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16

THROTTLE LINKAGE

Before  connecting  the  throttle  to  its  servo, 
make  sure  that  the  throttle  arm  and  linkage 
safely  clear  any  adjacent  part  of  the  airframe 
structure,  etc.,  as  the  throttle  is  opened  and 
closed. Connect the linkage so that the throttle 
is  fully  closed  when  the  transmitter  throttle 
stick  and  its  trim  lever  are  at  their  lowest 
settings  and  fully  open  when  the  throttle  stick 
is  in  its  fully-open  position.  Carefully  align  the 
appropriate holes in the throttle arm and servo 
horn  so  that  they  move  symmetrically  and 
smoothly through their full travel.

NEEDLE-VALVE EXTENSION

The  needle-valve  supplied  with  this  engine  is 
designed  to  incorporate  an  extension  so  that, 
when  the  engine  is  enclosed  within  the 
fuselage,  the  needle-valve  may  be  adjusted 
from the outside. Cut a commercially available 
rod to the required length, bend one end to an 
L shape, insert it into needle's center hole and 
secure  it  by  tightening  the  set-screw  in  the 
needle-valve knob with 1.5mm Allen key.
Needle  Valve  Extension  Cable  Set  (Code  No. 
72200080)  is  available  from  O.S.  as  an 
optional part.

Needle Valve Extension

Cable Set

1.5mm Allen key.

Set Screw

17

INSTALLING SILENCER

Apply silicone
sealant.

Exhaust Header Pipe

Exhaust Header

Pipe Nuts

Screw  the  exhaust  header  pipe  in  the 
cylinder  head  to  the  bottom  and  secure  it 
with  the  nut.  (A  short  screw  in  depth  may 
damage  the  threads  of  the  cylinder  head 
due to vibration.)

1.

Screw  the  silencer  on  the  exhaust  header 
pipe more than 8mm (10 turns) and secure 
it with the nut. (A short screw in depth may 
break  the  silencer  or  header  pipe  due  to 
vibration.)  The  distance  between  silencer 
and  cylinder  head  can  be  adjusted  by 
approximately 7mm by screwing the silencer 
on  or  out  the  header  pipe.  Adjust  the 
silencer position by rotating the silencer.

2.

3. Apply  silicone  sealant  to  the  threads  to 

prevent  the  silencer  and  header  pipe  from 
loosening and leaking oil.

Summary of Contents for FSA-81-P

Page 1: ...ns supplied with the aircraft radio control equipment etc are accessible for checking at the same time FOUR CYCLE ENGINE FOR PUMP SYSTEM 1 CONTENTS 2 6 7 8 9 10 13 20 21 27 28 34 35 36 37 38 17 18 SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O S ENGINE NOTES WHEN APPLYING AN ELECTTRIC STARTER ABOUT THE ENGINE ENGINE PARTS NAME BEFORE STARTING INSTALLATION INSTALLING SILENCER FUEL TANK LINES PROPELL...

Page 2: ...sonous Do not allow it to come into contact with the eyes or mouth Always store it in a clearly marked container and out of the reach of children Never operate your engine in an en closed space Model engines like auto mobile engines exhaust deadly carbon monoxide Run your engine only in an open area Model engines generate considerable heat Do not touch any part of your engine until it has cooled C...

Page 3: ...s check the tightness of the propeller nut and retighten it if necessary before restarting the engine Also check the tightness of all the screws and nuts before restarting the engine If you install a spinner make sure that it is a precision made product and that the slots for the propeller blades do not cut into the blade roots and weaken them Preferably use an electric starter The wearing of safe...

Page 4: ...0 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 Keep the propeller pointed away from you and walk well clear of spectators Warning Immediately after a glowplug ignition engine has been run and is still warm conditions sometimes exist whereby it is just possible for the engine to abruptly res...

Page 5: ...t models but also for aerobatic models which require stable power and linear throttle response O S pump system is easy to handle because it supplies fuel direct to the carburetor without pressurizing the fuel tank Be sure to vent the fuel tank New lubricating system eliminates the need for breather tubing from the crankcase The F 5030 silencer and Type F plug are supplied as standard Glowplug Type...

Page 6: ...esirable Use a heavy duty well balanced spinner either of metal or plastic Spinner FUEL The FS 81 P 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 little on the rich side at the factory ...

Page 7: ... tank O S Super Filters large and small are available as optional extras O S Super Filter Fuel Can Filter S To prevent the pickup from adhering to the tank wall under suction and restricting fuel flow slots may be filed in the end of the weight Alternatively an O S Non Bubble Weight is available as an optional extra O S Non Bubble Weight 13 It is recommended to install a good in line filter betwee...

Page 8: ...their top surfaces are in the same plane 15 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 4mm steel nuts 4mm steel screw Spring washer or lock washer 15mm min 15mm min Hardwood such as cherry or maple Spring washer 3 5mm steel Allen screw Make sure that these mounting beams...

Page 9: ...end to an L shape insert it into needle s center hole and secure it by tightening the set screw in the needle valve knob with 1 5mm Allen key Needle Valve Extension Cable Set Code No 72200080 is available from O S as an optional part Needle Valve Extension Cable Set 1 5mm Allen key Set Screw 17 INSTALLING SILENCER Apply silicone sealant Exhaust Header Pipe Exhaust Header Pipe Nuts Screw the exhaus...

Page 10: ... in particular may result in a serious burn Keep your hands and face away from exhaust gas or you will suffer a burn Reminder 1 2 3 O Ring O Ring 19 FUEL TANK LINES 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 Plug commercially available For Pump Approx 10mm Use a su...

Page 11: ...en it is necessary to replace Carefully install plug finger tight before final tightening with the correct size plug wrench GLOWPLUG The role of the glowplug Glowplug life Particularly in the case of very high performance engines glowplugs must be regarded as expendable items However plug life can be extended and engine performance maintained by careful use i e Install a plug suitable for the engi...

Page 12: ... the fuel system Dirt inside the pump or regulator no matter how small may obstruct the flow of fuel and prevent these components from working properly ALWAYS use fuel filters Keep the fuel tank scrupulously clean and filter all fuel as it enters the tank e g via an O S Super Filter Code No 72403050 and use a good quality in line filter between the tank and pump Remember to inspect filter screens ...

Page 13: ...nder head NOTE Check that the current to the glowplug is switched off 2 25 To close the needle valve turn it clockwise while to open the needle valve turn it counter clockwise Turn the needle valve clockwise slowly until it stops This is the fully closed position 3 Open the needle valve 1 5 2 turns from the fully closed position and set the throttle in the fully open position 4 Apply the starter a...

Page 14: ...end for flying your model 1 2 Open the needle valve 1 5 2 turns from the fully closed position and start the engine 3 Open the throttle slowly to the mid speed position and disconnect the current to the glowplug 4 Now open the throttle slowly to the fully opened position and run the engine for no more than 5 seconds with the needle valve tuned to produced near maximum r p m then immediately slow t...

Page 15: ...to be readjusted to a richer setting 7 29 IDLE MIXTURE ADJUSTMENT Start the engine open the throttle fully and set the needle valve slightly rich 30 45 from the highest r p m setting Close the throttle to the idle position Allow the engine to idle for about 5 seconds then reopen the throttle The engine should accelerate smoothly back to full speed If instead the engine responds sluggishly and emit...

Page 16: ...uire 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 Feeler gauge 0 04mm The kit comes in a plastic case and includes Code No 72200060...

Page 17: ...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 5 10 seconds with the electric starter Finally inject some after run oil through the glowplug hole and turn the engine over several times by hand 33 When the engine is not to ...

Page 18: ...44804100 44714100 44868000 44882000 45903400 45903200 45906000 44805000 46103100 72508100 44807030 44802000 45630000 44801000 45231100 45962000 44801100 44066000 44866100 24881824 45564000 26731002 46120000 44808000 29008219 45910100 44825000 44825100 44825400 44625410 23081706 44825200 45626030 71615009 Rocker Cover Rocker Arm Retainer 2pcs Rocker Support 1pc Rocker Arm 1pc Tappet Adjusting Screw...

Page 19: ... 6 1 6 2 7 8 9 9 1 10 29481900 29481970 24981837 26381501 27381940 26711305 44882100 22681953 46115000 45581820 45582300 46066319 24881824 44882200 22081408 44381300 26381501 45581700 Needle Valve Assembly Needle Assembly O Ring 2pcs Set Screw Needle Valve Holder Assembly Ratchet Spring Carburetor Body Fuel Inlet No 1 Carburetor Rubber Gasket 1pc Rotor Guide Screw Mixture Control Valve Assembly O ...

Page 20: ...45910300 72200130 BOOSTER TERMINAL KIT 5 16 M4 72200060 72109680 M11 IN COWL HEADER PIPE INVERTED 80D IN COWL EXHAUST HEADER PIPE M11 IN COWL HEADER PIPE SIDE 60D 72109690 72200080 Needle Valve Extension Cable Set 39 13 26 cc 0 809 cu in 27 7 mm 1 091 in 22 0 mm 0 866 in 2 200 10 000 r p m 1 28 hp 10 000r p m 570 g 20 11 oz 54 g 1 9 oz UNF5 16 24 55 5 101 5 52 30 5 21 50 21 4 4 2 10 36 40 97 M11x0...

Page 21: ...right 2009 by O S Engines Mfg Co Ltd All rights reserved Printed in Japan 60092240 110902 6 15 3 Chome Imagawa Higashisumiyoshi ku Osaka 546 0003 Japan TEL 06 6702 0225 FAX 06 6704 2722 URL http www os engines co jp ...

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