Saito FG-90R3 User Manual

5.Break-inMOSTIMPORTANT!!
●Prop-recommendation:Mejzlik-24”x12”.
●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fullyclosed.
●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1literoffuel..
●Now“initial”break-inisdone.
●Graspthepropbyhandandturnitseveraltimesinthedirectionofnormaloperation(CCW)untilthecarburetorgenerateshissing-like
sound.Afterhearingthissoundforabout5times,quicklyflipthepropapproximately10times.
●Removethechokebar.Thenpowerontheignitionsystemandflipthepropquicklytostarttheengine.Iftheenginedoesnʼtstart,repeat
thechokingprocedure.
Φ37.2mm 27.6mm 89.99cc
D24”~25”xP10”xP12”
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:6-8.4V,greaterthan1,000mA
・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
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.(6-8.4V,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
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:6-8.4V
Capacity:1,000mA〜:
( 1)PlugCord
MainUnit
(3)BatteryCord
(4)TachometerCord
7.Tappetadjustment
Thevalveclearanceshouldbecheckedandadjustedafterbreak-inandeverytimeaftertwo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compres-
sion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)
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
Slowneedle
CCW
Rich
CW
Lean
Mainneedle
Throttle
lever
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willnotbecoveredbywarranty.
●Donotusegasolinecontainingethanol.Itmaycausenotonlypowerlossbutalsocorrosioninsidetheengine.
ver.Aug,2018
6.Adjustmentofcarburetorafterinitialbreak-in.
◇Needlereferenceposition(Setafterinitialbreak-in)
●Starttheengineafteradjustingtheneedletothefollowingreferencevalue.
●Mainneedle：Approx.2.5~3turnsCCWfromfullyclosed
●Slowneedle：Approx.4+1/2~5turnsCCWfromfullyclosed(Thenthrottleshouldbefullyclosed)
●Actually,thebestpositionoftheneedlesvarydependingontheprop,temperature,humidityand
soon.Pleaseadjustasnecessaryafterobservingtheengineperformanceduringflight.
◇Peakadjustment
●Afterstartingtheengine,warmupforapprox.30secondsatlowspeed.
●Achievethepeakatfullthrottle.
→TurnthemainneedleCWgraduallytothepositionwheretheRPMisgreatest(thepeak).ContinuingtoturntheneedleCWpastthepeak
couldleadtoseizuresoturnitslowlyandcarefully.IftheRPMsuddenlydecreasesafterpassingthepeak,instantlyturnthemainneedle
CCWtoagainincreasetheRPM.Otherwiseitcoulddamagetheengineseriously.
●OnceachievingpeakRPM,returnthethrottletolowspeed.Makeanoteofthepositionofmainneedleatthepeakatthattime.(How
manyturnsyoudidCWbasedonthereferencevalue.)
◇SlowneedleAdjustment
●AfterachievingpeakRPM,nextisslowneedleadjustment.OpenthethrottlefromlowRPMtofullthrottlequickly.
●TurntheslowneedleCCWslightlyiftheenginehesitatesforamomentorstallsbeforetheenginereachesmaxRPMbecausethemixture
istoolean.
●TurntheslowneedleCWslightlyiftheengineisslowtoreachpeakRPM(fullthrottleset)becausethemixtureistoorich.
●AdjusttheslowneedleasaboveuntiltheRPMfollowsthethrottlemovementsmoothly.Theimportantpointistoadjusttheslowneedle
AFTERthemainneedlehasbeenadjustedtoitspeak.
●Nowbreak-inatgroundlevelisdone.Adjusttappetsbythemethoddescribedlater.
◇Pre-flight/Flightadjustment
●Whentheslowneedleadjustmentisdone,checktheresponsebyrevvingupfromlowspeedtofullthrottlequicklyseveraltimes.
●OpenthethrottlefullyandturnthemainneedleCCWapprox.60〜90degreesfromthepeakposition.Thisistomakethefuelmixture
richerintheairwheretheRPMgethigherthanontheground.
●Afteralladjustmentsaremade,flyyouraircraftandfinetunetheengineaccordingtothesituation.Basicallytuningshouldbedonewith
themainneedle.Readjustmentoftheslowneedleisrarelyneededifthefirstadjustmentoftheslowneedlehasbeendonesuccessfully.
・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]
3.Propeller
●RecommendedpropellerisMejzlik24x12.
●Useawell-balancedone.Neverusethepropellerthathasbeenscratchedordamagedevenifslightly.
●Asthepropelleriscompressedslightly,tightenthe6boltseveryhourofoperation.
4.Methodofchoke(Noneedwhenyouusestarter)
※Chokingisthemeansbywhichfuelisfedtotheenginewhenyoustartitby
handflipping.Thusitisunnecessarywhenusingstarter.Startingwithaelectric
starterisrecommendedforsafety.
●Inadvance,makeathinholeinthecowlingtoinsertthechokebar/slowneedle
adjustmentbar.
●Duringchoking,besuretoturnofftheignitionswitch.
●Asshowninthefig,passthechokebar(withM3.5threadonitstip)throughthe
holein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.
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

Saito FG-90R3 Specifications

General

Brand	Saito
Model	FG-90R3
Category	Engine
Language	English