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.
SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINE Remember that your engine is not a "toy", but a highly efficient internalcombustion 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.
NOTES This engine was designed for model aircraft. Do not attempt to use it for any other purpose. If you remove the glowplug from the engine and check its condition by connecting the battery leads to it, do not hold the plug with bare fingers.Use an appropriate tool or a folded piece of cloth. Mount the engine in your model securely, following the manufacturers' recommendations, using appropriate screws and locknuts.
NOTES 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. For their safety, keep all onlookers (especially small children) well back (at least 20 feet or 6 meters) 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.
NOTES WHEN APPLYING AN ELECTRIC STARTER Do not over-prime. This could cause hydraulic lock and damage the engine on application of the electric starter. If over-primed, remove glowplug, close needle-valve and apply starter to pump out surplus fuel. Cover the head with a rag to prevent pumped out fuel coming into your eyes. 8 Please note that this engine is not supplied with any tools (e.g. Allen keys, wrenches, etc.
BEFORE STARTING FUEL The FL-70 should be operated on a methanol based fuel containing not less than 20% (volumetric) castor oil, or a top quality synthetic lubricant (or a mixture of both), plus a small percentage (5-15%) of nitromethane for improved flexibility and power. (The carburetor is adjusted at the factory for a fuel containing 20% lubricant and 15% nitromethane.) Some commercial fuels also contain coloring additives as an aid to fuel level visibility.
Spinner Since the FL-70 is intended to be started with an electric starter, the addition of a spinner assembly for centering the starter sleeve is desirable. Use a heavy-duty, well balanced spinner either of metal or plastic. props than those shown in the table may be used, but remember that the propeller noise will increase if blade tip is raised, due to higher rpm or if a larger-diameter/lower-pitched prop is used. Sport & Aerobatic Trainer & Scale SILICONE FUEL LINE Heatproof silicone tubing of approx.
Engine Parts Name F-4030 Silencer Assembly Exhaust Header Pipe Nipple No.1 (Larger hole) Rocker Cover Glow Plug Nipple No.5 (Smaller hole) Lock Nut Set Lock Nut Silencer Body Propeller Washer Drive Hub Rotor Guide Screw Crankcase Carburetor Type 60W Needle Beam Mount Throttle Lever Cover Plate Airbleed Screw 14 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.
How to fasten the mounting screws. ● Hardwood mounting beams 3mm steel nuts Tighten second nut firmlydown onto first nut. Spring washer or lock washer 15mm min. 15mm min. Radial motor mount (cast aluminum) Tighten this nut first. Hardwood such as cherry or maple. Steel washer Make sure that these mounting beams are accurately aligned and firmly integrated with the airframe, reinforcing the adjacent structure to absorb vibration.
FUEL TANK & LINES General Plumbing Make connections as shown in fig.1. With the airbleed type carburetor it is necessary to set the idle rpm a little higher to prevent engine cutting. Make sure that the tank is well rinsed out with methanol or glow fuel before installation and that the pickup weight is well clear of the bottom of the tank when held vertically.
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 (commercially available) Fuel Stopper (commercially available) Refueling tubing T Nipple (supplied) T Nipple (commercially available) Approx.
PROPELLER & SPINNER ATTACHMENT There is a risk, particularly with powerful fourstroke 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. 3. Add the specially tapered and slotted locknut and secure with a 10mm wrench while holding the prop nut with the 13mm wrench. Obviously, this can be very hazardous. To eliminate such dangers, the O.S.
GLOWPLUG The FL-70 is supplied with an O.S. Type F glowplug, specially designed for O.S. four-stroke engines. Install a plug suitable for the engine. Use fuel containing a moderate percentage of nitromethane unless more is essential for racing events. Do not run the engine too lean and do not leave the battery connected while adjusting the needle. The role of the glowplug With a glowplug engine, ignition is initiated by the application of a 1.5-volt power source.
3. Check that the current to the glowplug is switched off. Element glows when energized. Pliers 4. To close the needle-valve, turn it clockwise, while to open the needle-valve, turn it counterclockwise. Turn the needle-valve clockwise slowly until it stops. This is the fully closed position. Replace the plug when the element does not glow or is burnt out. 5. Open the needle-valve 2-2.5 turns from the fully closed position and set the throttle in the fully open position.
On the contrary, prolonged low speed running may cause the oil in the fuel to congeal, which may result in seizure of the piston and cylinder liner. The recommended procedure is as follows: 1. Use the same fuel and prop as you intend for flying your model. 5. Repeat this process, alternately running the engine fast and slow by means of the needle-valve, while keeping the throttle fully open, then begin to extend the short periods of high-speed operation until two tanks of fuel have been consumed.
Start the engine. CARBURETOR AIR-BLEED ADJUSTMENT Make sure that the throttle is fully open. Pre-Flight Check Start engine and adjust needlevalve as previously described. 20-30˚ open from maximum r.p.m. setting. Adjust the neede-valve. Close the throttle gradually. Close the throttle gradually. The position where the lowest possible r.p.m. ,with steady running, is obtained. Find the idling position. Find the idling position. Re-set the idling position at a little higher r.p.m.
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.
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 for repair, these clearances should be checked and reset as necessary. For checking and adjusting the valve clearances, a VALVE ADJUSTING TOOL KIT is available as an optional accessory. The kit comes in a plastic case and includes: (Code No.
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. Install an in-line fuel filter between the tank and carburetor to prevent dirt and dust in the tank from entering the carburetor. Clean these filters periodically.
ENGINE EXPLODED VIEW C.M2.6x8 1 C.M3.5x20 C.M3x12 2-2 2 3-1 3 3-2 2-1 4-4 4-3 4-2 5-4 5-3 5-2 M11 4 29-3 5 7 8 6 4-1 5-1 9 29-1 22 11 23-1 10 12 15 23 23-2 24 17 B.M3x6 29 23-2 16 25 14-1 27 28 26 13 14 F.+M2.6x6 19 18 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 20 21 39 38 29-2 C.M2.6x10 No.
CARBURETOR EXPLODED VIEW C.M2.6x10 N.+M3x6 4 C.M2.6x7 6 3 1-1 6-2 2 6-3 6-1 1 7 B.M2.6x5 S.M3X3 C.M2.6x15 5-2 5-1 5 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 40 CARBURETOR PARTS LIST No. Code No.
O.S. GENUINE PARTS & ACCESSORIES O.S.GLOW PLUG TYPE F RADIAL MOTOR MOUNT (71905010) (71615009) BOOSTER CABLE SET BOOSTER TERMINAL KIT (72200110) (72200130) Needle Valve Extension Cable Set (72200080) PROPELLER LOCKNUT SET PROPELLER LOCKNUT SET FOR TRUTURN SPINNER 1/4"-M5 (45810100) (45810200 For Spinner) FLEXIBLE EXHAUST PIPES (45810300) Code.No.
THREE VIEW DRAWING Dimension(mm) 59.5 Approx. 44 4- 3.7 49.5 Approx. 85 20 89.5 107.5 (Silencer including exhaust header pipe) 11.45 cc (0.698 cu.in.) 27.7mm (1.090 in.) 19.0mm (0.748 in.) 2,300-12,000 r.p.m. 1.1ps / 11,000 r.p.m. 467g (16.48 oz.) 51.5g (1.8 oz.) 45 Displacement Bore Stroke Practical R.P.M. Power output Weight 20 ■ ■ ■ ■ ■ ■ 25.8 Specification 18 28.5 58.9 UNF1/4-28 35.4 54 34.5 59.5 21.4 43.5 44 6-15 3-Chome Imagawa Higashisumiyoshi-ku Osaka 546-0003, Japan TEL.
