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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  rotating 
propeller. Stop the engine before attempting to make other adjustments to the carburettor.

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 sleeves, scarves, etc.) do not come into contact with the propeller. 
Do not carry loose objects (such as pencils, screwdrivers, etc.) in a shirt pocket from where they could fall through 
the propeller arc.

Do not start your engine in an area containing loose gravel or sand. The propeller may throw such material in your 
face and eyes and cause injury.

For their safety, keep all onlookers (especially small children) well back (at least 20 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  restart  if  the  propeller  is  casually  flipped  over  compression 
WITHOUT the glowplug battery being reconnected. Remember this if you wish to avoid the risk of a painfully rapped 
knuckle!

NOTES

5

INTRODUCTION

INSTALLING THE GLOW PLUG

Glow plug

Carefully  insert  plug,  with  washer, 
fingertight  only,  before  final  tightening 
with the correct size plug wrench.

Washer

BASIC ENGINE PARTS

Cylinder Head

Drive Hub

Propeller Washer

Propeller Nut

Lock Nut

Carburettor Type 8AA(RN) 

Cover Plate

Crankcase

Beam Mount

This 'RN' version of the MAX-BGX-1 RING is fitted, as stan-
dard, with a 'remote' needle-valve, mounted at the back of 
the  engine, safely distanced from the propeller. 
This device was origonated by OS several years before be-
ing adopted by a number of other manufacturers.

M5x15

BEFORE INSTALLING THE REMOTE NEEDLE

Connect  the  needle-valve  to  carburettor  jet  nozzle  with  sili-
cone  tubing  supplied.  In  the  event  of  the  tubing  becoming 
damaged,  it  should  be  replaced  with  78mm  length  of  5mm 
ODX2mm ID silicone tubing.

Fit the remote needle to the attachment bracket as shown in 
the photo.

When  beam-mounting  the  engine  in  the  model,  bolt  the  en-
gine to the bearers along with the attachment bracket. Please 
refer to the INSTALLATION section of the engine instructions 
when installing the engine.

Beam Mount

Backplate Mount

Remote Needle

Silicone Tube

Remote Needle
Valve Bracket

M5 Nut

Glowplug No.8

Crankshaft

Summary of Contents for Max-BGX-1 Ring

Page 1: ...aircraft radio control equipment etc are accessible for checking at the same time 1 CONTENTS 15 SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O S ENGINE INTRODUCTION BASIC ENGINE PARTS INSTALLATION THROTTLE LINKAGE INSTALLATION OF SILENCER MUFFLER FUEL TANK LOCATION GLOWPLUGS FUEL PROPELLER MIXTURE CONTROLS STARTING RUNNING IN Breaking in MIXTURE CONTROL ADJUSTMENT CHART SUBSEQUENT READJUSTMENT CARB...

Page 2: ...your engine in an enclosed space Model engines like automobile 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 Contact with the muffler silencer cylinder head or exhaust header pipe in particular may result in a serious burn 3 NOTES This engine was designed for model aircra...

Page 3: ...diately 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 restart if the propeller is casually flipped over compression WITHOUT the glowplug battery being reconnected Remember this if you wish to avoid the risk of a painfully rapped knuckle NOTES 5 INTRODUCTION INSTALLING THE GLOW PLUG Glow plug Careful...

Page 4: ...2 Allen screwa provided Bolt the complete engine and backplate mount assembly to the firewall using the six M5x25 Allen screws toothed lock washers and blind nuts supplied Firewall Toothed lock washer M5x25 O ring Backplate mount At least 15mm rigid hard plywood M5 Blind nut 6 5mm hole M5x22 100mm 7 Before connecting the throttle lever servo linkage make sure that no part of the linkage interferes...

Page 5: ...Starting qualities deteriorate 9 FUEL Model engine fuel is poisonous 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 ...

Page 6: ... the first few times known as running in or breaking in This is because the working parts of a new engine take some time to settle down after being subjected to high temperatures and stresses Therefore it is vitally important to complete the break in before allowing the engine to run continuously at high speed and before finalizing carburettor adjustments However because O S engines are produced w...

Page 7: ...dle valve settings i e ignition of the fuel charge takes place at every fourth stroke of the piston instead of at every second stroke 1 2 3 4 5 6 7 13 MIXTURE CONTROL ADJUSTMENT CHART Start the engine Make sure that the throttle is fully open Adjust the neede valve Close the throttle gradually Find the idling position Fix the idling position Open the throttle fully Does the engine regain full powe...

Page 8: ...O S Super Filters large and small are available as optional extras to deal with this problem One of these filters fitted to the outlet tube inside 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 needle valve Do not forget to clean the filters regularly to remove dirt and lint ...

Page 9: ...00 29308000 29208200 29320000 46231000 29301000 71704230 28282000 28281970 24981837 26381501 26711305 46181950 29330000 29302000 29314010 29307000 29313000 71919000 71608001 29325000 29325300 29325400 29326000 The specifications are subject to alteration for improvement without notice C M4x20 N M5x15 C M5x10 S M3x3 1 2 3 4 5 6 7 8 9 10 10 1 11 12 13 14 15 15 1 15 2 15 3 15 4 15 5 16 17 18 19 20 17...

Page 10: ...3 8 M5 S GLOWPLUG 71608001 No 8 A5 71605100 SILICONE TUBE ASSEMBLY 72102300 EXHAUST HEADER PIPE 72102200 T 6000 TUNED SILENCER 72102010 55500004 M5 79870050 M5 72200080 NEEDLE VALVE EXTENSION CABLE SET The specifications are subject to alteration for improvement without notice 19 Dimensions mm Specifications THREE VIEW DRAWING Displacement Bore Stroke Practical R P M Output Weight 34 97 cc 2 13 cu...

Page 11: ...served Printed in Japan TEL 06 6702 0225 FAX 06 6704 2722 6 15 3 Chome Imagawa Higashisumiyoshi ku Osaka 546 0003 Japan 60090440 061102 URL http www os engines co jp U N E Q U A LLED QUALITY PRECISION PERFOR M A N C E E S T A BLISHING THE STANDARDS OF EXCELLE N C E ...

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