Table of Contents
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It is of vital importance, before attempting to
operate your engine, to read the general
'SAFETY INSTRUCTIONS AND WARNINGS'
section on pages 2-6 of this booklet 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.
Keep these instructions in a safe place so that
you may readily refer to them whenever
necessary.
It is suggested that any instructions supplied
with the aircraft, radio control equipment, etc.,
are accessible for checking at the same time.
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Table of Contents
Related Manuals for O.S. engine MAX-91FX
Summary of Contents for O.S. engine MAX-91FX
- Page 1 It is of vital importance, before attempting to operate your engine, to read the general 'SAFETY INSTRUCTIONS AND WARNINGS' section on pages 2-6 of this booklet 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.
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Page 2: Table Of Contents
CONTENTS STARTING SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINE RUNNING-IN (Breaking-in) FEATURES OF FX SERIES ENGINES, BEFORE IDLING ADJUSTMENT CHART INSTALLING THE ENGINE MIXTURE CONTROL VALVE ADJUSTMENT, BASIC ENGINE PARTS REALIGNMENT OF MIXTURE CONTROL VALVE NEEDLE-VALVE LOCATION SUBSEQUENT STARTING PROCEDURE SUBSEQUENT READJUSTMENT INSTALLATION OF THE ENGINE CARBURETOR CLEANLINESS,... -
Page 3: Safety Instructions And Warnings About Your O.s. 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. - Page 4 WARNINGS • Never touch, or allow any object to come • Model engine fuel is also highly flammable. Keep it away from open flame, into contact with, the rotating excessive heat, sources of sparks, or propeller and do not crouch anything else which might ignite over the engine when it is it.
- Page 5 NOTES • • This engine was designed for model If you remove the glowplug from the engine aircraft. Do not attempt to use it for any and check its condition by connecting the other purpose. battery leads to it, do not hold the plug with bare fingers.Use an appropriate tool or a •...
- Page 6 NOTES • Always check the tightness of the propeller • Discard any propeller which has become nut and retighten it, if necessary, before split, cracked, nicked or otherwise rendered restarting the engine, particularly in the unsafe. Never attempt to repair such a case of four-stroke-cycle engines.
- Page 7 NOTES • • Adjust the throttle linkage so that the engine For their safety, keep all onlookers stops when the throttle stick and trim lever (especially small children) well back (at on the transmitter are fully retarded. least 20 feet or 6 meters) when preparing Alternatively, the engine may be stopped by your model for flight.
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Page 8: Features Of Fx Series Engines, Before
BEFORE INSTALLING THE ENGINE FEATURES OF FX SERIES ENGINES This range of engines is ideally suited to a variety Installing the glowplug • of R/C aircraft, including trainer, sports, aerobatic Carefully insert plug, with and scale types. washer, fingertight only, before final tightening with the correct A separate precision-made needle-valve unit is •... -
Page 9: Basic Engine Parts
NEEDLE-VALVE LOCATION BASIC ENGINE PARTS As delivered from the factory, the MAX-61FX and Glowplug Cylinder head MAX-91FX have their needle-valve assembly RING installed horizontally. However, if more convenient for a particular installation, the needle-valve may be reinstated vertically behind the cylinder. (See sketch... - Page 10 Use hexagon-head brass inlet holder (61FX) or 50SX/91FX plug screw (50SX/91FX) to blank off side boss Needle Extension vacated by needle- valve assembly. Plug Screw (50SX/91FX) Needle-Valve 61FX Assembly Needle Extension Fuel Inlet Fuel Inlet Inlet Holder Needle-Valve Assembly Needle-Valve Fuel Inlet Fuel Inlet Assembly...
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Page 11: Installation Of The Engine
Make sure that the mounting beams are parallel and INSTALLATION OF THE ENGINE that their top surfaces are in the same plane. Installation in the model CORRECT INCORRECT O.S. radial motor mount A typical method of beam (Available as an optional extra mounting is shown below, left. -
Page 12: Throttle Linkage, Silencer 11
THROTTLE LINKAGE SILENCER The exhaust outlet of the silencer can be rotated to Before connecting the throttle-lever / servo linkage, • any desired position in the following manner: make sure that no part of the linkage interferes with the internal structure of the aircraft or wiring, etc., E-4010 Silencer when the throttle is fully open or fully closed. -
Page 13: Fuel Tank Location
Reminder! Suggested Fuel Tank Capacities Model engines generate considerable heat. approx 350cc 50SX 61FX approx 300cc Do not touch any part of your engine until 46FX ¡ approx 450cc 91FX it has cooled. Contact with the muffler (silencer), cylinder head or exhaust header pipe, in particular, Attention to tank height may result in a serious burn. -
Page 14: Glowplug
GLOWPLUG Glowplug life Since the glowplug and fuel combination used may Particularly in the case of very high performance have a marked effect on performance and reliability, it engines, glowplugs must be regarded as expendable would be worthwhile to experiment with different plug types. -
Page 15: Fuel, Propellers 14
Reminder! FUEL Model engine fuel is poisonous. Do not allow it to come into contact with Select, by practical tests, the most suitable fuel from the eyes or mouth. Always store it in a among the best quality fuels available in your country clearly marked container and out of for model use. -
Page 16: Mixture Controls
Sport Aerobatic MIXTURE CONTROLS 12 7 11 6 10,12 6 50SX Two mixture controls are provided on these 40FX 10 6,10.5 6,11 6 engines. 11 8 10,12 7 46FX 10.5 6,11 6 8,12 6 The Needle Valve (at rear of engine) •... -
Page 17: Before Starting 16
BEFORE STARTING Warning (Very hot) Never touch the nichrome wire while the battery is Tools, accessories, etc. connected. The following items are necessary for operating the engine. Resistance coil (nichrome wire) 1 Fuel Model glowplug engine fuel of good quality, preferably containing a small percentage of nitromethane. -
Page 18: Starting 17
10 Silicone tubing 6 Fuel tank This is required for the For installation in the model, a 300cc (10.6oz.) for 50SX connection between the fuel and 40,46FX, a 350cc (12oz.) for 61FX, a 450cc tank and engine. (15.8oz.) for 91FX tank, is suggested. 7 Fuel bottle or pump 11 Plug wrench For filling the fuel tank, a simple,... - Page 19 Fill the fuel tank. Do not allow fuel to overflow into 6. Connect battery leads to glowplug. the silencer, otherwise the engine may become Bring electric starter into contact with spinner-nut flooded and difficult to start. or spinner and depress starter switch for one or Check that the needle-valve is closed.
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Page 20: Running-In (Breaking-In) 19
RUNNING-IN ("Breaking-in") Now close the needle-valve until the engine All internal-combustion engines benefit from extra speeds up to "two-cycle"operation and allow it to care when they are run for the first few timesknown run for about 10 seconds, then reopen the needle- as running-in or breaking-in. - Page 21 Optimum needle setting(1) Slowly advance the throttle to its fully open position, then gradually close the needle-valve until the exhaust note begins to change. (4-cycle to 2-cycle) At this point, disconnect the battery from the glowplug, taking care that the battery leads or glowplug clip do not come into contact with the rotating propeller.
- Page 22 Needle-valve adjustment diagram Note : Practical best(optimum) needle-valve setting This diagram is for reference Clear, high-pitched two-stroke purposes only. exhaust note Maximum rpm Actual needle positions may setting("Lean"). Intermittent, high-pitched differ from those shown. two-stroke note superimposed To stop the engine, close the STARTING •...
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Page 23: Idling Adjustment Chart
IDLING ADJUSTMENT CHART Start the engine. Disconnect the battery leads at mid speed. Make sure that the throttle is fully open. 20-30˚ open from maximum Adjust the neede-valve. r.p.m. setting. Close the throttle gradually. The position where the lowest Find the idling position. possible r.p.m. -
Page 24: Mixture Control Valve Adjustment
Note: Mixture Control Valve adjustments should MIXTURE CONTROL VALVE ADJUSTMENT be made in steps of 15-30˚ initially, carefully checking the effect, on throttle With the engine running, close the throttle and allow it response, of each small adjustment. to idle for about five seconds, then open the throttle fully. -
Page 25: Subsequent Starting Procedure
SUBSEQUENT STARTING PROCEDURE SUBSEQUENT READJUSTMENT Once the optimum needle-valve setting has been es- Once the engine has been run-in and the controls tablished (see page 19, Needle-valve adjustment dia- properly set up, it should be unnecessary to alter the gram) the procedure for starting may be simplified as mixture settings;... -
Page 26: Carburetor Cleanliness
CARBURETOR CLEANLINESS ENGINE CARE AND MAINTENANCE The correct functioning of the carburetor depends on At the end of each operating session, drain out any its small fuel orifices remaining clear. The minute fuel that may remain in the fuel tank. particles of foreign matter that are present in any fuel, Next, energize the glowplug and try to restart the can easily partially obstruct these orifices and upset... - Page 27 EXPLODED VIEW (50SX) C.M3 15 C.M3 8 S.M3 3 C.M2.6 18 Type of screw C Cap Screw F Flat Head Screw N Round Head Screw S Set Screw...
- Page 28 ENGINEN PARTS LIST (50SX) Description Code No. Cylinder Head 25204010 Cylinder Liner 25203100 Piston Ring 25303400 Piston 25203200 Piston Pin 25206000 Piston Pin Retainers 25217000 Connecting Rod 25205000 Carburetor (Type 40B) 25681010 25281140 Carburetor Spacer Carburetor Retainer 23981700 23210007 Propeller Nut Propeller Washer 23209003 Drive Hub...
- Page 29 EXPLODED VIEW (40,46FX) C.M3X15 C.M3X8 6 -1 S.M3X3 6 -2 r -2 r -7 r -1 r -4 r -5 r -6 N.+M3.5X6 r -3 Type of screw C Cap Screw F Flat Head Screw N Round Head Screw S Set Screw...
- Page 30 ENGINEN PARTS LIST (40,46FX) Code No. Description 40FX 46FX 25604000 25604010 Cylinder Head 25603000 25603010 Cylinder & Piston Assembly 25406000 24806301 Piston Pin 24817100 24817100 Piston Pin Retainer Connecting Rod 25305002 25305002 Carburetor ( Type 40B) 25681010 25681010 46215000 46215000 Carburetor Rubber Gasket Carburetor Retaining Screw ( 2pcs.) 25081700...
- Page 31 EXPLODED VIEW (61FX) C.M3 15 C.M3.5 8 C.M3 8 N.M3.5 6 r--10 r-11 Type of screw C Cap Screw F Flat Head Screw N Round Head Screw S Set Screw...
- Page 32 ENGINEN PARTS LIST (61FX) Description Code No. 27754000 Cylinder Head 27753000 Cylinder & Piston Assembly 26606008 Piston Pin 27917000 Piston Pin Retainer 26025000 Connecting Rod 27783000 Carburetor (Type 60C) 6 -1 46215000 Carburetor Rubber Gasket 6 -2 25081700 Carburetor Retaining Screw 45010002 Propeller Nut 28009002...
- Page 33 EXPLODED VIEW (91FX RING C.M3 15 8 -1 8 -2 t -9 C.M3.5 10 N.M3.5 6 S.M3 3 t -6 t -7 t -8 t -3 t -4 t -1 t -10 t -2 t -5 0 -1 e Type of screw C Cap Screw F Flat Head Screw N Round Head Screw S Set Screw...
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Page 34: Engine Parts Lists 26
ENGINE PARTS LIST (91FX RING Code No. Description Cylinder Head 29504000 Cylinder Liner 29503100 Piston Ring 29503400 Piston 29053200 Piston Pin 45406000 Piston Pin Retainers (2) 27917000 Connecting Rod 29505000 Carburetor (Type 60F) 29581000 8 -1 Carburetor Gasket 29015019 8 -2 Carburetor Retaining Screw (2pcs.) 25081700 Propeller Lock Nut Set... - Page 35 CARBURETOR 40B CARBURETOR 60C (61FX) (50SX,40,46FX) 1-11-2 N.+M3.5X6 N.+M3.5X6 Type of screw C Cap Screw F Flat Head Screw N Round Head Screw S Set Screw Description Code No. Description Code No. 22781401 Throttle Lever Assembly 22781401 Throttle Lever Assembly 22781420 Throttle Lever Fixing Screw 22781411...
- Page 36 CARBURETOR 60F (91FX RING N.+M3 6 N.M3.5 6 Type of screw C Cap Screw F Flat Head Screw N Round Head Screw S Set Screw Code No. Description 27881400 Throttle Lever Assembly 29581200 Carburettor Rotor 45582300 Mixture Control Valve Assembly 46066319 "O"...
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Page 37: Genuine O.s. Parts & Accessories 36
O.S. GENUINE PARTS & ACCESSORIES O.S. GLOW PLUGS SPINNER NUT LONG PROPELLER NUT SETS No.8 (71605100) (71608001) Type of Engine Code No. Size Code No. Size Type of Engine 1/4"-28 ( L ) 23024009 50SX. 40. 46FX 73101000 1/4"-28 50SX. 40. 46FX 45024000 5/16"-24 61FX. - Page 38 EXHAUST SUPER SILENCERS O.S. SILICONE SUPER FI LTER HEADER PIPE TUBE ASSEMBLY (72403050) (72101230) LOCK WASHER (10Sets) Type of Engine Code No. Type of Engine Type of Engine Code No. Size Code No. Size 40.46FX 72105337 55500002 50SX. 40.46FX 25425020 873S 50SX.
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Page 39: Engine Three View Drawings 38
17.5 50SX MAX- RING Dimensions(mm) SPECIFICATIONS 8.17 cc ( 0.499 cu.in. ) Displacement 22.0mm ( 0.866 in. ) Bore 21.5mm ( 0.847 in. ) Stroke Practical R.P.M. 2,000 20,000 r.p.m. Power output 1.8 bhp / 17,000 r.p.m. 390g ( 13.76 oz. ) Weight UNF1/4-28 60.7... -
Page 40: Three View Drawing
THREE VIEW DRAWING 17.5 40FX MAX - SPECIFICATIONS 6.47 cc ( 0.395 cu.in. ) Displacement 20.5mm ( 0.807 in. ) Bore 19.6mm ( 0.772 in. ) Stroke Practical R.P.M. 2,000 17,000 r.p.m. Power output 1.36 bhp / 16,000 r.p.m. 386g ( 13.6 oz. ) Weight 46FX MAX -... - Page 41 61FX MAX - ø4.2 SPECIFICATIONS 9.95 cc ( 0.607 cu.in. ) Displacement 24.0mm ( 0.945 in. ) Bore 22.0mm ( 0.866 in. ) Stroke Practical R.P.M. 2,000 17,000 r.p.m. Power output 1.9 bhp / 16,000 r.p.m. 550g ( 19.42 oz. ) Weight ø4.2 UNF5/16-24...
- Page 42 91FX MAX - RING SPECIFICATIONS 14.95 cc ( 0.912 cu.in. ) Displacement 27.7mm ( 1.091 in. ) Bore 24.8mm ( 0.976 in. ) Stroke Practical R.P.M. 2,000 16,000 r.p.m. Power output 2.8 bhp / 15,000 r.p.m. 550g ( 19.42 oz. ) Weight 24.7 4- 4.2...
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Page 43: Memo
6-15 3-Chome Imagawa Higashisumiyoshi-ku Osaka 546-0003, Japan TEL. (06) 6702-0225 FAX. (06) 6704-2722 URL : http://www.os-engines.co.jp Copyright 2001 by O.S.Engines Mfg. Co., Ltd. All rights reserved. Printed in Japan. 110101...
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