OS ENGINES 91HZ-R 3D Helicopter Engine Instruction Manual

OS ENGINES 91HZ-R 3D Helicopter Engine

It is of vital importance, before attempting to operate your engine, to read the general ‘SAFETY INSTRUCTIONS AND WARNINGS’ in the following section and to strictly adhere to the advice contained therein.

•  Also, please study the entire contents of this instruction manual, so as to familiarize yourself with the controls and other features of the engine.

SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S.ENGINE
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. 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.

• The advice which follows is grouped under two headings according to the degree of damage or danger which might arise through misuse or neglect.

WARNINGS

• These cover events which might involve serious (in extreme circumstances, even fatal) injury.

NOTES
These cover the many other possibilities, generally less obvious sources of danger, but which, under certain circumstances, may also cause damage or injury.

WARNINGS
Never touch, or allow any object to come a into contact with, the rotating parts.

Model engine fuel is poisonous. Do not allow it to come into contact with the eyes or mouth. Always store it in a clearly marked container and out of the reach of children. Model engine fuel is also highly flammable. Keep it away from open flame, excessive heat, sources of sparks, or anything else which might ignite it. Do not smoke or allow anyone else to smoke, near to it. Model engines generate considerable heat. Do not touch any part of your engine until it has cooled. Contact with the muffler (silencer), cylinder head or exhaust header pipe, in particular, may result in a serious burn.

• 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.

NOTES

• This engine was designed for model helicopters. Do not attempt to use it for any other purpose.
• Mount the engine in your model securely, following the manufacturers’ recommendations, using appropriate screws and locknuts.
• Install an effective silencer (muffler). Frequent close exposure to a noisy exhaust (especially in the case of the more powerful high-speed engines) may eventually impair your hearing and such noise is also likely to cause annoyance to others over a wide area.
• Check the linkage to the throttle arm before each flight.
• Avoid sudden high r.p.m. immediately after the engine is started, as the clutch will engage and you may be struck by the rotor.
• After starting the engine, carry out any needle-valve readjustments after stopping the rotor by closing the throttle to the lowest r.p.m .. Stop the engine before attempting to make other adjustments to the carburetor.
• Use an electric starter. The wearing of safety glasses is also strongly recommended. Press the rotor head down securely.
• Check for glow plug clip and battery leads, do not come into contact with rotating parts.
• Adjust the throttle linkage so that the engine stops when the throttle stick and trim lever on the transmitter are fully retarded. Alternatively, the engine may be stopped by cutting off the fuel supply. Never try to stop the engine physically.
• Check for loose clothing (ties, shirt sleeves, scarves etc.) do not come into contact with the rotor. Do not carry loose objects (such as pencils, screwdrivers, etc.) in a shirt pocket from where they could fall through the rotor disc.
• For their safety, keep all onlookers (especially small children) well back (at least 20 feet or 6 metres) when preparing your model for flight. If you have to carry the model to the take-off point with the engine running, be especially cautious. Hold the rotor securely and keep well clear of spectators.
• Warning! Immediately after a glow plug-ignition engine has been run and is still warm, conditions sometimes exist whereby it is just possible for the engine to restart when turned over WITHOUT the glowplug battery being reconnected. Remember this to avoid the risk of accidents.

INTRODUCTION
This is the O.S. SPEED version of the 91 HZ-R developed exclusively for the 3D flights. It is quipped with DRS (Demand Regulator System) ensuring an always steady fuel supply which demands repeated vigorous attitude changes for 3D flights.

The 61G carburetor is equipped with twin needles which enable adjustment of the idling/hovering and high speed mixture independently. Additionally, when using the governor function using a Futaba gyro, the cover plate mounting sensor BPS-1 can be installed. By Equipping the governor function, it makes the flight even more stable.

ENGINE PARTS NAME

Standard accessories

• O.S. No.a glow plug is supplied  with the engine
• Check Valve
• Head Gasket (0.2mm)

NOTE: As delivered, the engine has the carburetor lightly fit into the intake. Secure it changing the angle according to the model.

Notes on installing cooling fan and clutch

• Do not use a tool which locks piston when installing a cooling-fan and clutch, or top of the piston maybe damaged. Also, do not insert a screw driver or the similar into the exhaust port.
• It is recommended to use Crankshaft Clamp 91/105/GT15 (Code No.71530530) available as an optional tool.
• With this engine, the cover plate cannot be removed when the piston is at BDC due to engine construction.
• When it is required to remove the cover plate, be sure to position the piston at TDC.
• Do not grip the engine mounting beams with a vise, or the crankcase will be distorted which will result in engine breaking.

Linking the throttle servo to the carburetor

Link the throttle servo to the carburetor using the throttle lever supplied. Throttle control rod A and B should be equal length. Set the linkage so that the servo output lever and throttle lever are parallel when the throttle stick on the transmitter is at middle position. Installing hole intervals on the F lever and on the J lever are different. Decide the lever to use according to the servo used. Be sure to cut off another lever to avoid any interference.

NOTES WHEN APPLYING AN ELECTRIC STARTER
Because of this initial tightness, a standard electric starter may have difficulty in rotating the engine when cold, before it has been adequately run-in. In this case, use a high-torque type starter. Do not over-prime. This could cause a hydraulic lock and damage the engine on application of the electric starter. If over-primed, remove glow plug, close needle-valve and apply starter to pump out surplus fuel. Cover the head with a rag to prevent pumped out fuel from getting into your eyes.

Note on heating the glow plug
The heatsink head on the engine is treated with an anodized finish which does not conduct current. Therefore, when heating a glow plug, connect one lead to the glow plug and the other to the head or cover plate retaining screw.

BEFORE STARTING
Tools, accessories, etc.The following items are necessary for operating the engine.

Items necessary for starting

• Fuel
  Select, by practical tests, the most suitable fuel from among the best quality fuels available in your country for helicopter use. For the best throttle response, a fuel containing 10% to 30% nitromethane is preferable. Lubricants may be either castor-oil or a suitable synthetic oil (or. a blend of both) provided that they are always of top quality. For consistent performance and long engine life, it is essential to use fuel containing ATLEAST 18% lubricant by volume. Some fuels containing coloring additives tend to deterriorate and may adversely affect running qualities. If in doubt compare to a fuel known to be good.

• O.S. Super Filter (Fuel Can Filter)
  Install a filter to the outlet tube of your refueling container to prevent entry of foreign matter into fuel tank. 0.8. ‘Super Filters’ (large and small) are available as optional extras.

• Battery leads

• Glowplug battery

• Hexagon starting shaft

• Electric starter and starter battery

• Fuel Pump

• Fuel Filter

• Silicone Fuel Line

TOOLS

• Hex Drivers
• Phillips Screwdriver
• Screwdriver
• Socket Drivers
• 0.S. SPEED Plug Wrench (optional extra)
• End Wrenches
• Needle Nose Pliers

INSTALLING THE GLOWPLUG
Install washer on glow plug and insert carefully into Heatsink-head, making sure that it is not cross-threaded before tightening firmly.

INSTALLATION OF THE STANDARD ACCESSORIES

• Installation of Velocity Stack
  Install the velocity stack supplied on the carburetor with M3x3 set-screw supplied. Cut out the cooling fan duct so that velocity stack man not interfere the duct. The velocity stack develops its performance when it is completely located inside the duct.

• About The Head Gasket
  The engine is installed with a 0.1 mm thick head gasket from the factory. When a 15% nitro fuel is used, run the engine as it is. But when a 30% nitro fuel is used, replace the 0.1 mm gasket with a 0.2mm thick gasket supplied or just add the 0.2mm thick gasket for easier tuning.

INSTALLATION OF THE ENGINE
The under-surfaces of all 0.8. engine beam mounting lugs are precision machined flat and exactyly parallel to the engine’s horizontal axis. It is essential that the engine mounts in the model are also accurately made and aligned. If they are not, they will cause stress and distortion within the engine itself, probably resulting in loss of performance and internal damage. The recommended screws for securing the engine to the engine mounts in the model are 4mm or 4-40 steel Allen type. It is also advisable to use lock washers or LOCTITE to prevent nuts from loosening.

Make sure that only the under-surfaces of the engine’s mounting lugs are in contact with the engine mount.

INSTALLATION OF THE CARBURETOR
As delivered, the engine has its carburetor lightly fitted into its intake boss. Secure it as follows.

1. Loosen carburetor retainer screw slightly.

2. Insert the carburetor rubber gasket on the carburetor body securely. Then, insert the carburetor in the crankcase.
   Note : In case it is hard to insert the carburetor in the crankcase, apply oil on the Thermo lnsulater. Do not force it, or damage to the Thermo lnsulater and/or crankcase can occur.

3. Rotate the retainer screw gently until it stops, then tighten a further 90-120 degrees. Do not over-tighten the screw as this will damage the Thermo lnsulater.

ABOUT THE REGURETOR CARE OF REGURETOR

• NEVER disassemble the pressure regulator. Their original performance may not be restored after reassembly.
• NEVER insert anything into the inlet nipple in an attempt to clear a suspected obstruction.
• DO NOT block the five holes on the top of the regulator, or the regulator may not work properly. Do not insert a needle or anything into these holes.
• DO NOT allow foreign matter to enter the fuel system. Dirt inside the regulator, no matter how small, may obstruct the flow of fuel and prevent a from working properly.

• ALWAYS use fuel filters. Keep the fuel tank scrupulously clean and filter all fuel as it enters the tank (e.g.via an O.8.’Super-Filter’ Code No.72403050) and use a good quality in-line filter between the tank and regulator. Remember to inspect filter screens at regular intervals and rinse clean as necessary.
• DO NOT clean the regulator with organic solvent such as kerosene, light machine oil, gasoline, thinner or ere as the silicone rubber parts inside will deteriorate. Be sure to use methanol or fuel.
• DO NOT allow fuel to remain in the regulator. After finishing the day’s flight session, be sure to run out the fuel in the regulator. Stop the fuel flow to the regulator with a stopper and run the engine at idle to use up the fuel in the regulator. After stopping the engine, rotate the engine by electric starter to eliminate fuel inside the engine.

ABOUT THE SILENCER AND PLUMBING

• It is suggested to use the 0.8. PowerBoost 105 silencer which is developed to best Match the 105HZ-R. Also, the conventional silencers designed for 90 size engines can be used too.
• In this case, install the silencer screwing in the M4x15 bolts from the silencer side since the crankcase has been tapped to accept the bolts is done on the crankcase. Carry out plumbing referring to the instructions supplied with the silencer.
• Carry out plumbing referring to a sketch.
• Connect silicone tubing cut into approx. 10cm to the nipple on the cover plate.
• Then, connect the check valve supplied with the engine as sketched (Be aware of the direction.) It is suggested to install a stopper as shown in the sketch.
• When refueling, remove this stopper to release pressure in the fuel tank.
• Connect the fuel line to the nipple on the regulator.
• Be sure to equip a commercially available in-line filter to avoid dust entering the regulator.

Note : Since the muffler pressurized fuel feed is not used with this engine, plug the nipple on the muffler or replace it with a bolt.

CARBURETOR CONTROLS
With a fixed-wing model, power failure is rarely a serious threat to the safety of the aircraft since it can usually glide down to a safe landing. In a helicopter, on the other hand, it is vitally imporant that the engine keeps running and that there is a quick and reliable response to the throttle in order to ensure safe ascent and descent of the model. Three adjustable mixture controls are incorporated in the Type 61G. They are as follows.

• A. The High-Speed (Main) Needle Valve
  When set to produce maximum power at full throttle, this establishes the basic fuel/air mixture strength. This is then maintained by the carburetor’s automatic mixture control system to cover the engine’s requirements at reduced throttle settings.

• B. The Idle Mixture Control Screw
  This provides the means of manually adjusting the mixture control valve. By setting the Mixture Control Screw for the best idling performance, the mixture control valve automatically ensures that fuel is accurately metered to maintain the correct mixture strength as the throttle is opened.

• C. The Medium Speed Needle Valve
  This is an extra control that can be brought into play, if necessary, after adjusting A and B above. It provides the means of fine-tuning mixture strength over that all-important part of a helicopter’s throttle range where the model is flying in, or near, the hovering mode.

NOTE : As the idle mixture control screw is installed with LOCTITE, ii may initialy feel stiff, and ii is suggested to use a slightly oversized screwdriver. The screw can be turned only 90 degrees either way. Do not force to turn further, or ii may break or cause trouble.

BASIC POSITION OF MIXTURE CONTROL SCREW (Mixture Control Valve)
As delivered, the Mixture Control Screw is positioned at approximately the center as shown in the sketch. Mixture gets lean when the Mixture Control Screw is turned right, while mixture gets rich when the Mixture Control Screw is turned left.With a model helicopter,adjustments vary with combined various factors such as climatic conditions, fuel, muffler, main rotor, weight of the model, gear ratio, etc. Therefore the Mixture Control Screw position varies with each model and set- up, and it is normal if the Mixture Control Screw position is off the center.

GRADUATIONS ON THE CARBURETOR BODY
As shown in the sketch, the carburetor has graduation marks.

When the triangle mark on the carburetor rotor meets the far right mark, the throttle is fully closed. When the triangle mark meets the top mark, the throttle is fully open. The range is 89 degrees. You may use the other three marks as the reference marking of throttle opening to your preference when hovering.

WARNING!
Never try to check the triangle mark position while the engine is running and rotor is rotating, or you may be hit by rotating rotor which results in serious injury. Stop the engine and rotor before checking
the triangle mark position.

STARTING

Be sure to use an electric starter to start the engine.

Starting procedure is as follows:

1. Fill the fuel tank with fuel. When filled, prevent the fuel from flowing into the carburetor with a commercially available fuel stopper, etc.
2. Make sure that plug element glows red, and install the plug in the cylinder head.

1. Opening and closing of the Needle-Valve
   Turn the needle clockwise to close the needle-valve, and turn the needle counter-clockwise to open the needle-valve as shown in the sketch.

2. High Speed needle-valve:
   approx. two half turns open from the fully closed position. (Note: If a different muffler is used, this setting may require readjustment)

   • Idle Mixture Control Screw:
     at basic position when the engine leaves the factory.

   • Medium Speed needle-valve:
     one turn open from the fully closed position.

3. Preparation of the starter
   Install the starting shaft to the starter securely. Improper installation will allow the shaft to swing creating a dangerous situation.

4. Checking the rotating direction of the starter
   Make sure that the starter rotates to the direction shown in the sketch. If the direction is reverse, reverse the leads on battery.

5. Inserting the starter shaft
   Insert the starting shaft into the shaft cup securely.

6. Priming
   Check the movement of all the controls after switching on both the transmitter and the receiver. Then, fully open the throttle valve without heating the plug. Turn the engine with an electric starter until the fuel comes into the carburetor inlet.

7. Preparation of starting
   Make sure that the transmitter throttle stick is at the fully closed position and the throttle trim at center position, and make sure that idle-up switch on the transmitter is off. Hold the rotor head by hand so that rotor cannot rotate when the engine is Started. Also, steady the model with a foot on the landing gear skid.

8. Starting
   Connect the battery to the glowplug and start the engine by applying the starter. When started, switch off the starter and withdraw the starting shaft after making sure the rotation of the starter shaft stops.

9. Stopping the engine
   Fully pull down the throttle trim on the transmitter.

In case the engine does not stop.
Hold the rotor head, and pinch the fuel line to stop the fuel supply. If it still does not stop, pull off the fuel line from the carburetor. It is necessary to readjust the throttle linkage so that the carburetor rotor is fully closed when the throttle stick and throttle trim on the transmitter are fully pulled Down.

NOTE: If the throttle response is poor or the engine stops due to a temporarily over-rich mixture immediately after the engine is started, pinch the fuel line for one or two seconds until the engine r.p.m. increase and the engine runs steadily.

RUNNING-IN (“Breaking-in”)
All internal-combustion engines benefit, to some degree, from extra care when they are run for the first few times known as running-in or breaking-in. This allows the working parts to mate together under load at operating temperature. However, because O.S. engines are made with the aid of the finest modern precision machinely and from the best and most suitable materrials, only a very short and simple running-in procedure is required and can be carried out with the engine installed in the model.

• Main needle is set two and half turns open from fully closed position and the medium speed needle is set one turn open from fully closed position when the engine leaves the factory.
• It is expected with these needle settings the engine may run rich. During running-in, hover the model making sure the engine runs rich. Also, during running-in since the mixture is rich, you may feel uneven engine rpm and more fuel consumption.
• In the next section, needle adjustments to optimum position from running-in position are explained. Be sure to run the engine a little on the rich side so that if will have a long life expectancy.

ADJUSTMENT

Please observe the following before beginning to make any adjustment.

• High-Speed Needle Valve. Turn this approximately 30 degrees (3 to 4 clicks) at a time, when making initial adjustments; then in steps of approximately 15 degrees (1 to 2 clicks) when making final adjustments.
• Medium-Speed Needle Valve. Turn approximately 30 degrees (3 to 4 clicks) at a time. Idle Mixture Control Screw. Turn approximately 5 degrees at a time. It turns approximately 90 degrees both sides from the center. Turn left to enrich the idle mixture and turn right to lean the idle mixture.

The general course of adjustment procedure is shown in the ADJUSTING CHART and is correct for a fuel containing 20% lubricant and 15-30% nitromethane. Bear in mind that fuels containing relatively large percentages of power-boosting nitromethane operate at richer mixture settings than are needed for mild fuels and require the High-Speed Needle Valve to be readjusted accordingly. The type and percentage of lubricant used is also a factor here, as noted later in these instructions. This carburetor is not equipped with a throttle stop screw. Instead, idle speed is adjusted by means of the throttle trim lever on the transmitter.

ADJUSTMENT PROCEDURE

As a safety measure, first check the transmitter controls, including the throttle stick and trim lever positions, and hold the main rotor securely before starting the engine.

1. Warm the engine by allowing it to idle for about 30 seconds. If the engine stops, advance the throttle trim lever slightly to increase the idle rpm. Then open the throttle sufficiently to ‘float’ the model above the ground. lf, at this time, the engine is slow to pick up and produces an excess of exhaust smoke, the mixture is too rich. Correct this condition by turning the Mixture Control Screw clockwise 5 degrees. lf the mixture is extremely rich, engine rpm will become unstable: opening the throttle will produce a great deal of smoke and rpm may drop suddenly or the engine may stop.
2. Having provisionally set the idle mixture, the next step is to adjust the mixture for hovering flight. Hover the model and actuate the throttle to observe response over the medium speed range. lf the engine smokes excessiveIy and throttle response is poor, the mixture is too rich ; in which case, land the model and turn the High-Speed Needle Valve clockwise. Do not close the High-Speed NeedIe Valve more than the recommended initial adjustment (3 to 4 clicks) at a time, keeping it a little on the rich side at this stage. DO NOT touch the Medium Speed Needle Valve. If, on the other hand, hovering is not stable and response to the throttIe is over-sensitive, or if the engine tends to overheat, this indicates that the mixture is too lean and should be corrected by turning the High-Speed Needle Valve counter-clockwise. When satisfactory hovering flight has been achieved, land the modeI again and re-check the engine’s idle qualities. After about 10 seconds of idling, open the throttle to ‘float’ the model. lf the transition is smooth, the idle mixture is O.K. If the symptoms of either rich or Iean running are observed, readjust the Idle Mixture Control Screw accordingly. NOTE : With this carburetor, neither the Idle Mixture Control Screw adjustment, nor the Medium Speed Needle Valve adjustment will have any effect on mixture strength when the throttle is fully (or almost fully) open.
3. Now adjust the High-Speed Needle Valve to achieve the best performance when the model is flying at full throttle. lf, at full throttle, acceleration is poor, the exhaust unduly smoky and the model fails to reach expected straight line speed, the mixture is too rich and the High-Speed Needle Valve setting will need to be reduced. lf, however, after smoothly acceIerating to satisfactory high-speed straight and level flight, power is lost when the model is puIled up into a climb, the mixture is too lean. ln this case, land the model immediately and readjust thw High-Speed Needle Valve to a richer setting.
4. Having now found the optimum setting for the High-Speed Needle Valve, re-check the engine’s idle performance, fine tuning the Idle Mixture Control Screw, if necessary, to perfect the idle.
5. Now re-check hovering performance It may be found that (with the High-Speed Needle Valve now set for optimum full-throttle performance) hovering will reveal symptoms of slightly lean running at medium speeds. DO NOT touch the High-Speed Needle Valve.

It is at this point that the Medium Speed Needle Valve, previously set one turn open, may be brought into operation. Open the Medium Speed Needle Valve 30 degrees, or 3-4 clicks, then fine tune until the optimum hovering performance is obtained. If on the other hand, hovering reveals rich running, close the Medium Speed Needle Valve gradually until the optimum hovering performance is obtained.

• SUBSEQUENT READJUSTMENTS
  Once the engine has been run-in and the carburetor controls properly set up, it should be unnecessary to alter the mixture settings, except to make minor changes to the Main (High-Speed) Needle Valve occasionally, to take account of differences in climatic condisitions. However, as previously mentioned, the use of a different fuel, particularly one containing more, or less, nitromethane and / or a different type or proportion of lubricating oil, is likely to call for some modification to the High-Speed Needle-Valve adjustment. As a safety measure, it is advisable to increase the High-Speed Needle Valve setting by an extra half-turn counter-clockwise, prior to establishing the new setting. The same applies if the silencer type is changed. A different silencer may alter the exhaust pressure applied to the fuel feed and call for a revised Needle-Valve setting. The use of a different glowplug, or changes to the main rotor and its pitch angles may also require compensating carburetor readjustments.

• CARBURETOR CLEANLINESS
  Remove this with an 8mm wrench Dirt and foreign matter mostly accumulate here The correct functioning of the carburetor depends on its small fuel orifices remaining clear. The minute particles of foreign matter that are present in any fuel can easily partially obstruct these orifices and upset mixture strength so that engine performance becomes erratic and unreliable. It is recommended that fuel is passed through a filter when the tank is filled and that a good in-line filter is installed between the fuel tank and carburetor and, furthermore, that this filter is frequently cleaned to remove foreign matter that accumulates on the filter screen. Finally, occasionally remove the needle-valve holder from the carburetor as shown in Picture and extract any remaining foreign matter that may have lodged in the location shown in Picture below.

CARE AND MAINTENANCE

Please pay attention to the matters described below to ensure that your engine serves you well in regard to performance, reliability and long life.

• As previously mentioned, it is vitally important to avoid operating the engine in conditions where dust, disturbed 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 Filters (L) and (S) are available as optional extras. Install an in-line fuel filter between the tank and carburetor to prevent foreign matter in the tank from entering the carburetor.
• If these precautions are neglected, restriction of fuel flow may cause the engine to cut out, or the fuel/air mixture to become too lean causing the engine to overheat.
• Clean these filters periodically.
• The use of modern high-performance alcohol based model engine fuels, while promoting cooler running, improved anti-detonation combustion and increased power, have the disadvantage of causing corrosion due to the acid by-products of combustion.
• The use of nitromethane in the fuel can also contribute to the problem.
• Do not close the needle-valve and mixture control valve too far as this will cause a lean setting and over heating of the engine. This can, in turn, create nitromethane oxide leading to internal rusting of the engine. Always adjust the needlevalve slightly on the rich side of peak rpm.
• Do not leave unused fuel in the engine at the conclusion of a day’s flying. Accepted practice is to cut off the fuel supply while the engine is still running at full throttle, then expel as much fuel residue as possible by turning the engine over 5-10 seconds with the electric starter.
• Finally, inject some after-run oil through the glowplug hole and turn the engine over several times by hand.

O.S. GENUINE PARTS & ACCESSORIES

• GLOW PLUG
  • No.7 (71607100)
  • No.8 (71608001)
  • No.10 (Former A5) (71605100)
• CRANKSHAFT CLAMP 91/105/GT15 (71530530)
• NON-BUBBLE WEIGHT (71531000)
• NON-BUBBLE WEIGHT (S) (71531010)
• SUPER FILTER (L) (72403050)
• LONG SOCKET WRENCH WITH PLUG GRIP (71521000)
• O.S. SPEED PLUG WRENCH (71520100)
• SILICONE TUBE(2.5mm×1000MM) (72506100)
• NORD LOCK WASHER (10set) M4 (55500003)

The specifications are subject to alteration for improvement without notice.

ENGINE EXPLODED VIEW

ENGINEN PARTS LIST

The specifications are subject to alteration for improvement without notice.

CARBURETOR EXPLODED VIEW

THREE VIEW DRAWING

Dimensions (mm)

SPECIFICATIONS

• Displacement 14.95 cc / 0.912 cu.in.
• Bore 27.7 mm / 1.091 in.
• Stroke 24.8 mm / 0.976 in.
• Output 3.6 ps / 3.55 hp / 16,000 r.p.
• Practical R.P.M. 2,000-16,000 r.p.m.
• Weight 603 g / 21.27 oz. (Engine)

6-15 3-Chome Imagawa Higashisumiyoshi-ku
Osaka 546-0003, Japan
TEL . ( 0 6 ) 6702-0225
FAX. (06) 6704-2722
http://www.os-engines.co.jp

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