlevalve
（Movetotheleft）
Slowneedle
chokebar
Temporaryfixed
byaclip
1.Fuel
●Thefuelismixtureofregulargasolineandhigh-quality2-strokeengineoil.
●[Exampleofoilrecommendation]
・KlotzKL-200OriginalTechniplate ・DeluxeMaterialsPowerModel2T-Setc.
●Besuretousethemixture“gasoline:oil=15~20:1”byvolumeratio.(Ex.1000mlofgasolineshouldbemixed
withmorethan50mlofoil).
●Duringthebreakinprocess,use15:1mixedfueltoensurethebestlubricationforinitialrunning.
●Anydamagecausedbythefuelused,inwhichtheoilratioislowerthan20:1ratio,isnotwarranted.
●Donotusegasolinecontainingethanol.Itmaycausenotonlypowerlossbutalsocorrosioninsidetheengine.
SAITOSEISAKUSHO,CO.,LTD.www.saito-mfg.com
22-7,3-chome,Tokagi,Ichikawa-shi,Chibaprefecture272-0024,JapanPhone:047-378-4156FAX:047-378-4155
FG-19R3InstructionManual
Allspecificationsandmodelsaresubjecttochangewithoutnotice.

No. Item Qty No. Item Qty
01 Cylinder 3 Pushrodcover&Rubberseal
06 Piston 3 40-1,-2,-3
07 Pistonpin 3 41 Rockerarm 6
08 Pistonpinretainer 6 Rockerarmscrew&Nut
09 Pistonring 3 42-1,-2
10 Masterrod 1 43 Rockerarmpin 6
11 Linkedconrod 2 44 RockerarmbracketL 3
Conrodlinkpin&E-ring 45 RockerarmbracketR 3
12-1L,-2,-3 Valve(In&Ex)
Cylinderscrewset 46-1,-2
14-1,-2,-3,-4 Valvespring&Keeper&Retainer
15 Crankcase 1 47-1,-2,48
17 RearcoverA(Intakemanifold) 1 48 Valveretainer(Cotter) 6
19 Breathernipple 1 49 Rockerarmcover 6
20 Frontballbearing 1 69 Intakepipe 3
22 Rearballbearing 1 Flexibleexhaustpipe
23 Crankshaft 1 78-1,-2,-3
Tapercollet&Driveflange Carburetorcomplete
27-1,-2 82-1-1,-1-2,-1-3,-1-4,-1-5,-1-6
Propwasher&Nut -1-7,-1-8,-1-9
28-1,-2,-3 88 Throttlelever 1
Crankcasescrewset 93 Airfunnel 1
31-1,-2,-3,-5,-6,-7 Enginemountset
Enginegasketset 95-1,-2,-3,-4
32-1,-2,-3,-4,-5,-8,-9 Mufflerbracketset
33 Camgearhousing 3 99-1,-5,-7
35 Camgear 3 110 Antilooseningnut 1
36 Camgearshaft 3 120 Sparkplug(NGKCM-6) 3
Steelwasherset 128 Heatsink 3
37-1,-2 129 Lubricationadopter 1
38 Tappet 6 152 Screw-pin 1
39 Pushrod 6 Electronicignitionsystem
153-1,-2,-3,-4
37 1set
153 1set
31 1set
95 1set
32 1set
99 2set
78 3
27 1set 82-1 1set
28 1set
42 1set
12 2ea.
46 3ea.
14 1set
47 1set
40 1set
153
-2
153
-4
153
-3
153
-1
1011 12-3 12-2 32-3
17 31-1
12-1L
82-1
-6
82-1
-4
82-1
-5
82-1
-1
82-1
-2
82-1
-3 88
93 82-1
-8
82-1
-7
82-1
-9
38
39
14-4
31-5
32-8
48
152
44
40-2
36
78-1 78-3
07
40-1
06
09
08
32-2
14-3
42-1
43
47-1
14-2
47-2
45
14-1
37-2 32-9
41
42-2
32-5
110
23
31-6
22
32-4
69
120
01
40-3
19
31-7
129
15
27-2 20
33
28-2 28-3 28-1 27-1
49
99-1
99-5
99-7
35
37-1 128
32-1
31-3
78-2
46-2
46-1
250
100 70 52
222
86
16 36
70
80
M10x1.25
Rotationdirection
回転方向
#1
#3
#2
CylinderIDNumber(Viewfromfront)
シリンダ番号（前方向より見て）
Dimensions
外形寸法図
95-3 95-1 31-2 95-2 95-4