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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  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.

It  is  suggested  that  any  instructions  supplied  with 
the  aircraft,  radio  control  equipment,  etc.,  are 
accessible for checking at the same time.

1

CONTENTS

SAFETY INSTRUCTIONS AND WARNINGS ABOUT 
YOUR O.S. ENGINE

ENIGNE CONSTRUCTION,
NOTES WHEN APPLYING AN ELECTRIC STARTER

INTRODUCTION, INSTALLATION

BEFORE STARTING

ADVICE ON SELECTION OF FUEL, GLOW 
PLUG & PROPELLER

STARTING THE ENGINE,
RUNNING-IN (Breaking-in)

TROUBLE SHOOTING WHEN 
THE ENGINE FAILS TO START

CARE AND MAINTENANCE

10LA ENGINE EXPLODED VIEW &
PARTS LIST 

15LA ENGINE EXPLODED VIEW 
& PARTS LIST 

25LA ENGINE EXPLODED VIEW 
& PARTS LIST 

CARBURETTOR EXPLODED 
VIEW & PARTS LIST

O.S. GENUINE PARTS & ACCESSORIES

2-6

7-8

9-12

13-15

16-17

18-29

29-30

31

32-33

34-35

36-37

38-39

CARBURETTOR

15/25LA CARBURETTOR 
AIR-BLEED ADJUSTMENT

40-41

42-44

45-46

THREE VIEW DRAWING

47-48

Summary of Contents for MAX-10LA

Page 1: ...trol equipment etc are accessible for checking at the same time 1 CONTENTS SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O S ENGINE ENIGNE CONSTRUCTION NOTES WHEN APPLYING AN ELECTRIC STARTER INTRODUCTI...

Page 2: ...onous 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 e...

Page 3: ...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 s...

Page 4: ...paring 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 spectat...

Page 5: ...0 years experience in the design and production of model internal combustion engines Advanced modern precision machinery top quality materials and the efforts of highly skilled craftsmen and technicia...

Page 6: ...um Tighten second nut firmlydown onto first nut Tighten this nut first Steel washer 3mm steel nuts 3mm steel screw Spring washer or lock washer 12mm min 12mm min Hardwood such as cherry or maple Sprin...

Page 7: ...ories etc The following items are necessary for operating the engine Fuel Model glowplug engine fuel of good quality preferably containing a small percentage of nitromethane See Advice on selection of...

Page 8: ...rom adhering to the tank wall under suction and restricting fuel flow slots may be filed I the end of the weight Alternatively O S Non Bubble Weight is available as an optional extra It is recommended...

Page 9: ...cal experiment Trainer Sport LA Series Never touch or allow any object to come into contact with the rotating propeller and do not crouch over the engine when it is running Running in Reminder 17 GLOW...

Page 10: ...nal extra part Wrench Alternatively a spinner assembly enclosing the propeller boss may be used but make sure that it isof sturdy construction and that the spinner shell does not loosen when the start...

Page 11: ...or to choke intake Turn the propeller two revolutions while watching fuel line 7 Priming When the engine is being started for the first time turn the propeller two revolutions after fuel reaches the f...

Page 12: ...ect battery leads as shown polarity is immaterial 23 12 Apply electric starter Check that the throttle is one third open from the fully closed position Bring the starter into contact with the spinner...

Page 13: ...re disconnected close the needle valve a little approx 45 further and restart the engine 16 Needle valve adjustment 2 As the needle valve is closed beyond the initial readjustment the rpm of the engin...

Page 14: ...pm is reached and will fall off or engine will stop if needle valve is closed any further Exhaust gas will be very light Finally exhaust note is now a steady high pitched sound rising higher in pitch...

Page 15: ...he engine installed in the model The process is as follows 29 1 Start the engine and with the throttle fully open open the needle valve an extra half turn 180 from the optimum setting This will produc...

Page 16: ...n from maximum r p m setting Yes No Yes Engine stops Engine stops Engine stops 31 15 25LA CARBURETTOR AIR BLEED ADJUSTMENT Pre Flight Check Start engine and adjust needle valve as previously described...

Page 17: ...t priming procedure referring to 7 Priming Close needle valve half turn 180 and wait for several minutes then re start Priming is not necessary Make sure that tank is filled with fuel Check that there...

Page 18: ...lem 35 Do not close the needlevalve and air bleed screw too far as this will cause a lean setting and over heating of the engine This can in turn create nitromethane oxide leading to internal rusting...

Page 19: ...00 20810007 21109005 21758000 21620006 21001000 21001010 21002000 21007000 21781970 24981837 26381501 21014000 21013000 71605300 21225000 22681957 22325300 21125409 1 8 Description Code No No Cylinder...

Page 20: ...0007 21109005 21758000 21620006 21751000 21751010 21752000 21757000 21757100 26711305 21781970 24981837 26381501 21714100 21713000 71605300 21225000 22681957 22325300 21225400 1 10 Description Code No...

Page 21: ...000 23210007 24009000 22558000 22020001 22551000 22551010 22302000 22557000 22557100 26711305 24081970 24981837 26381501 22564000 22563000 71605300 22325020 22681957 22325310 22625404 Description Code...

Page 22: ...tions are subject to alteration for improvement without notice 43 1 1 1 2 3 4 5 6 7 22081408 22081313 21781200 21783600 21783100 21783300 21015001 23081706 N M3x6 N M2x14 N M3 5x5 N M2x6 1 1 1 2 3 4 5...

Page 23: ...ons are subject to alteration for improvement without notice Description 45 71909410 73101000 1 4 28 for 10LA for 25LA 71909310 for 15LA 71908100 21125108 for 10 15LA 22325100 for 25LA 21225030 for 10...

Page 24: ...specifications are subject to alteration for improvement without notice 23 38 6 11 7 44 3 27 5 23 5 20 62 15 9 23 2 M5x0 8 33 2 11 31 4 38 7 19 2 4 3 3 2 2 8 47 MAX 10LA THREE VIEW DRAWING Displaceme...

Page 25: ...0 61 hp 15 000 r p m 197g 6 94 oz 25LA SPECIFICATIONS Displacement Bore Stroke Practical R P M Power output Weight 2 49 cc 0 1517 cu in 15 2mm 0 598 in 13 7mm 0 539 in 2 500 18 000 r p m 0 41 ps 0 42...

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