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 familia...
2 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 fu...
4 notes this engine was designed for model aircraft. Do not attempt to use it for any other purpose. Mount the engine in your model securely, following the manufacturers' recommenda- tions, using appropriate screws and lock- nuts. Be sure to use the silencer (muffler) supplied with the engine. Frequ...
6 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. Take care that loose clothing (ties, shirt slee...
8 notes when applying an electric 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 glowplug, close needle-valve and apply starter to pump out surplus fuel. Cover the head with a rag to prevent pumped out...
10 basic engine parts cylinder head carburetor type 61a crankshaft propeller nut propeller washer drive hub crankcase cover plate glowplug beam mount lock nut max -75ax is shown. (type 61c for 95ax) 11 tools, accessories, etc. The following items are necessary for operating the engine. Before starti...
12 fuel the 75ax and 95ax should be operated on a methanol based fuel containing not less than 18% (volumetric) castor oil, or a top quality synthetic lubricant (or a mixture of both), plus a small percentage (5-20%) of nitromethane for improved flexibility and power. (the carburetor is adjusted a l...
14 8mm tools hex screwdriver screwdriver necessary for engine installation. 1.5mm, 2.5mm, 3.0mm necessary for carburetor adjustments. Phillips screwdriver no.2, etc. Long socket wrench with plug grip recommended for easy removal and replacement of the angled and recessed glowplug, the o.S.Long socke...
16 how to fasten the mounting screws. Hardwood mounting beams radial motor mount (cast aluminum) tighten second nut firmlydown onto first nut. Tighten this nut first. Steel washer 3mm steel nuts 3mm steel screw spring washer or lock washer 15mm min. 15mm min. Hardwood such as cherry or maple. Spring...
18 installing the glowplug install washer on glowplug and insert carefully into cylinder-head, making sure that it is not cross-threaded before tightening firmly. Glow plug washer needle-valve extension the needle-valve supplied with this engine is designed to incorporate an extension so that, when ...
20 suggested fuel tank capacity is approx 350cc. This will allow 10minute flights. Fuel tank location be sure to use a pressurized fuel system by connecting the muffler pressure nipple to the vent-pipe of the fuel tank. Make sure that the tank is well rinsed out with methanol or glow fuel before ins...
22 mixture controls the needle valve when set to produce maximum power at full throttle, this establishes the basic fuel/air mixture strength. The correct mixture is then maintained by the carburetor's built-in automatic mixture control system to cover the engine's requirements at reduced throttle s...
24 ! Starting be sure to use an electric starter to start the engine. Fill the fuel tank with fuel. When filled, prevent the fuel from flowing into the carburetor with a commercially available fuel stopper, etc. Release the stopper before starting the engine. 1. 2. Starting procedure is as follows: ...
26 attention : do not choke the carburetor air intake when applying the starter. This could cause an excessive amount of fuel to be drawn into the cylinder which may initiate a hydraulic lock and damage the engine. If the engine does not start within 10 repeat applications of the starter, remove the...
28 during subsequent flights, the needle-valve can be gradually closed to give more power. However, if the engine shows signs of running too lean, the next flight should be set richer. After a total of ten flights, the engine should run continuously, on its optimum needle-valve setting, without loss...
30 idling adjustment char t start the engine. Make sure that the throttle is fully open. Adjust the needle-valve. Close the throttle gradually. Set the idle speed open the throttle fully. Does the engine regain full power? Continue running at high spee d for 10 seconds. Close the throttle . Run at i...
32 realignment of mixture control valve subsequent starting procedure once the optimum needle-valve setting has been established (see page 29, needle-valve adjustment diagram) the procedure for starting may be simplified as follows. Open the needle-valve one half-turn (180 degrees) from the optimum ...
34 1 2 3 symptom factor cause corrective action recharge the electric starter battery. Recharge lead-acid or ni-cad type cell or replace dry battery. (note: an unused, or almost unused, dry battery may sometimes be of insufficient capacity if it is "old stock".) replace glowplug. Check that applied ...
36 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 propel...
38 75ax engine exploded view type of screw c...Cap screw 79871110 79871160 m3x8 m3x16 cap screw sets (10pcs ./sets ) code no . Si ze pcs . Used in an engine cylinder head retaining screw (5pcs.) cover plate retaining screw (4pcs.) c.M3x16 c.M3x8 2 1 3 4 5 6 7 8 9 10 12 11 13 14 15 16 39 75ax engine ...
40 61a carburetor exploded view type of screw n...Round head screw s...Set screw 1 2 4 5 7 s.M3x3 3 6 3-1 3-2 7-1 7-2 8 8-1 n.+m3x6 9 n.+m3.5x6 10 41 61a carburetor parts list description code no. No. Specifications are subject to alteration for improvement without notice. Throttle lever assembly ca...
42 c.M3x16 c.M3x8 1 4 5 6 7 8 9 10 12 11 13 14 15 16 3 17 2 18 95ax engine exploded view type of screw c...Cap screw 79871110 79871160 m3x8 m3x16 cap screw sets (10pcs ./sets ) code no . Si ze pcs . Used in an engine cylinder head retaining screw (5pcs.) cover plate retaining screw (4pcs.) 43 95ax e...
44 1 2 4 5 7 s.M3x3 3 6 3-1 3-2 7-1 7-2 8 8-1 n.+m3x6 9 n.+m3.5x6 10 61c carburetor exploded view type of screw n...Round head screw s...Set screw 45 61c carburetor parts list description code no. No. Specifications are subject to alteration for improvement without notice. Throttle lever assembly ca...
46 (71905200) (71531000) (26625340) (71531010) o.S.Glow plug o.S. Genuine parts & accessories radial motor mount non-bubble weight silencer extension adaptors non-bubble weight s (26625500) 14.5mm 42.0mm 35.0mm 42.0mm width screw hole pitch (72403050) (79870050) m5 super filter blind nut (l) (798700...
48 displacement bore stroke power output at recommended r.P.M. Range recommended r.P.M. Range power output practical r.P.M. Weight specifications dimensions(mm) 75ax three view drawing (e-4040 silencer) 12.29 cc / 0.75 cu.In. 25.8 mm / 1.016 in. 23.5 mm / 0.925 in. 1.5 ps / 1.52 hp / 10,000 r.P.M. 2...
50 memo c copyright 2009 by o.S.Engines mfg. Co., ltd. All rights reserved. Printed in japan. 60092190 061102 tel. (06) 6702-0225 fax. (06) 6704-2722 6-15 3-chome imagawa higashisumiyoshi-ku osaka 546-0003, japan url : http://www.Os-engines.Co.Jp.
