It is of vital importance, before attempting to operate your engine, to read the general 'SAFETY INSTRUCTIONS AND WARNINGS' section on pages 2-5 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 These engine were designed for model helicopters. Do not attempt to use it for any other purpose. After starting the engine, carry out any needlevalve 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. Mount the engine in your model securely, following the manufacturers' recommendations, using appropriate screws and locknuts. Use an electric starter.
Notes on installing cooling fan and clutch Application is as follows: Remove the crankcase rear cover plate from the engine and rotate the crankshaft to the bottom dead center (BDC) position. Do not use a tool which locks piston when installing a cooling-fan and clutch, or top of the piston may be damaged. Also, do not insert a screw driver or the similar into the exhaust port.
BASIC ENGINE PARTS INSTALLATION OF THE CARBURETOR Carburetor Typr 60K Fit the carburetor rubber gasket to the carburetor body. Heatsink Head Insert the carburetor seal washer into the carburetor fitting hole to the bottom. Glowplug Insert the carburetor retainer into the holes shown left and fit the carburetor to the engine.
BEFORE STARTING 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. Tools, accessories, etc. The following items are necessary for operating the engine. 1 Fuel Select, by practical tests, the most suitable fuel from among the best quality fuels available in your country for helicopter use.
FACTS ABOUT GLOWPLUGS Since the compatibility of glowplug and fuel may have a marked effect on performance and reliability, it may be worthwhile to choose the R/C type plug found most suitable after tests. Recommended O.S. plugs are No.8 and A5. Carefully install plug finger-tight, before final tightening with the correct size plug wrench. However, plug life can be extended and engine performance maintained by careful use, i.e.: Install a plug suitable for the engine.
Graduations on the carburetor body BASIC POSITION OF MIXTURE CONTROL VALVE (Mixture Control Screw) Fully opened position As delivered, the Mixture Control Screw is positioned at 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.
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. 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.
ADJUSTMENT PROCEDURE 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. 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.
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.
ADJUSTING CHART High Speed Needle Valve - 2 turns opened from fully closed position. Medium Speed Needle Valve - 1 turns opened from fully closed position. Idle Mixture Control Screw - 2 turns opened from fully closed position.
INSTALLATION OF THROTTLE SERVO After the engine is installed in the helicopter, please observe the following recommendations when linking the throttle servo to the carburetor. Locate the servo so that its output arm and the throttle pushrod are, as close as possible, directry in line with carburetor's throttle arm, as shown. Servo output arm Throttle control rod A and B should be equal length.
O.S. GENUINE PARTS & ACCESSORIES O.S. GLOW PLUGS DRIVE HUB (27708010) MIXTURE CONTROL CARBURETOR 60D No.8 (27983000) IN-FLIGHT CONTROL NEEDLE VALVE (71705000) (71608001) A5 (71605100) SUPER FILTER (L) (72403050) CRANKSHAFT CLAMP 7091 Cap Screw Set (10pcs. set) M2.
ENGINE EXPLODED VIEW ENGINE PARTS LIST C.M3x15 1 18 2 3 5 27 26 4 6 16 7 C.M3x8 17 8 15 C.M2.6x20 No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Code No. 27004300 27003100 27003400 27003200 27006000 27917000 27005000 27081000 45010002 46120000 26731002 27981710 27001000 27930000 27002000 27014000 27007000 25613000 71608001 27708200 14 41621100 Description Heatsink Head Cylinder Liner Piston Ring Piston Piston Pin Piston Pin Retainer (2pcs.
CARBURETOR EXPLODED VIEW C.M3x8 1-1 8 1 4 2 8-3 8-1 8-6 5 8-4 3-3 6 8-5 8-2 7 10 9-4 11 9-2 9-3 3-2 3-1 9-1 9 Type of screw C...Cap Screw M...Oval Fillister-Head Screw F...Flat Head Screw N...Round Head Screw S...Set Screw 3 28 CARBURETOR PARTS LIST No. 1 Description Code No. No. 27381410 Throttle Lever Assembly 1-1 22826131 Throttle Lever Retaining Screw (2pcs.) Description Code No. 8-2 24981837 8-3 46181940 "O"Ring (2pcs.
48 THREE VIEW DRAWING 12.5 12.5 11.50 cc (0.702 cu.in.) 25.8 mm (1.016 in.) 22.0 mm (0.866 in.) 2,000-18,000 r.p.m. 2.5 ps / 16,000 r.p.m. 553.5 g(19.5oz.) 42 Displacement Bore Stroke Practical R.P.M. Power output Weight 52 SPECIFICATIONS 42 24 77.5 JAPAN 40.5 JAPAN 21.5 UNF5/16-24 42.6 52 55.
