In case of 1.5volt dry cell CORRECT GRADUATIONS ON THE BODY For Helicopter Engine Battery leads Fully opened position MAX-37SZ-H RING Approx. It is of vital importance, before attempting to operate Model engine fuel is also highly flammable. After starting the engine, carry out any needle-valve your engine, to read the general 'SAFETY INSTRUCTIONS Keep it away from open flame, excessive readjustments after stopping the rotor by closing the heat, sources of sparks, or anything else Fully closed position AND WARNINGS' in the following section and to strictly to the lowest r.p.m.. Front view Side view adhere to the advice contained therein. which might ignite it. Do not smoke or allow Stop the engine before attempting to make other Top surfaces are in the same plane. anyone else to smoke, near to it. Carburetor Body adjustments to the carburetor. Make sure element glows INCORRECT Also, please study the entire contents of this bright red inside room or shadow. instruction manual, so as to familiarize yourself with Use an electric . The wearing of safety Carburetor Rotor Model engines generate considerable the controls and other features of the engine. glasses is also strongly recommended. Hexagon starting shaft heat. Do not touch any part of your As shown in the sketch, the carburetor has graduation Press the rotor head down securely. This shaft mounted on an electric starting motor SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S.ENGINE engine until it has cooled. Contact with marks. When the triangle mark on the carburetor rotor the (silencer), head or Take care that the glow plug clip or battery leads do is driven into the shaft cup to turn the engine. Remember that your engine is not a " toy ", but a meets the most right mark, throttle is fully closed. When exhaust header pipe, in particular, may not come into contact with rotating parts. highly efficient internal-combustion machine whose Electric starter and starter battery Top surfaces are not Top surfaces are not in the the triangle mark meets the top mark, throttle is fully result in a serious burn. in the same plane. same plane. open. The range is approximately 80 degrees. You may power is capable of harming you, or others, if it is Adjust the throttle linkage so that the engine stops An electric starter is recommended misused. As owner, you, alone, are responsible for when the throttle stick and trim lever on the use other three marks as the reference marking of Never operate your engine in an enclosed space. for starting. Engine does not rest firmly. the safe operation of your engine, so act with transmitter are fully retarded. Alternatively, the throttle opening to your preference when hovering. Model engines, like automobile engines, exhaust discretion and care at all times. If at some future engine may be stopped by cutting off the fuel 12V Battery deadly carbon-monoxide. Run your engine only Starter WARNING! date, your O.S. engine is acquired by another supply. Never try to stop the engine physically. Fuel Re-align the surfaces as necessary Never try to check the triangle mark position while in an open area. Select, by practical tests, the most suitable fuel from among person, we would respectfully request that these Take care that loose clothing (ties, shirt sleeves, the engine is running and rotor is rotating, or you instructions are also passed on to its new owner. the best quality fuels available in your country for helicopter may be hit by rotating rotor which results in serious scarves etc.) do not come into contact with the rotor. use. For the best throttle response, a fuel containing 10% to Make sure that only the under-surfaces The advice which follows is grouped under two injury. Stop the engine and rotor before checking NOTES Do not carry loose objects (such as pencils, 30% nitromethane is preferable. Lubricants may be either of the engine’s mounting lugs are in headings according to the degree of damage or the triangle mark position. screwdrivers, etc.) in a shirt pocket from where they castor-oil or a suitable (or. a blend of both) contact with the engine mount. danger which might arise through misuse or neglect. This engine was designed for model helicopters. could fall through the rotor disc. provided that they are always of top quality. For consistent Do not attempt to use it for any other purpose. STARTING For their safety, keep all onlookers (especially small performance and long engine life, it is essential to use fuel WARNINGS INSTALLING THE GLOWPLUG Be sure to use an electric starter to start the engine. Mount the engine in your model securely, following children) well back (at least 20 feet or 6 metres) when containing AT LEAST 18% lubricant by These cover events which might involve serious the manufacturers' recommendations, using appropriate preparing your model for flight. If you have to carry the volume. Some fuels containing coloring Install washer on glowplug and Be sure to use a muffler pressurized fuel feed. Use (in extreme circumstances, even fatal) injury. screws and locknuts. model to the take-off point with the engine running, be additives tend to deterriorate and may insert carefully into Heatsink-head, the same fuel as you intend to employ for actual making sure that it is not operation of your model. Install an effective silencer (muffler). Frequent close especially cautious. Hold the rotor securely and keep adversely affect running qualities. If in NOTES well clear of spectators. doubt compare to a fuel known to be good. cross-threaded before tightening exposure to a noisy exhaust (especially in the case of firmly. Starting procedure is as follows: These cover the many other possibilities, generally less the more powerful high-speed engines) may eventually Warning! lmmediately after a glowplug-ignition Glow plug 1. Fill the with fuel. When filled, prevent the obvious sources of danger, but which, under certain impair your hearing and such noise is also likely to engine has been run and is still warm, conditions Alternatively, one of the purpose-made Washer fuel from flowing into the carburetor with a circumstances, may also cause damage or injury. cause annoyance to others over a wide area. sometimes exist whereby it is just possible for the manual or electric fuel pumps may be Manual commercially available fuel stopper, etc. Release Check the linkage to the throttle arm before each engine to restart when turned over WITHOUT the used to transfer fuel directly from your fuel the stopper before starting the engine. WARNINGS glowplug battery being reconnected. Remember this container to the fuel tank. flight. 2. Make sure that plug element glows red, and install if you wish to avoid the risk of accidents. O.S. Super Filter (Fuel Can Filter) Never touch, or allow any object to come the plug in the . Avoid sudden high r.p.m. immediately after the Install a filter to the outlet tube of your Electric into contact with, the rotating parts. INSTALLATION OF THE STANDARD ACCESSORIES engine is started, as the clutch will engage and you Element glows when energized. refueling container to prevent entry of INSTALLATION OF THE THROTTLE LEVER may be struck by the rotor. foreign matter into fuel tank. O.S. ‘Super Model engine fuel is poisonous. Do not allow Throttle lever is not installed on the carburetor when the Pliers Filters’ (large and small) are available as it to come into contact with the eyes or mouth. engine leaves the factory. Install it before using the optional extras. Always store it in a clearly marked container engine referring to the sketch below. and out of the reach of children. Retaining Screw It is recommended to install a good Replace the plug when the in-line filter between the fuel tank and element does not glow or is Notes on installing cooling and clutch Linking the throttle servo to the carburetor ENGINE PARTS NAME Washer Glowplug carburetor to prevent entry of foreign burnt out. Link the throttle servo to the carburetor using Heatsink Head matter into the carburetor. Glow Plug Igniter Do not use a tool which the throttle lever supplied. Throttle control rod locks when installing A and B should be equal length. Set the Silicone Fuel Line Throttle Lever Carburetor Heatproof silicone tubing of approx. 5mm o.d. a cooling-fan and clutch, or linkage so that the servo output lever and 1. Opening and closing of the Needle-Valve top of the piston may be throttle lever are parallel when the throttle Type 20M and 2.5mm i.d. is required for the connection damaged. Also, do not insert stick on the transmitter is at middle position. between the fuel tank and engine. Turn the needle clockwise to CARBURETOR CONTROLS close the needle-valve, and turn Close a screw driver or the similar Installing hole intervals on the F lever and on Cover Plate TOOLS into the exhaust port. the J lever are different. Decide the lever to With a fixed-wing model, power failure is rarely a the needle counter-clockwise to Hex Drivers Necessary for engine installation. serious threat to the safety of the aircraft since it can open the needle-valve as shown use according to the servo used. Be sure to 1.5mm, 2mm, 2.5mm, 3mm It is recommended to use cut off another lever to avoid any interference. usually glide down to a safe landing. In a helicopter, on in the sketch. Open Clamp 37 (Code B the other hand, it is vitally imporant that the engine No.71530600) available as an Thrust Washer Phillips Screwdriver keeps running and that there is a quick and reliable 2. Opening the needle-valve optional tool. No.1, No.2, etc. 90° Crankshaft response to the throttle in order to ensure safe ascent Firstly, turn the needle clockwise slowly until it 90° and descent of the model. Do not grip the engine mounting beams with a Beam Mount stops. The position it stops is the fully closed F Screwdriver Necessary for carburetor adjustments. position of the needle-valve. Make note this position vise, or the will be distorted which Crankcase No.1, No.2, etc Two adjustable controls are provided on this carburetor. J J for reference.. 27 will result in engine breaking. 33 nut The Needle Valve: F Open the needle-valve 1.5 turns. Socket Drivers When set to produce maximum power at full throttle, Rotor Guide Screw 3. Preparation of the starter A 5mm, 5.5mm, 7mm this establishes the basic fuel/air mixture strength. Vise Install the starting shaft to the 28 This is then maintained by the carburetor's automatic A=B 34 Mixture Control Valve Long Socket Wrench With Plug Grip mixture control system to cover the engine's starter securely. Poor installation Recommended for easy removal and replacement of requirements at reduced throttle settings. swings the starting shaft, which is Fuel Inlet the angled and recessed glowplug, the O.S.Long The Mixture Control Valve dangerous. Beam Mount INTRODUCTION Throttle Lever Socket Wrench incorporates a special grip. This is a high performance engine designed for For adjusting the mixture strength at part-throttle and small-sized radio-controlled helicopters. Carburetor 8mm idling speeds, to obtain steady idling and smooth NOTES WHEN APPLYING AN ELECTRIC STARTER Since the mounting bolt pattern of the engine as Needle Valve acceleration to medium speeds. The Mixture Control Because of this initial tightness, a standard well as silencer is the same as those of the 32SX-H, Valve has been factory set for the approximate best 4. Checking the rotating direction of the starter result. First, run the engine as received, and Make sure that the starter rotates electric starter may have difficulty in rotating the it can be directly replaced with the 32SX-H and most BEFORE STARTING End Wrenches engine when cold, before it has been adequately re-adjust the Mixture Control Valve only when to the direction shown in the of other 32-39 size engines. This powerful engine is Tools, accessories, etc.The following items are necessary 8mm, 13mm, 14mm, etc. run-in. In this case, use a high-torque type starter. suitable for sport flight as well as 3D flight. for operating the engine. necessary. sketch. If the direction is reverse, reverse the leads on battery. Do not over-prime. This could cause a hydraulic With some models, needle interferes the body and Items necessary for starting Needle Nose Pliers REALIGNMENT OF MIXTURE CONTROL VALVE lock and damage the engine on application of the working on the body to avoid this would be required. Battery leads electric starter. In the course of making carburetor adjustments, it is These are used to conduct current from INSTALLATION OF THE ENGINE just possible that the Mixture Control Valve may be If over-primed, remove glowplug, close needle-valve STANDARD ACCESSOIES the battery to the glowplug. Basically, two The under-surfaces of all O.S. engine beam mounting inadvertently screwed in or out too far and thereby and apply starter to pump out surplus fuel. Cover leads, with clips, are required, but, for lugs are precision machined flat and exactyly parallel moved beyond its effective adjustment range. the head with a rag to prevent pumped out fuel greater conve-nience, twin leads with to the engine's horizontal axis. It is essential that the 5. Inserting the starter shaft Glow Plug No.8 Battery leads Its basic setting can be reestablished as follows : from getting into your eyes. O.S. No.8 glowplug is special glowplug connectors, as shown on engine mounts in the model are also accurately made Insert the starting shaft into the supplied with the engine the right, are commercially available. and aligned. If they are not, they will cause stress and 0.5mm First rotate the Mixture shaft cup securely. distortion within the engine itself, probably resulting in Control Valve until its slotted Glowplug battery loss of performance and internal damage. head is flush with the Throttle Lever Assembly The power source for heating the glowplug may be The recommended screws for securing the engine to carburetor body. Then screw either a large heavy-duty 1.5volt dry cell, Ni-cd battery the valve in exactly 1 turn. the engine mounts in the model are 3mm or 4-40 steel This is the standard position. or glowplug Igniter. Allen type. It is also advisable to use lock washers or LOCTITE to prevent nuts from loosening. NOTE Make sure that only the under-surfaces of the engine’s 6. Priming 1.5 volt dry cell Throttle lever is not installed on the carburetor mounting lugs are in contact with the engine mount. Without heating the glowplug, open the throttle a little from the idle position. Turn the engine using when the engine leaves the factory. glowplug Igniter Please note that crankcase volume of the 37SZ-H is a Mixture Control Valve Install it before using the engine. little larger than the 32SX-H’s. If the crankcase body Carburetor Body the starter until the fuel is seen to reach carburetor. touches the mount, chamfer the edges of the mount. 7. Preparation of starting C Warm the engine by allowing it to idle for about 30 SUBSEQUENT READJUSTMENTS When the engine is not to be used for some months ENGINE EXPLODED VIEW ENGINEN PARTS LIST Make sure that the transmitter seconds. If the engine stops, advance the throttle Once the engine has been run-in and the carburetor (for example, as between flying seasons), a No. Code No. Description throttle stick is at the fully closed trim lever slightly to increase the idle rpm. Then controls properly set up, it should be unnecessary to worthwhile precaution is to remove it from the position and the throttle trim at open the throttle sufficiently to 'float' the model alter the mixture settings, except to make minor airframe and, after washing off the exterior with C.M3x15 1 23414300 Heatsink Head center position, and make sure above the ground. adjustments to the Needle Valve occasionally, to take alcohol (not gasoline nor kerosene), remove 2 23413100 Cylinder Liner that idle-up switch on the carefully the carburetor with pipe, glow plug D lf, at this time, the engine is slow to pick up and account of variations in climatic condisitions. 3 25403400 Piston Ring transmitter is off. Hold the rotor and all silicone tubing and put them safely aside. produces an excess of exhaust smoke, the mixture The use of a different fuel, however, particularly one head by hand so that rotor cannot Then, immerse the engine in a container of alcohol. 4 23413200 Piston is too rich. Correct this condition by turning the containing more, or less, nitromethane and / or a 1 rotate when the engine is Started. Rotate the crankshaft while the engine is immersed. 5 23406000 Piston Pin Mixture Control Valve clockwise. lf the mixture is different type or proportion of lubricating oil, is likely to 0.2mm 17 Also, steady the model with a foot If foreign matter is visible in the alcohol, rinse the Piston Pin Retainer (2pcs.) extremely rich, engine rpm will become unstable : call for some readjustment of the Needle-Valve. 6 24517000 on the landing-gear skid. Remember that, as a safety measure, it is advisable to engine again in clean alcohol. Finally, shake off and 7 23415000 opening the throttle will produce a great deal of dry the alcohol ,and inject some after-run oil in the 8. Starting smoke and rpm may drop suddenly or the engine increase the Needle Valve opening by an extra 8 23483000 Carburetor Complete (20M) half-turn counter-clockwise, prior to establishing a new glowplug hole and rotate the crankshaft several Connect the battery to the glowplug and start the may stop. This condition may also be initiated by an 2 9 23210007 Propeller Nut setting. The same applies if the silencer type is times by hand. Reinstall the carburetor with intake 15 engine by applying the starter. When started, excessively prolonged warming-up period. changed. A different silencer may alter the exhaust pipe and glowplug on the engine and keep it in a dry 10 22620003 Thrust Washer switch off the starter and withdraw the starting shaft E lf, on the other hand, the mixture is too Iean, this wiIl pressure applied to the fuel feed and call for a revised place after putting in a vinyl bag. C.M2.6x7 Crankshaft Bearing (Front) after making sure the rotation of the starter shaft 3 11 22831000 be indicated by a marked lack of exhaust smoke Needle-Valve setting. stops. 12 23411000 Crankcase and a tendency for the engine to cut out when the The use of a different glowplug, or changes to the O.S. GENUINE PARTS & ACCESSORIES 5 Crankshaft Bearing (Rear) throttle is opened. ln this case, turn the Mixture mainrotor and its pitch angles may also require 13 23730000 9. Stopping the engine GLOWPLUG 4 Control Valve counter-clockwise to enrich the compensating carburetor readjustments. 14 23412000 Crankshaft Fully pull down the throttle trim on the transmitter. (71607100) No.8 (71608001) 6 mixture. No.7 15 23424000 Gasket Set Note: CARBURETOR CLEANLINESS F Turn the Mixture Control Valve 15 degrees at a No.10 (Former A5) (71605100) 7 16 23427000 Cover Plate The correct functioning of the carburetor depends on its 16 Make sure that the throttle linkage is made so that time. the throttle is fully closed when the throttle lever small fuel orifices remaining clear. The minute particles CRANKSHAFT CLAMP 37 17 23411300 Screw Set as well as trim lever on the transmitter are fully G Having provisionally set the idle mixture, the next of foreign matter that are present in any fuel can easily (71530600) 29085140 Throttle Lever Assembly pulled down. step is to adjust the mixture for hovering flight. partially obstruct these orifices and upset mixture 8 71608001 Glow Plug No.8 strength so that engine performance becomes erratic SUPER FILTER (L) 14 In case the engine does not stop. H Hover the model and actuate the throttle to observe The specifications are subject to alteration for improvement without notice. response over the medium speed range. lf the and unreliable. It is recommended that fuel is passed (72403050) Hold the rotor head, and pinch the silicone tube to stop engine smokes excessiveIy and throttle response is through a filter when the tank is filled and that a good CAP SCREW SETS (10pcs./sets) the fuel supply. If it still does not stop, pull off the fuel NON-BUBBLE WEIGHT N.+M3.5X5 13 poor, the mixture is too rich ; in which case, land Code No. Size Pcs. used in an engine tubing from the carburetor. It is necessary to readjust in-line filter is installed between the fuel tank and (S) (71531010) the model and turn the Needle Valve clockwise. Do 79871020 M2.6x7 Cover Plate Retaining Screw (4pcs.) the throttle linkage so that the carburetor rotor is fully carburettor and, furthermore, that this filter is frequently not close the NeedIe Valve too much, keeping it a LOCK WASHER (10set) closed when the throttle stick and throttle trim on the cleaned to remove dirt and lint that accumulates on the 12 79871150 M3x15 Cylinder Head Retaining Screw (4pcs.) little on the rich side at this stage. filter screen. Finally, occasionally remove the M3 (55500002) Type of screw transmitter are fully pulled down. 10 11 needle-valve holder from the carburetor as shown in 9 I lf, on the other hand, hovering is not stable and O.S. SPEED CILICONE TUBE C…Cap Screw N…Round Head Screw NOTE: Photo and extract any remaining foreign matter that response to the throttIe is over-sensitive, or if the (72506100) 2.5mm x 1000mm If the throttle response is poor or the engine stops engine tends to overheat, this indicates that the may have lodged in the location shown in right. due to a temporarily over-rich mixture immediately mixture is too lean and should be corrected by O.S. SPEED MAINTENANCE OIL after the engine is started, pinch the fuel line for Remove this with Dirt and fbrous matter CARBURETOR EXPLODED VIEW CARBURETOR PARTS LIST turning the Needle Valve counter-clockwise. mostly accumulate here one or two seconds until the engine r.p.m. an 8mm spanner (71430010) C.M3x8 No. Code No. Description increase and the engine runs steadily. J When satisfactory hovering flight has been achieved, LONG SOCKET WRENCH WITH PLUG GRIP Type of screw land the modeI again and re-check the engine's idle 1 29085140 Throttle Lever Assembly (71521000) C…Cap Screw N…Round Head Screw RUNNING-IN ("Breaking-in") qualities. 1-1 22826131 Throttle Lever Retaining Screw (2pcs.) All internal-combustion engines benefit, to some O.S. SPEED PISTON PIN RETAINER PLIERS 2 23483200 Carburetor Rotor K After about 10 seconds of idling, open the throttle to 1-1 degree, from extra care when they are run for the first 'float' the model. lf the transition is smooth, the idle (71492000) 3 23483100 Carburetor Body few times known as running-in or breaking-in. mixture is O.K. If the symptoms of either rich or Iean The specifications are subject to alteration for improvement 4 45581820 Rotor Guide Screw 1 This allows the working parts to mate together under running are observed, readjust the Mixture Control without notice. 2 5 5 27081900 Needle Valve Assembly load at operating temperature. Screw accordingly. CARE AND MAINTENANCE 4 Please pay attention to the matters described 3 5-1 27981910 Needle Assembly However, because O.S. engines are made with the aid Now adjust the Needle Valve to achieve the best 5-3 L below to ensure that your engine serves you well 5-1 5-2 24981837 "O" Ring (2pcs.) of the finest modern precision machinely and from the performance when the model is flying at full throttle. in regard to performance, reliability and long life. best and most suitable materrials, only a very short lf, at full throttle, acceleration is poor, the exhaust 5-6 5-3 46181940 Needle Valve Holder Assembly and simple running-in procedure is required and can unduly smoky and the model fails to reach As previously mentioned, it is vitally important to 5-4 46181941 Needle Valve Holder be carried out with the engine installed in the model. expected straight line speed, the mixture is too rich avoid operating the engine in conditions where dust, 5-4 5-5 5-5 26711305 Ratchet Spring and the Needle Valve setting will need to be disturbed by the propeller, may be deposited on the 5-2 For the first few flights with a new engine i.e. while the 5-6 46181950 Fuel Inlet (w/Gasket) reduced. lf, however, after smoothly acceIerating to engine and enter its working parts. N.+M3.5x5 engine is being run-in set the needle-valve for a slightly 6 21285600 Mixture Control Valve Assembly satisfactory high-speed straight and level flight, 6-2 rich mixture not excessively rich as this may result in Remember to keep your fuel container closed to 6-1 power is lost when the model is puIled up into a 6-1 46066319 "O" Ring (L) (2pcs.) poor throttle response and cause the engine to stop. prevent foreign matter from contaminating the fuel. climb, the mixture is too lean. ln this case, land the 7 6-2 22781800 "O" Ring (S) (2pcs.) About one half turn open from the nomal setting will 6 model immediately and readjust Needle Valve to a Install a fuel filter to prevent foreign matter in 7 22615000 Carburetor Rubber Gasket usually suffice. richer setting. the fuel container from entering the fuel tank. O.S. 8 8 23081706 Carburetor Retaining Screw (2pcs.) Super Filters (L) and (S) are available as optional M Now re-check hovering performance and, if necessary, ADJUSTMENT CAP SCREW SETS (10pcs./sets) The specifications are subject to alteration for improvement without notice. fine-tune the mixture for hovering flight. extras. The following adjustments are approximately correct Code No. Size Pcs. used in an engine Install an in-line fuel filter between the tank and when using a fuel containing 18-25% lubricant and N For helicopters, good throttle response at medium 79871110 M3x8 Throttle Lever Retaining Screw (1pc.) 10-30% nitromethane. r.p.m. (e.g.hovering speeds) is most important, since carburetor to prevent foreign matter in the tank from Bear in mind that fuels containing relatively large this is a power range widely used in helicopter flight. entering the carburetor. percentages of power-boosting nitromethane operate The optimum fuel/air mixture strength at medium Clean these filters periodically. THREE VIEW DRAWING Dimensions (mm) at richer mixture settings than are needed for mild speeds is dependent on obtaining balanced If these precautions are neglected, restriction of fuel 7.5 7.5 fuels and will, therefore, require the Needle Valve to adjustment of both the Needle Valve and the Mixture flow may cause the engine to cut out, or the fuel/air SPECIFICATIONS be readjusted accordingly. The type and percentage of Controlof both the Needle Valve and the Mixture mixture to become too lean causing the engine to lubricant used is also a factor here, as noted later in Control Valve. lf both controls are already at their overheat. Displacement 6.07 cc / 0.370 cu.in. these instructions. optimum setting, some modification to these settings 20.5 mm / 0.806 in. The use of modern high-performance alcohol based may be necessary to achieve satisfactory mid-range 18.4 mm / 0.725 in. 38 This carburetor is not equipped with a throttle model engine fuels, while promoting cooler running, throttle response, but such readjustments should Output 1.4 ps / 1.38 hp / 18,000 r.p.m. stop screw. Instead, idle speed is adjusted by improved anti-detonation combustion and increased onIy be made within the range where idle reliability Practical R.P.M. 2,000-21,000 r.p.m. means of the throttle trim lever on the transmitter. power, have the disadvantage of causing corrosion and high-speed performance are not unduly Weight 293 g / 10.34 oz. (Engine) due to the acid by-products of combustion. A This enables the full r.p.m. range, from idling to full compromised. Readjustments should therefore be The use of nitromethane in the fuel can also power, to be controlled by the throttle stick, and carried out as follows: 42 contribute to the problem. 50 then allows the engine to be stopped, from the O lf the mid-range throttle response is not rapid and 18 35 Do not close the needle-valve and mixture control transmitter, by closing the throttle completely with positive (indicating a rich mid-range mixture), turn valve too far as this will cause a lean setting and the trim lever. the Needle Valve 2 or 3 clicks clockwise, or turn the over heating of the engine. This can, in turn, create Mixture Control Valve 1-3 degrees cIockwise. Set up the throttle linkage as follows: nitromethane oxide leading to internal rusting of the With the transmitter throttle trim lever fully retarded, P lf, on the other hand, the response to mid-range engine. Always adjust the needlevalve slightly on the adjust the throttle servo linkage so that the throttle throttle movement is too sensitive (indicating a lean rich side of peak rpm. 61 rotor is (a) fully open when the transmitter throttle mid-range mixture), turn the Needle Valve 2 or 3 Do not leave unused fuel in the engine at the stick is fully advanced and (b) fully closed (i.e. clicks counter-clockwise or turn the Mixture Control 1/4-28UNF 30.8 engine stopped) when the stick is fully retarded. Valve 1-3 degrees counter-clockwise. conclusion of a day’s flying. Accepted practice is to The idle speed is then set by advancing the throttle cut off the fuel supply while the engine is still running Throttle response at hovering speeds is aIso affected trim lever to the point where the engine runs, Q at full throttle, then expel as much fuel residue as 15.8 by the reIationship of the main rotor pitch angle to steadily and reliably,at the desired idle speed. possible by turning the engine over 5-10 seconds 30.6 throttle opening. If the optimum mid-range throttle with the electric starter. 45 45.9 21.3 B As a safety measure, first check the transmitter response cannot be obtained by the carburettor Finally, inject some after-run oil through the glowplug controls, including the throttle stick and trim lever adjustments described above, try adjusting the hole and turn the engine over several times by hand. positions, and hold the main rotor securely before helicopter's pitch control characteristics. 6-15 3-Chome Imagawa Higashisumiyoshi-ku starting the engine. Osaka 546-0003, Japan TE L . (06 ) 6702-0225 http://www.os-engines.co.jp FAX. (06) 6704-2722 C Copyright 2013 by O.S. Engine Mfg. Co., Ltd. All rights reserved. Printed in JAPAM. 60092830 072102