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OS ENGINE GT33 Manual

1. ll SUPER FILTER S E PROPELLER LOCKNUT Code No Description 72403051 SET FOR SPINNER 74003540 M5 Stand Off Engine Mount 1 25 4mm 4pcs 5 16 M4 45910200 79871515 Hex Socket Head Bolt M5x15 10pcs sets 5 16 M5 45910300 79871520 Hex Socket Head Bolt M5x25 10pcs sets W SUPER FILTER L E NON BUEBLE WEIGHT 55500004 Lock Washer M5 10sets 72403050 9 21109005 Propeller Washer 518 71531010 74003550 M5 Stand Off Engine Mount 1 1 4 31 8mm 4pcs 79871515 Hex Socket Head Bolt M5x15 10pcs sets 79871520 Hex Socket Head Bolt M5x25 10pcs sets E BLIND NUT 10pcs E LOCK WASHER 10sets 55500004 Lock Washer M5 10sets M5 79870050 M5 55500004 21109005 Propeller Washer 18 74003560 M5 Stand Off Engine Mount 1 1 2 38 1mm 4pcs 79871515 Hex Socket Head Bolt M5x15 10pcs sets 79871520 Hex Socket Head Bolt M5x25 10pcs sets 55500004 Lock Washer M5 10sets E M5 STAND OFF ENGINE MOUNTS 21109005 Propeller Washer 18 Code No Description 74003570 M5 Stand Off Engine Mount 1 3 4 44 5mm 4pcs 79871515 Hex Socket Head Bolt M5x15 10pcs sets Hex Socket Head Bolt M5x30 10pcs sets 79871520 Hex Socket Head Bolt M5x25 10pcs sets 798700
2. 25 O S GENUINE PARTS amp ACCESSORIES 26 ENGINE THREE VIEW DRAWINGS 27 MEMO Mee 28 SAFETY INSTRUCTIONS AND N WARNINGS WARNINGS ABOUT YOUR O S ENGINE Never touch or allow any object to come Remember that your engine is not a toy but a highly efficient internal combustion machine whose power is capable of harming you or others if it is misused or abused As owner you alone are responsible for the safe operation of your engine so act with discretion and care at all times If at some future date your O S engine is acquired by another person we would respectfully request that these instructions are also passed on to its new owner E The advice which follows is grouped under two headings according to the degree of damage or danger which might arise through misuse or neglect These cover events which might involve serious in extreme circumstances even fatal injury These cover the many other possibilities generally less obvious sources of danger but which under certain circumstances may also cause damage or injury N WARNINGS e Observe the laws and regulations in each country and district concerning the usage transportation and storage of gasoline Ask details at fire station in each district e Model engines generates considerable heat Do not touch any part of your engine until it has cooled Contact with the muffler s
3. Install the ignition module and its power source as far as possible away from the servos and receiver power source Connect the sensor leads of the igniter module while red black three parallel wires to the sensor leads from the engine Connect the battery leads of the igniter module red black two parallel wires to the power source Make sure the jackets of high tension cord does not touch the engine and cowl to avoid accidental short circuit Install he plug cap on the plug securely OS aam I Precautions Do not disassemble the ignition module and plug cap The ignition module is irreparable Replace it when necessary Be careful not to mount the ignition module so that it can be hit by water gasoline or exhaust Avoid using the engine when the external temperature is over 40 C Do not move the rpm sensor as it is placed at it s optimum position otherwise the engine will not run properly Do not pull on the high tension cord to remove the plug cap or the wire will break Be sure to hold the plug cap to remove it Be careful not to damage your fingers while removing it Do not connect nor disconnect the rpm sensor with the ignition module on or there is a possibility it will fire and the engine start 14 S mans A A i Discard any propeller which has become split Never touch or allow any object to come into contact with the rotating propeller and do not crouch over
4. S ane Two stroke gasoline engine for airplanes GT133 It is of vital importance before attempting to operate your engine to read the general SAFETY INSTRUCTIONS AND WARNINGS section on pages 2 5 of this booklet and to strictly adhere to the advice contained therein e Also please study the entire contents of this instruction manual so as to familiarize yourself with the controls and other features of the engine e Keep these instructions in a safe place so that you may readily refer to them whenever necessary itis suggested that any instructions supplied with the aircraft radio control equipment etc are accessible for checking at the same time S mam SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O S ENGINE 2 5 ABOUT THE ENGINE 6 ENGINE PARTS NAME 7 SILENCER INSTALLATION 8 FUEL TANK amp LINES 9 CARBURETOR PARTS NAME 10 CARBURETOR LINKAGE 11 12 IGNITION MODULE 13 14 PROPELLER 15 16 Y l N VBS T 24 O CONTENTS MIXING OF OIL 77m 17 RUNNING IN STARTING 18 19 NEEDLE ADJUSTMENTS 20 21 FLIGHT amp MAINTENANCE 22 23 ENGINE EXPLODED VIEW 24 ENGINE PARTS LIST
5. c Cod A quiessy uuv exou5 09 18Z26c L Z VZOLLM aduon ongen 00018 82 c Aiquiessy eAjeA peeu 00091 82c cc sodz Jaysed AeA peey 9 JOJOINqIeD 000SI88c Ic le d 18409 000Z70 8c 0c OXSt J9A0D N 15S dos Uld JULIO OvSecl6c 6l 00L20 82 8L Kay ginupooM 61280062 Zl weyusyuely 000c0 82 9L u Buueeg ieg 0000888c SI 6uiu Ou 01 10762 L vI Bnig eseoxuel2 00 10762 tl sodz 198 A 15S Bululejay 1osu sS uorneloH Le 200vZ L L JOSUBS uolne1oH O0c c00vZ El seSyue1oO 00010 82 L 3 Guueeg ieg 0101 792 LL JeuseM 1sniu 0000cI9v OL Jeoeds eAug 00080 82 6 JeuseM 1ejedoug 00060 82c 1 8 18S INN 4907 00001 82 8 poy Bunoeuuo 000S0882 JeurejeH Uld uoisid 00071 82 9 uld uo siq 00090 8c S uoisid OOCEDE8C v Bury uoisid OOVEDE8Z Jeur1Jepui 5 OOLEOESZ c exsec peeH 09LTOE82 L peeH Jepul 000r088Z uonduoseg ON 9pO ON LS SLYVd 3NIDN3 EMMIS o 25 S mns O S GENUINE PARTS amp ACCESSORIES
6. sparks or anything else which might ignite it Do not smoke or allow anyone else to smoke near to it Carry out mixing of gasoline and oil in a well ventilated and free of fire outdoor place or there is a possibility of fire Refill the models fuel tank only after the engine has well cooled down or there is a danger of fire Observe the laws and regulations in each country and district concerning the usage transportation and storage of gasoline Ask details at fire station in each district gt PP b 17 Use regular gasoline No need to use high octane gasoline Alcohol based glow fuel cannot be used in this engine Not only will the engine not work properly but the internal carburetor plastic parts will be damaged Use high quality commercially available 2 stroke engine oil Follow the oil manufacturers recommendations concerning the mixture ratio of gasoline and oil If there is no recommendation mix with a 30 1 ratio We have checked and approved the following oil mixture ratio KLOTZ ModelLube 50 1 This does not mean we guarantee the quality of this oil Follow the instructions in the running in section concerning the mixture for running in With a gasoline engine passages in the carburetor are narrower than that of a glow engine and therefore very sensitive against foreign matter such as dust It is suggested to use optional accessory Super Filter L Code No 72403050 when filling a tank in the
7. Check the tightening of each screw especially engine installing screws and silencer installing screws each time Also for the first several flights tighten the screws after each flight As previously mentioned it is vitally important to avoid operating the engine in conditions where dust distributed by the propeller may be deposited on the engine and enter its working parts Remember to keep your fuel container closed to prevent foreign matter from contaminating the fuel Install a fuel filter to prevent foreign matter in the fuel container from entering the fuel tank O S Super Filter L is available as an optional extra Install an in line fuel filter between the tank and carburetor to prevent foreign matter in the tank from entering the carburetor Clean these filters periodically If these precautions are neglected restrictions of fuel flow may cause the engine to cut out or the fuel air mixture to become too lean causing the engine to overheat With a gasoline engine rust hardly occurs Check the exterior to make sure there is nothing wrong and wipe off any oil res Fill the carburetor with fuel at the conclusion of a day s flying Pay careful attention to fire and ignition source when carrying and storing the model If the engine is stored without filling the carburetor with fuel the inside parts will dry out and not work properly at the next running If the engine quits out of fuel refill the carburetor
8. are available Propeller fib S from O S Propeller Locknut Set for Spinner Code No 45910200 4mm and Code No 45910300 5mm NOTE Make a habit of always checking the tightness of the propeller before starting the engine Remember that especially with wooden propellers there is a tendency for the material to shrink or for it to be reduced by the serrated face of the drive hub Retighten the propeller nut if necessary after loosening the Safety Propeller Locknut The locknut should be tightened firmly after retightening the propeller nut Propeller washer Since the GT33 is intended to be started with an electric starter the addition of a spinner assembly for centering the starter sleeve is desirable Special propeller locknut sets are available for use with spinners Use a good quality well balanced spinner enclosing the propeller boss Make sure that it is of precision made and sturdy construction so that the spinner shell cannot loosen when the starter is used Make sure the spinner notches do not interfere the propeller If they do cut the notches to clear MIXING OF OIL Gasoline is poisonous Do not allow it to come into contact with the eyes or mouth Always store it in a clearly marked container in a cool and dark place out of the reach of children There is a possibility that it may damage your health AN Gasoline is highly flammable Keep it away from an open flame excessive heat sources of
9. model from a container used for transportation or storing OS aam Always check the throttle linkage is disconnected the engine becomes If it AN uncontrollable which may result in a serious accident Take care that loose clothing ties shirt sleeves scarves etc do not come into contact with the propeller Do not carry loose objects such as pencils screwdrivers etc in a shirt pocket from where they could fall through the propeller arc Use an electric starter for this engine The wearing of safety glasses is also strongly recommended If you try hand starting be sure to use a chicken stick or heavy glove Never attempt to start the engine with bare hand Be sure to carry out adjustments of the high speed needle and slow speed needle after stopping the engine RUNNING IN STARTING Use a fuel with increased oil content and set the needle a little on the rich side Too rich a needle setting may cause misfiring or erratic running due to fouling of the plug Use a 25 1 fuel oil mixture if the particular brand of oil states 50 1 mix Set only the high speed needle 100 200 below maximum rpm The low speed needle need not be richened No need to carry out running in on a bench nor with the model fixed Just fly the model with the above mentioned fuel and needle setting A total of 10 flights 3 4 litters fuel are required Avoid prolonged full throttle running at initial stage and gradually extend
10. retaining screw is loosened or tightened with the throttle valve fully opened or closed excessive force will be applied which will results in breaking the lever OS asm E Choke valve rod Linkage Connect the linkage as illustrated NOTE Linkage parts are not supplied 12 OS aam source on do not hold the plug plug cap high tension cord nor grounding wire or you will get a shock When checking the spark plug with the power Be sure to equip an externally operable switch for the ignition system battery to stop the engine if started unexpectedly without switching on the radio system or there is a possibility of injury E Major specifications Consumption current is 600mA 6 000rpm User a power source of more than 1000mA h capacity The ignition module is set not to operate below 120rpm for safety The voltage of power source is 4 8 7 6V rated Ni Cd Ni H 4 6 cells Li Po Li Fe 2 cells 13 IGNITION MODULE Installation Install the ignition module taking sufficient anti vibration measures Install the ignition module at least 100mm away from the engine and in a place where there is airflow so that engine exhaust heat and radiation heat do not affect it s operation Do not share the power source with receiver and use a separate power source Equip an ON OFF switch between the ignition module and its power source and install it in a place where can be operated from outside the model
11. the engine when it is running Install a top quality propeller of the diameter and pitch specified for the engine and aircraft cracked nicked or otherwise rendered unsafe Never attempt to repair such a propeller destroy it Do not modify a propeller in any way Check the ignition module for spark when installing the plug cap on the plug and be careful about getting a shock Make sure there is no flammable material or gasoline vapors near by that could ignite Do not turn the propeller with the ignition module on or 15 there is a possibility the engine will start PROPELLER The choice of propeller depends on the design and weight of the aircraft and on the type of flying in which you will be engaged Determine the best size and type after practical experimentation As s starting point refer to the props listed in the table shown below Slightly larger or even slightly smaller props than those shown in the table may be used but remember that propeller noise will increase if blade tip velocity is raised due to high rpm or if a larger diameter lower pitch prop is used Be well aware propeller rotating arc is very large due to a large propeller used with this engine Carry out the needle adjustments only after stopping the engine Do not allow your face or hands to come close to the rotating prop Type Size DxP Running in 18x8 18x8 18x10 18x12 Sport Acro Scale 20x8 20x10 Warning Make sure t
12. the full throttle running time WARNING When ground running the engine avoid dusty or sandy locations If dust or grit is drawn into the engine this can have a ruinous effect drastically shortening engine life in Do not start your engine in an area containing loose gravel or sand The propeller may throw such material in your face and eyes and cause injury Pp b 18 OS meme a matter of minutes Ill Initial needle position When starting the engine for the first time set both the high speed needle and the slow speed needle two turns open from the fully closed position With this position both high and slow speed mixtures will be rich If the settings are upset come back to this setting and adjust them according to procedure in the needle setting section II Starting by an electric starter 1 Turn on the transmitter switch 2 Turn on the receiver switch 3 Turn on the ignition switch 4 Open the choke valve fully 5 Pull down the throttle stick on the transmitter fully or to the 1 8 opened position 2 to 3 clicks With the throttle stick half to fully advanced the fuel will not be delivered to the carburetor suitably when an electric starter is applied Also the model will move forward with engine high power right after it is started which is very dangerous 6 Tell the helper and onlookers that you will start the engine now and have the helper hold the model securely 7 Apply the electric star
13. this adjust with transmitter function exponential and throttle curve etc or differential of throttle linkage Cooling is more vitally important to a gasoline engine than to a glow engine If overheating symptoms loss of power at full throttle or exhaust note at mid speed changes from cloudy one to clear one are observed during flight immediately stop flying and carry out the following countermeasures 22 OS creme FLIGHT amp MAINTENANCE 1 Enlarge the air intake cutout on the cowling 2 Enlarge the air outlet cutout on the cowling It is vitally important 3 Partly cover the air intake cutout on the cowling where air does not hit direct the engine 4 Install an air guiding plate on the fuselage and cowling so that cooling air may be guided to the cylinder portion of the engine and muffler When the interval between the flights is short and the engine is still hot it may be possible overheating symptoms are observed by circulating the head from the former flight through the engine even if the overheating symptoms were not observed during the former flight In this case leave it until the engine is fully cooled down in hot weather it may take more than one hour or run the engine for 4 to 5 minutes at idling Hi Maintenance after the day s flights Please pay attention to the matter described below to ensure that your engine serves you well in regard to performance reliability and long life
14. with fuel When the engine is not to be used for a long period more than a year remove the engine from the model clean the outside then remove the carburetor and plug all tubing Clean inside the engine by rotating the crankshaft with the engine immersed in container filled with gasoline Also use gasoline to clean the outside of the carburetor Clean the outside only because the inside parts are sensitive to foreign substances After cleaning the engine dry it well then inject a small quantity of oil used to mix fuel and rotate the crankshaft several times to distribute the oil well inside the engine Finally reassemble the engine and store it in a dry place after inserting it in a heavy vinyl bag 23 sodz maios Buturejed eA eA peeg X 101e4nqe2 SSXS A 8881 86 mang dej MeJs Jo ed sk sodp malos Buturejeg ld 19 02 GLXPIN GLY 12867 sodo weiog Bululejoy peeH 1eput o OZXEN 002 12864 LEL euiBue ue ui pesn sog ezis ON 9po5 Q sjies sodo SLIS MIHIS dVO SSXSIO SON 02X W O SvXSW O 8 ALMMMIE S Q 24 onou 1noullA 1ueureAoJduil 10J uoneieje o alqns eje suoreoyioeds eu L es sodoL SpxsgIN wejos de Gv81786 Joxset jsneux3 O0 vL68C Jeoue iS 0 0S 3 000Sct8c 9 INO Bnid eds 00069917 ZO 51 ainpow uoniu 6 o zZ00r Od weJoS Sx0t FN 0S 18762 c
15. 2 60092590 011203
16. 50 Blind Nut M5 10pcs sets 55500004 Lock Washer M5 10sets 74003520 M5 Stand Off Engine Mount 1 2 12 7mm 4pcs 21109005 Propeller Washer 518 79871535 Hex Socket Head Bolt M5x35 10pcs sets 74003580 M5 Stand Off Engine Mount 2 50 8mm 4pcs 79870050 Blind Nut M5 10pcs sets 79871515 Hex Socket Head Bolt M5x15 10pcs sets 74003530 M5 Stand Off Engine Mount 3 4 19 1mm 4pcs 79871520 Hex Socket Head Bolt M5x25 10pcs sets 55500004 Lock Washer M5 10sets 79870050 Blind Nut M5 10pcs sets 21109005 Propeller Washer 18 The specifications are subject to alteration for improvement without notice 26 OS amem THREE VIEW DRAWING 62 8 Specifications E Displacement 32 98 cc 2 013 cu in N 2 E Bore 36 0 mm 1 417 in E Stroke 32 4 mm 1 276 in li PracticalR P M 1 800 8 000 r p m ib Bi Output 3 9 ps 3 85 hp 9 000r p m 5 2 5 E Weight 984 2 g 34 72 oz Engine Q 160 5 g 5 66 oz Silencer o 895 LI O 86 5 2 Mm 3 8 3 Dn E 5 16 24 UNF 2A CIS n L S Ai 377 34 0 84 5 40 4 196 6 Dimensions mm 27 CEZ Y PRECISION gunut Pp SS Re Uy NS UNE G NJ t SS Gr pw Z2 M Sry SV AG THE Stanparos OF O S ENGINES mraco ro URL http www os engines co jp Copyright 2011 by O S Engines Mfg Co Ltd All rights reserved Printed in Japan 6 15 3 Chome Imagawa Higashisumiyoshi ku Osaka 546 0003 Japan TEL 06 6702 0225 FAX 06 6704 272
17. ating symptom when performing torque roll and hovering the mixture is too lean Land the model and open the slow speed needle approx 15 degrees Repeat this procedure until power remains steady 16 If the above symptom is not detected with prolonged torque roll and hovering but sluggish to increased rpm when the throttle is fully opened abruptly the mixture is too rich Land the model and close the slow speed needle approx 15 degrees until sluggish rpm increase disappears Note Generally a gasoline engine is sensitive to a lean mixture compared with a glow engine and will stop without warning hesitation and stops with overheating It is recommended that the engine be run with a slightly richer mixture OS asm Hi Checking prior to flight When the engine is started make sure the radio control system works normally distance test Engine does not run erratic with full throttle Idling is stable Responds positively to the throttle operation Warm up is finished Warm up is required as with full size aircraft and car engines Take off the model after warming the engine for approx 10 seconds with full throttle E Precautions in flight A slight engine rpm increase and decrease delay is normal Abrupt throttle operation will the cause engine to quit Move throttle smoothly Due to the construction of the carburetor 70 8026 of maximum power develops with half throttle If you feel uneasy with
18. dations Use a strong enough material for the mounting face of the model such as birch ply firewall of more than 8mm thick Make sure the mounting face of the model is flat If it is uneven work on it to be flat When shims are added to change the thrust angle work on it to be flat Engine mounting face has been high precision machined flat Make sure mounting face of the model is also flat OS aam Use a tank designed for gasoline Tanks designed for glow fuel use a rubber cap which is deteriorated by gasoline A 350cc tank will provide 13 14 minutes flight With full throttle it will provide 7 8 minutes flight Install a commercially available gasoline fuel filter between fuel tank and carburetor Clean the filter from time to time For plumbing use TYGON F 4040 Yellow color or strong nitrile rubber of more than 3mm ID and 6mm OD Replace tubing periodically as it becomes hardened Replace tubing inside the fuel tank every six months SILENCER INSTALLATION Use 5mm steel hex socket head bolts to install the engine Do not use brass soft steel nor aluminum screws because they are not strong enough Also use the Nord Lock Washers optional extra and other anti loosening washers or apply locking agent Be sure that there is sufficient air intake and outlet area on the model for engine cooling to avoid overheating Pay careful attention to the cooling since a gasoline engine generates mor
19. e Do not start your engine in an area containing loose gravel or sand The propeller may throw such material in your face and eyes and cause injury S aam ABOUT THE ENGINE B This engine is designed for experienced fliers STANDARD ACCESSORIES Beginners and newcomers should not use this engine Spark Plug CM 6 g B The engine unit silencer carburetor and ignition module are specially designed E 5030 Silencer m It offers broad power characteristics suitable for Exhaust Gasket sport flight as well as acro flight B The large and dense cooling fins ensure sufficient cooling against overheating E The specially designed ignition module IG 02 is equipped with a micro computer and designed not to operate below 120 rpm B The engine is designed to operate choking easily and also designed to equip Choke valve rod Ignition module Assembly IG 02 OS ama ENGINE PARTS NAME Spark Plug Cylinder Head E 5030 Silencer Carburetor Complete High Tension Cord WT1024 AM Crankcase RPM Sensor Propeller Washer Sensor Leads Crankshaft S creme Frequent exposure to an open exhaust may i Be sure to use an effective silencer muffler eventually impair your hearing Such noise is also likely to cause annoyance to others over a wide area in your model securely Mount the engine following the manufacturers recommen
20. e heat than a glow engine Secure at least a 30mm dia area around the air intake of the carburetor so that the air intake will not be restricted Cut out the firewall big enough if necessary FUEL TANK amp LINES Use fuel line keepers at the end of the tubing to prevent at from coming off This engine does not require a muffler pressurized fuel System but be sure to provide an air vent Be sure to install an in line fuel filter between the tank and carburetor to prevent foreign matter in the tank from entering the carburetor Clean the filter periodically di Be sure to equip air vent pipe Be sure to use fuel line keepers to prevent tubing from coming off Be sure to replace tubing inside periodically To carburetor fuel inlet tubing for re fuelling Be sure to use a gasoline resistant fuel tank cap OS meme Pulse Inlet Carburetor Body High Speed Needle Slow Speed Needle Spring Throttle Return 10 OS avenue Connect the throttle linkage so that the engine can be stopped via radio operation NOTE When loosening and tightening each retaining screw do so with the throttle valve at mid position If the throttle valve lever retaining screw is loosened or tightened with the throttle valve fully opened or closed excessive force will be ap
21. ective R ange Less 1 2 Fully open Throttle Opening 3 4 Carry out the needle settings as follows lll Adjustment on the ground 1 Set both needles at two turns open from the fully closed position 20 OS aam NEEDLE ADJUSTMENTS Start the engine Open the throttle valve slowly until fully open and run the engine for 10 seconds to warm the engine Set the throttle stick 3 clicks advanced from the bottom and measure rpm with a tachometer and write it down Close the slow speed needle approx 30 degrees and measure rpm with a tachometer and write it down Be sure to adjust the slow needle only after stopping the engine Repeat step 4 to locate the slow speed needle position where maximum rpm is achieved Open it approx 90 degrees from this position This is the basic slow needle position Open the throttle valve fully and measure rpm with a tachometer and write it down Close the high needle approx 30 degrees and measure rpm and write it down Be sure to adjust the high needle only after stopping the engine Repeat step 7 to locate the high needle position where maximum rpm is achieved Open it approx 30 degrees from this position This is the basic high needle position Set the throttle trim on the transmitter so that the idle rpm is approx 1 800 approx 1 600rpm when idle down function is used 10 Warm the engine for 10 seconds with the thrott
22. hat the propeller is well balanced An unbalanced propeller and or spinner can cause serious vibration which may weaken parts of the airframe or affect the safety of the radio control system Do not use any propeller which has become split cracked or nicked even very slightly or received strong impact even if no apparent damage is visible Sam E PROPELLER amp SPINNER ATTACHMENT There is a risk particularly with powerful four stroke engines of the propeller flying off if the prop nut loosens due to detonation knocking in the combustion chamber when the engine is operated too lean or under an excessively heavy load Obviously this can be very hazardous To eliminate such dangers the O S Safety Locknut Assembly was devised Install this as follows 1 Ream the propeller shaft hole to 8 1mm bore with an appropriate reamer checking that the hole is exactly centered P ssa be equal sss To be equal Ream to 8 1mm dia 2 Install the prop to the engine shaft followed by the retaining washer and prop nut and tighten firmly with a 14mm wrench not supplied 3 Add the special tapered and slotted locknut and secure with a 12mm wrench while holding the prop nut with the 14mm wrench not supplied OS creme 16 Note Some spinners which are retained at the top of the cone cannot be used with the prop locknut supplied with the AAA Y engine In this case optional S MUS locknut sets
23. ilencer cylinder head or exhaust header pipe in particular may results in a serious burn e Never operate your engine in an enclosed space Model engines like automobile engines exhaust deadly carbon monoxide Run your engine only in an open area e Do not operate the engine nor model alone or there is a possibility of injury into contact with the rotating propeller and do not crouch over the engine when it is running Gasoline is poisonous Do not allow it come into contact with the eyes or mouth Always store it in a clearly marked container in a cool and dark place and out of the reach of children There is a possibility that it may damage your health Gasoline is highly flammable Keep it away from an open flame excessive heat sources of sparks or anything else which might cause it to ignite Do not smoke or allow anyone else to smoke near to it Carry out the mixing of the gasoline and oil outdoors or in a well ventilated place away from any source of fire to prevent the possibility of a fire Refill the fuel tank only after the engine is well cooled down or there is a danger of fire e Any propeller requires utmost attention to handle Be sure to follow the instruction manual supplied with a propeller e This engine was designed for model aircraft Do not attempt to use it for any other purpose e Start the engine only after installing it in the model Do not s
24. le fully open then idle the engine for 5 seconds then quickly open the throttle fully Make sure the engine does not respond sluggishly to increase rpm nor hesitates before picking up speed or even ceases firing 11 If the engine responds sluggishly to increase rpm the mixture is too rich due to the slow speed needle being open too far Close the slow speed needle approx 15 degrees Repeat this procedure until the engine accelerates smoothly Be sure to adjust the slow speed needle only after stopping the engine 12 If the engine hesitates before picking up speed or ceases firing the mixture is too lean due to the slow speed needle being open too far Open the needle approx 15 degrees Repeat this procedure until the engine accelerates smoothly Be sure to adjust the slow speed needle only after stopping the engine Bl Adjustment with flight 13 If the rpm drops or the exhaust sound weakens when vertically climbing from level flight with full throttle the mixture is too lean Land the model and open the high speed needle approx 15 degrees Repeat this procedure until the engine sound is smooth 21 14 If on the other hand exhaust sound is irregular when vertically climbing from level flight the mixture is too rich Land the model and close the high speed needle approx 15 degrees Repeat this procedure until the sound in level flight is steady 15 If the power drops gradually or exhaust sound weakens overhe
25. plied which will results in breaking the lever Before connecting the throttle linkage make sure that the throttle valve lever does not interfere with the bulkhead or mount of the model when it is fully closed and opened In order to obtain suitable idling connect the throttle linkage so that the throttle valve lever may be located at 4 to 5 degrees opened position from fully closed position when the throttle stick on the transmitter is fully pulled down and the throttle valve may be fully closed when the throttle stick as well as the rim lever on the transmitter are fully pulled down or engine cut off mixing is operated Throttle Valve Lever 11 Throttle Valve Lever Retaining Screw CARBURETOR PARTS NAME Fuel Inlet Choke Valve Lever Retaining Screw Choke Valve Lever CARBURETOR LINKAGE Connect the linkage so that the throttle valve is fully opened when the throttle stick on the transmitter is fully advanced Adjust the movement so that the pushrod does not bind when the throttle valve is fully closed and fully opened Connect the linkage so that the servo arm and pushrod and throttle valve lever make a right angle when the throttle stick on the transmitter is placed at mid position to avoid differential action When changing the throttle valve lever and choke valve lever direction loosen and tighten each retaining screw placing each lever at mid position If the throttle valve lever
26. s Keep the propeller pointed away from you and walk well clear of spectators e Switch off the ignition module to stop the engine or fully close the throttle valve via the transmitter to shut off the fuel supply Otherwise there is a possibility of injury e Immediately after the engine is stopped the engine may start with a crank even when the igniter switch is off Do not crank the engine or there is a possibility of injury e Be sure to install an externally operable switch for the ignition system battery to stop the engine if it is started unintentionally with the radio transmitter turned off or there is the possibility of injury e Connect the throttle linkage so that the engine can be stopped via radio operation Always check the throttle linkage If it is disconnected throttle action becomes uncontrollable which may result in a serious accident Take care that loose clothing ties shirt sleeves scarves etc do not come into contact with the propeller Do not carry loose objects such as pencils screwdrivers etc in a shirt pocket from where they could fall through the propeller arc Use an electric starter for this engine The wearing of safety glasses is also strongly recommended If you try hand starting be sure to use a chicken stick or heavy glove Never attempt to start the engine with a bare hand Be sure to carry out adjustments of the high speed needle and slow speed needle after stopping the engin
27. tart the engine before installing it in the model or there is a possibility of injury e Be sure to use an effective silencer muffler Frequent exposure to an open exhaust may eventually impair your hearing Such noise is also likely to cause annoyance to others over a wide area e Mount the engine in your model securely following the manufacturers recommendations e For their safety keep all onlookers especially small children well back at least 10 meters when preparing your model for flight e When checking a spark plug with the power source on do not hold the plug plug cap high tension cord or you will get a shock e Install a top quality propeller of the diameter and pitch specified for the engine and aircraft e Discard any propeller which has become split cracked nicked or otherwise rendered unsafe Never attempt to repair such a propeller destroy it Do not modify a propeller in any way Install the propeller on the shaft so that the curved face of the blades faces forward i e in the direction of flight Firmly tighten the propeller washer and propeller installing screws using the correct size wrench Always check the tightness of propeller installing screws and retighten them if necessary before starting the engine Also check the tightness of all the screws and nuts before restarting the engine e If you have to carry the model to the take off point with the engine running be especially cautiou
28. ter 19 ll Starting with a Chicken stick or gloved hand It is suggested to use an electric starter for safety 1 Turn on the transmitter switch Turn on the receiver switch Turn on the ignition switch f U Nm Open the choke valve fully 5 Pull down the throttle stick on the transmitter fully or to the 1 8 opened position 2 to 3 clicks 6 Flip the propeller until the fuel reach the carburetor and you hear explosion several times 7 Open the choke valve fully 8 Tell the helper and onlookers that you will start the engine now and have the helper hold the model securely 9 Flip the propeller with a Chicken stick to start the engine Usually the engine starts with 2 to 3 flips Note If you have only short runs or the engine does not start with more than 5 flips most probably priming is not sufficient Remove the plug to check if it is wet If it is wet replace it or wait until it becomes dry Then flip the propeller quickly 10 times without installing the plug to eject the fuel in the engine Then install the plug and repeat the procedure OS mans The slow speed needle is effective through the high speed range while the high speed needle is not effective in the low speed range Both needles are effective in the mid speed range while the slow speed needle is the most effective Refer to the diagram below More High Needle N Effective Range Fuel Flow Slow Needle Eff

OS ENGINE GT33 Manual

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