O.S. Engine FS-70 Ultimate Owner's Instruction Manual

Manual is about: Four Cycle Engine

Summary of FS-70 Ultimate

  • Page 1

    It is of vital importance, before attempting to operate your engine, to read the general 'safety instructions and warnings' section on pages 2-4 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...

  • Page 2: Warnings

    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 or abused. As owner, you, alone, are responsible for the safe operation of your engine, so act with discretion and care at all times. If...

  • Page 3: Notes

    4 take care that the glow plug clip or battery leads do not come into contact with the propeller. Also check the linkage to the throttle arm. A disconnected linkage could also foul the propeller. After starting the engine, carry out any needle-valve readjustments from a safe position behind the rota...

  • Page 4

    6 because the fs-70 ultimate 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. Installation make sure tha...

  • Page 5

    8 the function of the various tubing connected to the engine and tank (see sketch) are as follows: to draw fuel from tank to pump (in) to deliver fuel from pump to carburetor (out) to pressurize fuel tank. Air intake pipe to take air into the crankcase, not a breather. Be careful not to let the dirt...

  • Page 6

    10 never disassemble the fuel pump or pressure regulator. Their original performance may not be restored after reassembly. Do not allow foreign matter to enter the fuel system. Dirt inside the pump or regulator, no matter how small, may obstruct the flow of fuel and prevent these components from wor...

  • Page 7

    12 since the fs-70 ultimate is intended to be started with an electric starter, the addition of a spinner assembly for centering the starter sleeve is desirable. In this case, optional locknut sets are available from o.S. Propeller locknut set for spinner (code no. 45810200) propeller locknut set fo...

  • Page 8

    14 start and adjust the engine as detailed in the starting instructions. Now open the throttle fully and run the engine with the condition of emitting a good deal of white smoke. Open the needle-valve gradually to increase r.P.M., then close the needle-valve gradually to lower r.P.M. Repeat this pro...

  • Page 9

    16 note: valve clearances of all o.S. Four-stroke-cycle engines must be checked and reset only when the engine is cold. Procedure is as follows. Remove the cover from the rocker-box on top of the cylinder-head, using the correct size allen hex key. 1. (Ⅰ) turn the propeller counter-clockwise until c...

  • Page 10

    18 do not leave unused fuel in the engine at the conclusion of a day's flying. Accepted practice is to cut off the fuel supply while the engine is still running - at full throttle - then, expel as much fuel residue as possible by turning the engine over for 5-10 seconds with the electric starter. Fi...

  • Page 11

    20 exploded view type of screw c...Cap screw m...Oval fillister-head screw f...Flat head screw n...Round head screw s...Set screw c.M3x12 c.M3x16 c.M2.6x8 c.M2.6x8 f.+m2.6x6 2 30-2 3 3-1 3-2 4 4-1 4-2 5 5-4 5-3 5-2 5-1 6 7 8 9 1 10 11 12 13 14 15 17 18 19 20 21 22 30-1 30-2 23 24 25 26 6-1 6-2 6-3 6...

  • Page 12

    21 parts list rocker cover rocker cover gasket rocker support assembly rocker support rocker arm retainer (2pc. /1pair) rocker arm assembly (1pair) rocker arm (1pc.) tappet adjusting screw (w/nut) intake valve assembly (1pair) intake valve (1pc.) valve spring (1pc.) valve spring retainer (1pc.) spli...

  • Page 13

    23 dimensions(mm) specifications three view drawing displacement bore stroke practicalr.P.M. Output weight 11.45cc / 0.698cu.In. 27.7mm / 1.091in. 19.0mm / 0.748in. 2.000-15.000r.P.M. 1.2ps / 11.000r.P.M. 455g / 16.0oz. Japan japan 54 35.4 59.5 34.5 24.1 50.2 29.6 35.1 87.4 18 105.4 20 49.5 45 58.9 ...

  • Page 14

    C copyright 2003 by o.S.Engines mfg. Co., ltd. All rights reserved. Printed in japan. Tel. (06) 6702-0225 fax. (06) 6704-2722 6-15 3-chome imagawa higashisumiyoshi-ku osaka 546-0003, japan 60091400 090304 url : http://www.Os-engines.Co.Jp u n eq ua ll ed qua lity precision & per for m an ce es ta bl...