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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  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.

SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINE

The  advice  which  follows  is  grouped  under  two  headings  according  to  the 
degree of damage or danger which might arise through misuse or neglect.

WARNINGS

NOTES

These  cover  events  which 
might  involve  serious  (in 
extreme  circumstances,  even 
fatal) injury.

These  cover  the  many  other 
possibilities,  generally  less  obvious 
sources of danger, but which, under 
certain  circumstances,  may  also 
cause damage or injury.

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WARNINGS

Never  touch,  or  allow  any 
object  to  come  into  contact 
with, the rotating parts.

Model engine fuel is poison-
ous. 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.

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.

Model 

engines 

generate 

considerable  heat.  Do  not 
touch  any  part  of  your 
engine  until  it  has  cooled. 
Contact  with  the  muffler 
(silencer),  cylinder  head  or 
exhaust  header  pipe,  in 
particular,  may  result  in  a 
serious burn.

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.

Summary of Contents for MAX-91SX-HRING C Spec PS VIPER

Page 1: ...LE SERVO CARE AND MAINTENANCE EXPLODED VIEW PARTS LIST O S GENUINE PARTS ACCESSORIES THREE VIEW DRAWING MEMO 7 8 13 16 30 10 36 22 24 24 27 29 32 35 37 38 It is of vital importance before attempting t...

Page 2: ...many other possibilities generally less obvious sources of danger but which under certain circumstances may also cause damage or injury 3 WARNINGS Never touch or allow any object to come into contact...

Page 3: ...head down securely Take care that the glow plug clip or battery leads do not come into contact with rotating parts Adjust the throttle linkage so that the engine stops when the throttle stick and tri...

Page 4: ...oove onto the connecting rod BDC position Rotate the crankshaft so that the connecting rod comes to this position 7 Note on installing the engine Note on heating the glow plug Cooling fan cover from s...

Page 5: ...h torque type starter DO NOT however confuse tightness with the symptoms of hydraulic lock caused by an excess of fuel within the cylinder often the result of over priming Attempting to force the engi...

Page 6: ...the under surfaces of the engine s mounting lugs are in contact with the engine mount 11 ABOUT THE PUMP SYSTEM Please understand the pump construction before piping Pump functions in accordance with t...

Page 7: ...el in the pump Stop the fuel flow to the pump with the stopper and run the engine at idling to use out the fuel in the pump After stopping the engine rotate the engine by electric starter to eject fue...

Page 8: ...1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1...

Page 9: ...and connections carefully for any cracks on the tubes and loose connections as the engine runs ejecting excess fuel 17 4 Glowplug battery The power source for heating the glowplug may be either a lar...

Page 10: ...is disconnected the heat retained within the combustion chamber remains sufficient to keep the plug filament glowing thereby continuing to keep the engine running Ignition timing is automatic under re...

Page 11: ...Ixture Control Screw Lean With a model helicopter adjustments may vary due to various factors such as climatic conditions fuel muffler main rotor weight of the model gear ratio etc 89 degrees When the...

Page 12: ...ating a dangerous situation 23 In case the engine does not stop Hold the rotor head and pinch the fuel line to stop the fuel supply If it still does not stop pull off the fuel line from the carburetor...

Page 13: ...15 30 nitromethane Bear in mind that fuels containing relatively large percentages of power boosting nitromethane operate at richer mixture settings than are needed for mild fuels and will therefore r...

Page 14: ...se at medium r p m e g hovering speeds is most important since this is a power range widely used in helicopter flight The optimum fuel air nixture strength at medium speeds is dependent on obtaining b...

Page 15: ...mostly accumulate here SUBSEQUENT READJUSTMENTS Once the engine has been run in and the carburetor controls properly set up it should be unnecessary to alter the mixture settings except to make minor...

Page 16: ...re Close the High Speed Needle Valve Turn clockwise Land the model Idle for approx 10 seconds then reopen throttle to observe transition Float the model Idling OK Lean mixture Rich mixture High Speed...

Page 17: ...ide your refueling container will prevent the entry of foreign material into the fuel tank It is also recommended that a good in line filter be installed between the tank and carburetor 1 Finally inje...

Page 18: ......

Page 19: ...881810 27881800 27881820 45581820 29084100 27881330 27681340 27081900 27981910 24981837 46181940 46181941 26711305 46181950 Ratchet Spring Needle Needle Valve Assembly Fuel Inlet Rotor Guide Screw O R...

Page 20: ...MP 10set Cap Screw Set M2 6x5 10pcs set 79871010 M3 5x10 79871070 7091 71530500 For 70SZ H 91SX H Needle Adjusting Screw 5pcs M2 6x5 41621100 37 THREE VIEW DRAWING Displacement Bore Stroke Practical R...

Page 21: ...d in Japan 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 U N E Q U A LLEDQ U A LIT Y P R E C IS IO N P E R F O R M A N C...

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