Page 1: Table Of Contents
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.
Page 2: 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 3 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 Mount the engine in your model securely, folded piece of cloth.
Page 4: Engine Construction
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.
Page 5: Notes When Applying An Electtric Starter
Please note that this engine is not supplied INTRODUCTION with any tools (e.g. Allen keys, wrenches, etc.) The FL-70 is an air-cooled, overhead- valve four stroke engine for model aircraft use. This engine is suitable for trainer, STANDARD ACCESSOIES sport and scale models.
Page 6: Before Starting
BEFORE STARTING FUEL The FL-70 should be operated on a methanol based Tools, accessories, etc.The following items are fuel containing not less than 20% (volumetric) castor necessary for operating the engine. oil, or a top quality synthetic lubricant (or a mixture of...
Page 7 Spinner props than those shown in the table may be Since the FL-70 is intended to be used, but remember that the propeller noise started with an electric starter, the will increase if blade tip is raised, due to higher...
Page 8: Engine Parts Name
Airbleed Screw INSTALLATION Because the FL-70 is a powerful, large-displacement, single-cylinder four-stroke-cycle engine, it is essential to use very substantial engine mounting. Conventional wooden mounting beams should be of rigid hardwood and of at least 15mm or 5/8-in square section.
Page 9: Silencer & Exhaust Header Pipe Installation
How to fasten the mounting screws. Make sure that these mounting beams are ● accurately aligned and firmly integrated with Hardwood mounting beams the airframe, reinforcing the adjacent Tighten second nut structure to absorb vibration. Use 3mm or firmlydown onto first nut. 3mm steel nuts larger steel screws, preferably Allen type Tighten this nut first.
Page 10: Fuel Tank & Lines
FUEL TANK & LINES General Plumbing Make connections as shown in fig.1. With the Make sure that the tank is well rinsed out airbleed type carburetor it is necessary to set with methanol or glow fuel before installation the idle rpm a little higher to prevent engine and that the pickup weight is well clear of the cutting.
Page 11: Throttle Linkage
Fig. 2 Plumbing suitable for aerobatic flights No.5 Nipple (smaller hole) No.1 Nipple (larger hole) Install a fuel tank so that carburetor center line and fuel tank center line may come to as much close as possible (within 10mm lower or higher). Fuel Filter T Nipple (supplied) (commercially available)
Page 12: Propeller & Spinner Attachment
PROPELLER & SPINNER ATTACHMENT There is a risk, particularly with powerful four- Add the specially tapered and slotted stroke engines, of the propeller flying off if the locknut and secure with a 10mm wrench prop loosens detonation while holding the prop nut with the 13mm ("knocking") in the combustion chamber when wrench.
Page 13: Glowplug
GLOWPLUG The FL-70 is supplied with an O.S. Type F glowplug, Install a plug suitable for the engine. specially designed for O.S. four-stroke engines. Use fuel containing a moderate percentage of nitromethane unless more is essential for racing The role of the glowplug events.
Page 14 Check that the current to the glowplug is Element glows when energized. switched off. Pliers Close To close the needle-valve, turn it clockwise, while to open the Open needle-valve, turn it counter- clockwise. Turn the needle-valve Replace the plug when the Close clockwise slowly until it stops.
Page 15 On the contrary, prolonged low speed running Repeat this process, alternately running the may cause the oil in the fuel to congeal, which engine fast and slow by means of the may result in seizure of the piston and cylinder needle-valve, while keeping the throttle fully liner.
Page 16: Carburetor Air-Bleed Adjustment
Start the engine. CARBURETOR AIR-BLEED ADJUSTMENT Make sure that the throttle is fully open. Pre-Flight Check Start engine and adjust needle- ˚ 20-30 open from maximum Adjust the neede-valve. valve as previously described. r.p.m. setting. Close the throttle gradually. Close the throttle gradually. The position where the lowest Find the idling position.
Page 17: Trouble Shooting When The Engine Fails To Start
TROUBLE SHOOTING WHEN THE ENGINE FAILS TO START Four key points For quick, reliable starting, the following four conditions are required. 1 Good compression. 2 Adequate "glow" at glowplug. 3 Correct mixture. 4 Sufficient electric starter rotating speed. If the engine fails to start, or does not keep running after being started, check symptoms against the following chart and take necessary corrective action.
Page 18: Valve Adjusting
VALVE ADJUSTING Valve clearances are correctly set before any O.S. engine leaves the factory and, in normal use, will seldom require adjustment. However, if, after a considerable amount of running time, a loss of power is detected, or if he engine has been disassembled repair,...
Page 19: Care And Maintenance
CARE AND MAINTENANCE Please pay attention to the matters Install an in-line fuel filter between the tank described below to ensure that your engine and carburetor to prevent dirt and dust in the serves you well in regard to performance, tank from entering the carburetor.
Page 20 Code No. Description ENGINE EXPLODED VIEW 44404200 Rocker Cover 45961400 Rocker Support Assembly C.M2.6x8 45961410 Rocker Support 45761600 Rocker Arm Retainer (2pcs.) 44753000 Rocker Arm Assembly (1pair) 44753100 Rocker Arm (1pc.) 45761200 Tappet Adjusting Screw C.M3.5x20 44460000 Intake Valve Assembly (1pair) 44460100 Intake Valve (1pc.) 45960210...
Page 21: Carburetor Exploded Views
CARBURETOR EXPLODED VIEW C.M2.6x10 N.+M3x6 C.M2.6x7 S.M3X3 C.M2.6x15 B.M2.6x5 Type of screw C...Cap Screw B...Binding Head Screw M...Oval Fillister-Head Screw F...Flat Head Screw N...Round Head Screw S...Set Screw CARBURETOR PARTS LIST Description Code No. 22081408 Throttle Lever Assembly 22081313 Throttle Lever Retaining Screw 44481200 Carburetor Rotor 44481100...
Page 22: O.s. Genuine Parts & Accessories
O.S. GENUINE PARTS & ACCESSORIES BOOSTER O.S.GLOW PLUG BOOSTER RADIAL MOTOR MOUNT TYPE F TERMINAL KIT CABLE SET (71905010) (72200130) (71615009) (72200110) Needle Valve Extension Cable Set (72200080) PROPELLER PROPELLER LOCKNUT SET FLEXIBLE EXHAUST PIPES FOR TRUTURN SPINNER LOCKNUT SET (45810100) 1/4"-M5 (45810300)
Page 23: Three View Drawing
THREE VIEW DRAWING Dimension(mm) Specification 59.5 11.45 cc ( 0.698 cu.in. ) ■ Displacement 4- 3.7 27.7mm (1 .090 in. ) ■ Bore 19.0mm ( 0.748 in. ) ■ Stroke ■ Practical R.P.M. 2,300-12,000 r.p.m. ■ Power output 1.1ps / 11,000 r.p.m. 467g (16 .48 oz.

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