Twin-Cylinder Gasoline Four-Stroke Engine
Twin-Cylinder Gasoline Four-Stroke EngineINSTRUCTION MANUALFG-57T
NOTICEAll instructions, warranties and other collateral documents are subject tochange at the sole discretion of Horizon Hobby, Inc. For up-to-date productliterature, visit www.horizonhobby.com and click on the support tab for thisproduct.Meaning of Special Language:The following terms are used throughout the product literature to indicatevarious levels of potential harm when operating this product:NOTICE: Procedures, which if not properly followed, create a possibility ofphysical property damage AND little or no possibility of injury.CAUTION: Procedures, which if not properly followed, create theprobability of physical property damage AND a possibility of serious injury.WARNING: Procedures, which if not properly followed, create theprobability of property damage, collateral damage, serious injury or deathOR create a high probability of superficial injury.WARNING: Read the ENTIRE instruction manual to become familiarwith the features of the product before operating. Failure to operate theproduct correctly can result in damage to the product, personal property andcause serious injury.This is a sophisticated hobby product. It must be operated with cautionand common sense and requires some basic mechanical ability. Failure tooperate this Product in a safe and responsible manner could result in injuryor damage to the product or other property. This product is not intended foruse by children without direct adult supervision. Do not attempt disassembly,use with incompatible components or augment product in any way withoutthe approval of Horizon Hobby, Inc. This manual contains instructions forsafety, operation and maintenance. It is essential to read and follow all theinstructions and warnings in the manual, prior to assembly, setup or use, inorder to operate correctly and avoid damage or serious injury.
SAFETY INSTRUCTIONSIntroductionCongratulations on purchasing aSaito 4-cycle gasoline engine. Whencared for properly, these high-quality,finely crafted engines offer many yearsof modeling enjoyment.This instruction manual has beendeveloped to ensure optimumperformance from the Saito gasolineengine you have purchased. Saitogasoline engines are adapted fromsimilarly sized glow fuel engines andare designed with an emphasis towardshigh performance, durability andweight savings. Where appropriatethe engines have been modifiedto adapt to gasoline fuel usage byequipping it with a four-stroke gasolineengine carburetor and an ignitionsystem matched to your engine. Theinstructions must be read throughcompletely and understood thoroughlyprior to mounting and running theengine.Features of a gasoline fueled fourstroke engine:- Fuel efficient- Fuel cost is low compared to glowfuels- Your airplane will be cleaner at endof a flying session- No separate igniter system isrequired1Safety WarningsWARNING: Model enginesproduce a substantial amount of powerwhich can create unsafe situationsif not used correctly. Always usecommon sense and observe all safetyprecautions when operating, handlingor performing any procedure involvingyour engine. Failure to follow safetyprecautions could result in seriousinjury and property damage. Always ensure spectators, especiallychildren, are at least 30 feet awaywhen running the engine Always ensure that the propelleris securely attached to the engineshaft and all retaining fasteners aretightened properly before EACHflight. Use of blue threadlock totighten nuts is advisable. Always keep small parts out of thereach of children as they can bechoking hazards Always secure the airplane beforepowering the engine. Always keep your face and bodyaway from the path of the propellerblades when starting or running yourengine. Always stand behind the propellerwhen making carburetor adjustments. Always wear safety glasses orgoggles when starting and runningyour engine. Always keep your fuel in a safe placewell away from sparks, heat or
2SAFETY INSTRUCTIONSanything that can ignite. Always ensure the aircraft is secureand will not move once the engine isstarted. Always rebind your transmitterto your receiver(s) after setup andbefore first flight. Always ensure the throttle failsafe isset to low throttle in your transmitter. Always perform a range check priorto flight. Always cut off the fuel supply (pinchor disconnect the fuel line to thecarburetor) or use the throttle linkageto shut off the air in order to stop theengine. Never use hands, fingers, or any otherbody part to stop the propeller. Never throw any object into apropeller to stop it. Never run the engine in the vicinityof loose small objects, such as gravelor sand, to avoid the propeller uncontrollably throwing such materials. Never wear loose clothing or a looseneckstrap when operating your modelengine as these items could becomeentangled in the propeller. Never have loose objects such asscrewdrivers, pencils etc. in yourpockets when operating your modelengine. These could fall into thepropeller. Never allow fuel to come into contactwith eyes or mouth. Gasoline andother fuels used in model engines arepoisonous. Always ensure gasoline and fuel arestored in a clearly marked containerwell away from the reach of children.Precautionary Guidelines Always mount the engine securely ona bench mount or high-quality enginemount. Always use the correct size and pitchof propeller for your engine. Refer toPropeller Chart in this manual. Always confirm proper balance ofyour propeller prior to installationof the engine. Failure to do so couldcause damage to the engine and/orthe airframe. Always utilize an electric starter tostart your engine. Always discard any propeller thatis nicked, scratched, cracked ordamaged in any way. Always run your model engine in awell-ventilated area. Model enginesproduce possibly harmful carbonmonoxide fumes. Always store your fuel safely in asealed, water-resistant container. Always store fuel in a cool,dry location. Do not allow fuelcontainers to come in direct contactwith concrete, as the fuel may absorbmoisture. Always responsibly discard fuel ifthere is condensation and/or waterinside the fuel container. Never return unused fuel from thefuel tank back into the fuel container. Never attempt to repair or modify apropeller beyond its intended use. Never handle model engines,mufflers and/or tuned pipes until theyhave had time to cool. They becomeextremely hot when in use.
IGNITION SYSTEMDisassemblyDo not needlessly disassemble yourSaito engine. Only qualified individuals should perform engine repairs.Damage due to improper disassemblywill not be covered under warranty.Engine PartsIdentificationIt is important to be able to identify theparts of your Saito engine. In theback of this manual you will find anexploded view of Saito twin-cylindergasoline engines, as well as a chartwhich includes part numbers anddescriptions. This will assist you ineasily and rapidly identifying therespective parts of your Saito engine.Ignition System.1. Spark Plug Leads (Mesh-coveredhigh-tension cord) Attach the sparkplug leads to the spark plugs. Theseare both identical and can be usedon either side of the engine.2. Sensor cord (Red, Black and whitecord) This is connected to the cordfrom the already attached ignitionsensor unit mounted to the output ofthe crankcase. This connector hasa specific orientation, pay attentionwhen connecting these two cords.3. Battery cord (Black and redcord with a universal servo stylefemale connector). Attach a 6–9volt battery of at least 1000mAhcapacity. 2S Li-Po batteries arethe recommended power source3because of their light weight anddurability. The ignition amp drawis approximately 790mAh at fullthrottle.CarburetorThe gas twin engines are equippedwith a suitable carburetor developed incooperation with Walbro for exclusiveuse in the Saito gasoline engine it ismounted to. This carburetor has anegative-pressure type fuel pump soyour tank can be mounted in most anyconvenient position relatively close tothe engine. The negative pressure toactuate the pump is drawn internallyfrom the intake manifold so no externaltubes or connections are required.NOTICEIf the fuel remains in carburetorafter the days flying ends, the rubbercomponents of the carburetor willtend to degrade rather quickly. Whenstopping the engine after the lastflight of the day cut the fuel supplyto the carb and run the engine untilthe carburetor is dry. (The parts ofthe carburetor made of rubber areconsidered consumables and are notcovered under the warranty of theengine.)NOTICEThe included gasoline carburetor iselaborate and delicate. Do not attemptto disassemble the carburetor yourself.If the performance of the carburetorindicates that service is required send itto our qualified service technicians.
4 SUPPORT EQUIPMENTSupport EquipmentThe following items, which are notincluded with your Saito engine, arenecessary in order to operate themodel engine:1. Fuel. For maximum protectionand longevity of its engines, Saitorecommends a fuel containing a20:1 gasoline to oil ratio. We recommend a synthetic based oil such asEvolution Oil (EVOX1001Q). Highoctane fuel is not needed for thisengine.2. Propeller and Fuel Consumption:If you are using a high load (propdiameter and or pitch is large), theair-fuel mixture needs to be richerthan with a light load. The mainhigh-speed needle will need to beopened even though the rpm's willbe lower than if you were usinga smaller propeller. Converselyif you are using a low load (propdiameter and or pitch is small), theair-fuel mixture needs to be leanerthan with a heavily loaded engine.The main, high-speed needle willneed to be closed, even though therpm's will be higher than if youwere using a larger propeller. Forthe longest engine life and best fuelconsumption, the propeller youchoose should provide your bestlevel flight speed at less than fullthrottle.3. Fuel Filter and Fuel Pump.Because commercial gasoline hasmany impurities be sure to use areliable filter when refueling theonboard tank of the aircraft.CAUTION: If a quality filtersystem is not used impurities anddirt will be transported to the carb,clogging internal filter screens andpassages, possibly causing an enginefailure or poor running of your engine.This could lead to a crash resulting ininjury or property damage.4. Fuel Tank. Choose a tank witha capacity of 14–17 ounces (400500cc's). This will provide onaverage a flight time of 11 to 14minutes at full throttle. Make sureyou use a gasoline-compatible fueltank stopper and gasolinecompatible fuel line both inside thetank and for all connections outsideof the tank. (We recommendSAIG36155 for your internal andexternal fuel line) In the fuel linebetween the tank and the carburetor,make sure you use an inline fuelfilter of some type (HAN143recommended). We also recommendyou use SAIG36154 Filter withweight as your clunk inside the tank.5. Spark Plug Wrench. An includedspark plug wrench is used to removeand tighten spark plugs.6. Manual or Electric Starter. Formanual starts, a heavy-duty leatherglove is highly recommended.
ENGINE MOUNTINGCAUTION: Never use your barefingers to start any model engine. Thiscould lead to injury.There are a variety of electric starterson the market. The Hangar 9 PowerPro H-D 12V starter (HAN162)will work perfectly on all of the twincylinder gasoline Saito engines.Engine MountingWhen mounting the engine pleasenote that the carburetor of the engineextends beyond the mounting padsof the engine mount and this requiresthe use of at least 1.0-inch (25mm)standoffs between the firewall and theengine mounting pads. Conversely,you could provide a relief hole inthe firewall for the carburetor tostick through into the interior of thefuselage/nacelle.The engine mounting holes are sizedfor M4 screws. If you choose adifferent screw, carefully enlarge theholes in the engine mount to providethe proper clearance.Make sure that adequate cooling airis circulating around the engine! Thecooling air should pass around andthrough the cylinder fins and over theexhaust pipes as insufficient coolingwill cause the engine to run poorly andcause mechanical failures. Withoutcooling air over the exhaust pipes, it isvery likely they will become loose atthe cylinder head. Always ensure thatthere is at least a 3:1 (5:1 preferred)ratio of cool air exhaust outlet area toinlet area. If you need to add baffles5within your cowl to direct the air overand through the cylinders, you shoulddo this before you have an overheatingproblem that could possibly damageyour engine.When attaching the muffler pipes,screw the pipes into the cylinder headsas far as possible before tighteningthe locking nut to the cylinder head.This ensures adequate strength in thethreaded joint between the cylinder andthe muffler/exhaust pipe. (The use ofa thread locking compound will helpgreatly in this area.)BreathernippleMufflerclampIncluded with your engine is a mufflerclamp that is designed to be mountedto the airframe and provides thesupport necessary for the exhaustpipes. It is important to either usethe supplied exhaust pipe mounts ordevise another method for yourself toadequately support the exhaust tubesand prevent tube breakage in flight.
6 P R E PA R I N G Y O U R E N G I N EPreparing your engineThe first run on any engine, whether2-cycle or 4-cycle, is critical to thefuture of the engine itself. During thistime, metal mating parts (piston andcylinder, ball bearings, etc.) settle in.Care must be taken that the engine isclean and free of any dust or grit thatmay have accumulated while buildingthe model.There are two accepted methods forbreaking in a new engine: test standmounted and run or aircraft mountedand run. Either method is acceptable;however, mounting the engine to a teststand allows the engine to be observedthroughout its operation, as well aselevating it above the ground and awayfrom harmful dust and dirt.Note: Because your engine may havebeen sitting for an extended period oftime prior to running it, a few drops oflight oil applied through the crankcasebreather nipple (19 on the explodedview) and down the push-rod tubes(40) will ensure proper lubrication forthe first run.Regardless of the mounting methodchosen for break-in, the followingprocedures are applicable:1. Use a break-in fuel as described inthe“Support Equipment” (20:1 gasoline:oil ratio).2. Use the proper spark plugs. Yourengine includes the NGK CM-6spark plugs (SAIG36120).3. Check whether you can completelyopen and close the throttle barrel. Ifit cannot be completely closed youwill have a hard time drawing fuelto the carburetor for a manual start.4. Check to make sure the ignitionsystem wiring is connectedcorrectly.5. Use a 14 –17 oz (400-500cc) fueltank for your test bench. Use theinstalled tank if breaking in mountedto an airframe.6. Use a 22 x 10 propeller for break-in.We prefer a carbon propeller suchas a Mejzlik. Since this engine caneasily be started manually, positionthe propeller with the blades atabout 1:30 and 7:30 position (whenviewed from the front) as the enginecomes up against compression. Thiswill be a good position to allow aquick and strong flip of the propwhen starting.If starting with an electric startmotor, also add a spinner nutor cone to the propeller/engineassembly.CAUTION: The safest way tostart the engine is with an electricstarter.
S TA R T I N G T H E E N G I N E7. Because it is more difficult to setthe needles of a 4-stroke enginethan a 2-stroke engine by ‘ear’, wehighly recommend the use of anoptical tachometer (HAN156) whenattempting to set the needles of any4-stroke engine.8. Make sure you use a fuel filterbetween the fuel tank and theengine. Also make sure you usefiltered fuel in the fuel tank.How to choke your SaitoGasoline engine equippedwith the Saito/WalbroCarburetor.Provided with your engine is a chokebar. This bar has a 90 degree bend onone end and a 3.5mm thread on theopposite end for engaging the internalthreads of the rotating barrel of thecarburetor.You engage the internal threads ofthe rotating barrel by inserting thethreaded end of the choke bar intothe hole in the center of the lever androtate clockwise to engage the internalthreads. Once engaged with the threadsyou can begin the choke procedure:1. Make sure the ignition module isturned off.2. Fully close the throttle barrel. (If itis not fully closed it will be difficultto draw fuel into the carburetor forchoking).73. Pull the choke bar and fix it in placewith a clamping tool of some sortagainst the side of your cowling so itcannot spring back into the normaloperating position.4. Rotate the propeller by hand in aclockwise direction (from the frontof the airplane) until you hear ahissing sound come from the carburetor a total of 5 times. This getsfuel into the carburetor.5. Now quickly flip the propeller 10times in a clockwise direction andyour choking process is complete.This gets fuel into the cylinders ofyour engine.6. Remove the choke bar from thecarburetor, turn on the ignition andbegin flipping the propeller. Yourengine should readily start. If itdoesn’t, repeat the above procedure.Starting The EngineThe following procedures assume theengine is properly mounted and thetank is full of fuel.Starting with an electricstarter motor.1. Turn on the transmitter, and thenturn on the receiver switches.Position the throttle stick to the fullyclosed position.2. Turn on the ignition system.3. Open the throttle to approximately¼ throttle.
8ENGINE BREAK-IN4. Engage the electric starter for about5 seconds and the engine shouldstart.Manually starting the engineCAUTION: Use a starting stickor leather workman’s gloves to protectyour hands.1. Turn on the transmitter, and thenturn on the receiver switches.Position the throttle stick to the fullyclosed position.2. Check that the ignition system isturned off.3. Insert the choke bar through the carband engage in the rotating barrel ofthe carb.4. Pull the choke bar out and hold inposition.5. Next to pull fuel into the carb, graspand rotate the propeller througha number of times. This chokingoperation works better if thepropeller is not quickly flipped butpulled through the operation. Onceyou hear that fuel is flowing to thecarburetor, rotate through another 5times.6. Now quickly flip the propeller 10times in a clockwise direction andyour choking process is complete.This gets fuel into the cylinders ofyour engine.7. Release and remove the choke bar.8. Turn on the ignition.9. Quickly flip the engine through.The engine should start easily. Ifit does not start, repeat the abovechoking procedure.Break-inBreak-in is a very important start toa long and enjoyable engine life soplease do these steps with patience andcare.The main purpose of the break-inperiod is to provide plenty of lubricantto each and every moving part inthe engine. Rough engine operationduring break-in because of a rich fuelmixture is ok and required to ensurethat adequate lubrication is beingprovided to the newly mated parts.1. Start the engine as described andallow it to operate at low rpm for3–5 seconds.2. While running at slow rpm, openthe main (high-speed) needle ½turn and open the throttle ½ way. Ifa rich mixture is not evident at thispoint, open the low-speed needle toachieve a rich mixture. While noparticular rpm target is given, thisshould all be accomplished at orbelow 5000 rpm. The object is torun this way for two full tanks. Thisprovides sufficient lubrication to allthe mating surfaces to allow them tobegin to work together.3. Reset the low-speed needle to thefactory specification and run onefull tank of fuel with the rich highspeed needle setting and ½ throttle.4. With a fresh tank of fuel restartthe engine, this time leaning thehigh-speed needle to achieve a
CARBURETOR ADJUSTMENTSpeak setting followed by richeningto cool. Do this about 10 timesthroughout the course of this tankof fuel.5. Leaving the high-speed needle ina peaked condition, check yourthrottle response, going fromlow to high and back, graduallylengthening the duration of highrpm. Continue the break-in processuntil you can get a stable high rpmfor at least one minute. At this pointthe ground break-in is complete.CarburetorAdjustmentsLow-speedneedle9main (high-speed) needle ½ turn openfrom the target position. In principalthe carburetor should be adjusted byfirst achieving peak rpm with the main(high-speed) needle valve and thenadjusting the low-speed needle valve.(Until the high-speed needle settingis fixed low-speed adjustment will bedifficult and not stable.)1. Fill the fuel tank and then start theengine as previously described.After the engine starts allow it towarm up for 20 seconds and thenfully open the throttle.2. Utilizing a tachometer, adjust themain (high-speed) needle valve topeak rpm carefully. Note as youlean the motor the drop off in rpm,richen back to the peak rpm fromthat position.CAUTION: Over-closing(leaning) the main needle valve canbe dangerous, causing pre-ignition,knocking and possibly loosening thepropeller. If you hear these symptoms,immediately richen the needle valve.High-speedneedleNotice: Before adjustment make surethe low-speed needle is set at the targetposition. In particular make sure this isdone after doing the break-in process.It is also preferable to start with the3. Next close the throttle until theengine idles reliably at about 1700rpm. Careful coordination betweenthe idle (low-speed) needle and thethrottle position is needed to achievethis.4. After you have a reliable idle nowcheck for a good slow transitionfrom low to high. If the engine
10N O R M A L E N G I N E O P E R AT I O Nbogs down during the transition,then the idle is too rich and needsto be adjusted leaner. If during thetransition the rpm increases quickly,the idle is likely too lean and needsto be adjusted richer. Continueworking in this manner until youare satisfied with the slow transitionfrom low to high rpm.5. Once you have completed the slowtransition adjustment now is thetime to check how the engine reactsto a fast throttle transition from lowto high speed. If the quick transitionresults in a gradual increase in rpmto a peak setting, the high speedis likely too rich and should beadjusted leaner. If the engine quitsor hesitates during this transition thehigh-speed adjustment is likely toolean and should be made slightlyricher. Continue working in thisway until you are satisfied with thequick low to high speed transitionof the engine.Because the engine will unload inthe air when the propeller operatesin turbulent free conditions, it isnecessary to richen the high speedslightly before your first flight. Finaladjustment of the carburetor needsto be made after actually flying theairplane in the conditions and mannerthat you enjoy.Normal EngineOperation1. Ensure the ignition battery isadequately charged before flyingyour aircraft. The ignition systemusage is roughly 790mAh at fullthrottle so judge the requiredcapacity of your pack based on theflight time expectations you have.2. Connect a heat-proof and gasolineproof line to the crankcase breathernipple. Make this line long enoughto exit the cowl so the interior ofthe engine compartment will remainmostly oil free.3. Lubrication for the piston, conrod,bearings and cam gears comes fromthe blow-by fuel and oil betweenthe cylinder and the piston. Theengine is designed to provideadequate lubrication to thesecrankcase-located parts when goodreliable oil is used. We have usedEvolution Oil (EVOX1000Q) withgood results.4. Over-closing (over-leaning) themain (high-speed) needle valvewill result in overheating, preignition, knocking, engine failureand adverse effect on the conrodsand cam gears. Always set the mainneedle on the ground slightly richto allow the peak rpm and setting tooccur once the airplane is airborne.5. When attaching the exhaust pipeto the cylinder or the propeller nutto the shaft, apply a threadlocking
ENGINE MAINTENANCEcompound before attaching thetwo parts together. This will helpto keep these parts tight and helpprevent any leakage from occurring.6. The propeller nut and the exhaustlocking nuts should be tightenedwhen the engine is hot.Engine MaintenanceNOTICE: DO NOT NEEDLESSLYDISASSEMBLE YOUR SAITOENGINE. ONLY QUALIFIEDINDIVIDUALS SHOULD PERFORMENGINE REPAIRS. DAMAGE DUETO IMPROPER DISASSEMBLYWILL NOT BE COVERED UNDERWARRANTY.If it becomes necessary to dismantleyour Saito engine, the followingprocedure should be followed:It’s important to maintain identification of the “left”and“right”cylinder parts when dismantling andreassembling the engine. Lookingforward from the rear of the enginewith the engine upright, the cylinderon the right side is the right cylinder.Therefore, the cylinder tothe left is, of course, the left cylinder.11Adjustment of theTappet Gap1. Once the break-in on the ground iscompleted, you should adjust thetappet/valve gap for the first time.After the initial adjustment, inspectthe tappets at least after every 10hours of operation and check forthe proper gap. Your experiencemay cause you to do this morefrequently.2. Adjustment of the tappet is donewhen the engine is cold.3. Remove the spark plugs and therocker covers from the engine.4. Rotate the propeller slowly in thenormal direction of rotation. Onceyou see the intake valve open andclose, rotate the propeller another180 degrees and you should be atthe compression top dead center.5. In that position loosen the tappetlocking nut and adjust the clearanceto virtually zero. (You should notbe able to insert the included feelergauge between the tappet and thevalve.)6. After the gap is checked tighten thelocking nut firmly but do not overtighten.Note. In normal maintenance offull-size four-stroke engines, a littleclearance between the tappets and thepushrods/camshaft is allowed becauseof the assumed expansion of the valve.Saito engines are different becauseof the aluminum construction. The
12TIPS FOR EXTEDED ENGINE LIFEcylinder in Saito engines elongatesmore than the valve and the clearancegets larger as the engine heats up.Therefore, in cold conditions theclearance should be virtually zero.After several hours of running theoccasional check of the tappet clearance can be performed quite easily.Once the engine is cool set the engineup as described above (intake closedand at top dead center) and check tosee if you can slide the included feelergauge (0.10mm thick-ness) betweenthe tappet and valve. If you can it is atits absolute maximum and valve tappetadjust-ments should be made. If youcannot slide the feeler gauge betweenthe two, then your adjustment is fineand nothing further needs to be done.Tips For ExtendedEngine LifeTo add longer life to your Saito engine the following recommendationsare made:1. Use a fuel 20:1 gasoline to oil ratio.2. Use recommended spark plugs.3. Use the proper propeller size andbalance the propeller prior to use.4. Use a tachometer for precise engineadjustments.5. For long-term storage, make surethere is no fuel left in the tank,caburetor and the engine. Store theengine in the box or on the airplanewith the nose down in order to keepoil in the bearings.FG-57T Needle ValveTarget PositionsHigh Speed - 2 turns 50 minutesLow Speed - 4 turns 10 minutesSpark Plug GapPlease maintain your spark plug gapbetween 0.7mm (0.027") and 0.8mm(0.031")
TROUBLESHOOTINGTroubleshooting13Generally speaking, there are very few things that will keep today’s moderngas engines from starting. To that end, make sure you’re using good quality“fresh” fuel, you have a fully charged ignition battery, and good spark plugsinstalled. Should the engine fail to start after these items are verified, refer tothe troubleshooting chart below.SYMPTOMCAUSECORRECTIVE ACTIONEngine fails tostartLow voltage onignition batteryReplace/recharge theignition batteryBad spark plug(s)Inspect/replace bad spark plugInsufficient primingRepeat priming procedure“Flooded” due toexcessive primingDisconnect ignition battery,remove the spark plugs, androtate the propeller severaltimes to “clear” the cylinderEngine fires butOver-primeddoes not runDisconnect ignition battery androtate propeller several times to“clear” cylinderEngine starts butMixture too richslows down andthen stopsClose high-speed needle valve1/4 turn and start again. Repeatuntil engine is running smoothlyEngine starts,Mixture too leanspeeds up, andthen quitsOpen high-speed needle valve1/4 turn and start again. Repeatuntil engine is running smoothlyRough idleChange plug typePlugIn the event that none of the above procedures results in the engine runningproperly, contact our service department for suggestions:Horizon Service Center4105 Fieldstone RoadChampaign, Illinois 61822877-504-0233 (Mon–Fri 8:00–5:00 CST)
14PA RT S L I S TTwin Cylinder Gas Cross-Reference ChartTWIN CYLINDER GAS CROSS REFERENCE CHARTITEM01 Cylinder, Left02 Cylinder, Right06 Piston07 Piston Pin08 Piston Pin Ret09 Piston Ring10 Con Rod11 Linked Con Rod12 Conrod Linkpin/Scr13 Con Rod Screw14 Cyl Screw Set15 Crankcase19 Breather Nipple20 Frt Ball Bearing21 Main Ball Bearing22 Rear Ball Bearing23 Crankshaft24 Pinion-crankshaft25 Pinion gear pin26 Collar, Crankshaft27 Tapered Collet & Drv28 Prop Wash/Nut29 Prop Nut Spinner31 Crankcase Screw S32 Eng Gasket Set33 Cam Gear Housing (right)33 Cam Gear Housing (left)34 Cam Gear Left35 Cam Gear Right36 Cam Gear Shaft37 Steel Wash Set38 Tappet39 Pushrod40 Push Rd Cvr Rb sea41 Rocker Arm42 Rckr arm scrw nut43 Rckr arm pin46 Valve in/out47 Vlv spg/kpr/rtr48 Vlv Retainer49 Rocker Arm Cover69 Intake manifold, lft70 Intake manifold, 3120S46120S47120S48150S49G57T69G57T70ITEM73 Muffler, Left80 Muffler nut90 Carb scr/spring set91 Carb gasket set93 Intake velocity stk96 Tool set97 Instruction Manual99 Muffler bracket110 Anti-lo
Saito 4-cycle gasoline engine. When cared for properly, these high-quality, finely crafted engines offer many years of modeling enjoyment. This instruction manual has been developed to ensure optimum performance from the Saito gasoline engine you have purchased. Saito gasoline engines are adapted from similarly sized glow fuel engines and
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