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. q 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.

CONTENTS

SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINE INTRODUCTION INSTALLATION OF THE ENGINE INSTALLATION OF SILENCER NEEDLE-VALVE LOCATION BEFORE STARTING ADVICE ON SELECTION OF FUEL, GLOW PLUG & PROPELLER STARTING THE ENGINE RUNNING-IN (Breaking-in) 2~10 10~12 12~14 14~CARBURETTOR EXPLODED VIEW & PARTS LIST THREE VIEW DRAWING 36 37~38 CARBURETTOR CARBURETTOR AIR-BLEED ADJUSTMENT TROUBLE SHOOTING WHEN THE ENGINE FAILS TO START CARE AND MAINTENANCE OPTIONAL PARTS & ACCESSORIES ENGINE EXPLODED VIEW & PARTS LIST 23~24

25 26~29 30~35

SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINE
Remember that your engine is not a "toy", but a highly efficient internalcombustion 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. 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

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.
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.
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.
weakened or loose propeller may disintegrate or be thrown off and, since propeller tip speeds with powerful engines may exceed 600 feet(180 metres) per second, it will be understood that such a failure could result in serious injury, (see 'NOTES' section relating to propeller safety). 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. 3
Never operate your engine in an enclosed space. Model engines, like automobile engines, exhaust deadly carbonmonoxide. 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.
Model engine fuel is poisonous. Do not
engine was designed for model aircraft. Do not attempt to use it for any other purpose.
If you remove the glowplug from the engine
and check its condition by connecting the battery leads to it, do not hold the plug with bare fingers.Use an appropriate tool or a folded piece of cloth.
Mount the engine in your model securely,
following the manufacturers' recommendations, using appropriate screws and locknuts. sure to use the silencer (muffler) supplied with the engine. Frequent exposure to an open exhaust may eventually impair your hearing. Such noise is also likely to cause annoyance to others over a wide area.
a top-quality propeller of the diameter and pitch specified for the engine and aircraft. Locate the propeller on the shaft so that the curved face of the blades faces forward-i.e. in the direction of flight. Firmly tighten the propeller nut, using the correct size wrench.
Always check the tightness of the propeller
nut and retighten it, if necessary, before restarting the engine, particularly in the case of four-stroke-cycle engines. If a safety locknut assembly is provided with your engine, always use it. This will prevent the propeller from flying off in the event of a "backfire", even if it loosens. If you fit 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. use an electric starter. The wearing of safety glasses is also strongly recommended.

Discard any propeller which has become
split, cracked, nicked or otherwise rendered unsafe. Never attempt to repair such a propeller: destroy it. Do not modify a propeller in any way, unless you are highly experienced in tuning propellers for specialized competition work such as pylon-racing.
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.

Preferably,

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.
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.
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. Immediately after a glowplugignition 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!

Warning!

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.

INTRODUCTION

THE MAX-40LA, 46LA and 65LA have been developed to meet the requirements of beginners and sport flyers. Of modern design and having a separate needle-valve unit mounted at the rear, where manual adjustment is safely remote from the rotating propeller, they offer the advantages of reliability and easy handling, at lower cost. Like all O.S. engines they are built to standards of engineering excellence that have evolved through more than 60 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 technicians are combined to ensure a continuation of the levels of performance, durability and reliability for which O.S. is world famous. The MAX-46LA has a larger cylinder diameter, but both the 40LA and 46LA engines have the same external dimensions. The 'midnight blue' external finish may be decolorized by very high surface temperature or by certain solvents. Such decolorization does not affect engine perfor-mance, however.

Cylinder head

Glowplug Needle valve

Carburettor

Fuel outlet

Propeller nut

Cover Plate
Fuel inlet Drive Hub Crankshaft Propeller washer Crankcase

Silicone Tube

Connect the short length of fuel tubing supplied securely between the fuel outlet and the fuel inlet. In the event of the tube becoming damaged, it should be replaced with a suitable length of best quality 5mm ODX2mm ID silicone tubing. Use similar material to connect the fuel inlet nipple to the fuel tank.

INSTALLATION

Installation in the model
A typical method of beam mounting is shown below,left. O.S. radial motor mount (Available as an optional extra part. See parts list)
How to fasten the mounting screws.
3mm steel nuts (40-46LA) 4mm(65LA) Spring washer or lock washer Tighten second nut firmly down onto first nut. Tighten this nut first.
Hardwood such as cherry or maple. Steel washer
At least 12mm(1/2") At least 12mm(1/2")40-46LA 15mm(5/8")65LA Rigid hardwood (e.g. maple)
3.5mm steel screw (40-46LA) 4mm(65LA)
Make sure that the mounting beams are parallel and that their top surfaces are in the same plane. CORRECT INCORRECT

Hardwood mounting beams

3mm steel Allen screw Spring washer

Front view

Side view
Top surfaces are not in the same plane. Re-align the surfaces as necessary
Opposite beam Top surfaces are not in the same plane. Engine does not seat firmly.
Top surfaces are in the same plane.
O.S. radial motor mount (cast aluminum)

NEEDLE-VALVE EXTENSION

The needle-valve supplied with these engines 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.

Assembly screw

Cone baffle Turn to requlred position Exhaust outlet

Exhaust pressure nipple Locknut

INSTALLATION OF SILENCER

The angled exhaust of the silencer can be rotated to any desired position in the following manner: 1) Loosen the locknut and assembly screw. 2) Set the exhaust outlet at the required position by rotating the rear part of the silencer. 3) Re-tighten the assembly screw, followed by the locknut. The standard silencer is quite effective but reduces power to some degree.
Reminder! 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.

NEEDLE-VALVE LOCATION

As delivered from the factory, the MAX-40LA, 46LA & 65LA have the needle-valve assembly installed vertically. However, if more convenient for a particular installation, the needle-valve may be reinstalled horizontally. The procedure for relocating the needle-valve is as follows:
1. Remove the two cover-plate screws which secure the needle-valve assembly bracket, then carefully remove the two screws by which the needle-valve unit is attached to the bracket. 2. Rotate the needle-valve unit through 90 and reattach it to the bracket in the required position (see sketch right ). Note: As self-tapping screws are used for unit attachment, screw them in carefully so that screw threads match those of the unit body precisely. 3. Finally, secure the complete assembly to rear cover plate as before.

BEFORE STARTING

Tools, accessories, etc. The following items are necessary for operating the engine. 1 Fuel Model glowplug engine fuel of good quality, preferably containing a small percentage of nitromethane. (See "Advice on selection of fuel, glowplug and propeller") 2 Glowplug O.S. A3 glowplug is installed in the engine. 3 Propeller Suggested size is 11X5 (40LA), 11X6 (46LA), or 12X6 (65LA). 4 Glowplug battery The power source for heating the glowplug may be either a large heavy-duty 1.5volt dry cell, or preferably, a 2-volt rechargeable lead-acid cell (accumulator).
If a 2-volt cell is employed, use a resistance wire, as shown, to reduce applied voltage, otherwise the element will overheat and burn out. 1.5 volt heavy-duty or 2 volt rechargeable dry battery lead-acid cell (at least 5Ah)

Needle Valve unit Cover plate fitting holes
Needle-Valve Assembly Bracket
Vertical position (Factory position) Horizontal position Needle Valve unit attachment screws
Warning (Very hot) Never touch the nichrome wire while the battery is connected.
Resistance coil (nichrome wire)
to ge ss. e olta er v ightn Low uce br red e Raisage to volt ease. cr tness in h brig

Battery leads

Adjust applied voltage by changing the position of clip on resistance coil until glowplug element is glowing bright red.
5 Plug wrench Used for tightening glowplug. The O.S. long plug wrench is available as an optional accessory. 6 Battery leads These are used to conduct current from the battery to the glowplug. Basically, two leads, with clips, are required, but, for greater convenience, twin leads with special glowplug connectors, as shown on the right, are commercially available.
7 Fuel tank For installation in the model, a 200cc(7oz.) for 40.46LA, or a 350cc(12oz.) for 65LA, is suggested. 8 Fuel bottle or pump For filling the fuel tank, a simple, polyethylene "squeeze" bottle, with a suitable spout,is all that is required. Alternatively, one of the purpose-made manual or electric fuel pumps may be used to transfer fuel directly from your fuel container to the fuel tank. 9 Fuel can filter Fit a filter to the outlet tube of your refuelling container to prevent entry of foreign matter into the fuel tank. (Refer to of STARTING 4 THE ENGINE section.)

For tightening glowplug

Fuel bulb

Battery leads Fuel pumps

Electric Fuel Can Filter

Manual

12V Battery

Starter

10 Silicone tubing This is required for the connection between the fuel tank and engine. 11 Electric starter and starter battery An electric starter is recommended for starting. Fuel and pressure lines Connect suitable lengths of silicone tubing, as illustrated, after installing the engine.
Fuel lines and position of fuel tank Pay attention to tank height Fuel level
Silencer (muffler) pressurized fuel system To reduce variation in fuel "head" and ensure steady fuel delivery at the carburettor, it is advisable to employ a silencer (muffler) pressurized fuel system, i.e. to use the silencer outlet nipple to pressurize the fuel tank as shown at left.

Reminder!

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.

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 engine. Use fuel containing a moderate percentage of nitromethane unless more is essential for racing events. Do not run the engine too lean and do not leave the battery connected while adjusting the needle.
1 Installing the glowplug
Install the washer on the glowplug and screw carefully into cylinder-head, making sure that it is not cross-threaded before tightening firmly. Glow plug
2 Installing the propeller

Washer

When to replace the glowplug
Apart from when actually burned out, a plug may need to be replaced because it no longer delivers its best performance, such as when: Filament surface has roughened and turned white. Filament coil has become distorted. Foreign matter has adhered to filament or plug body has corroded. Engine tends to cut out when idling. Starting qualities deteriorate.
First, mount the propeller on the engine by tightening the prop nut or spinner-nut lightly, and make sure of the position where compression is felt, turning the propeller counter-clockwise slowly. Then tighten firmly as explained below. For accurately centering the starter's rubber drive insert, use an O.S. solid alloy spinner-nut. (Available as an optional extra part).

STARTING THE ENGINE

Preparations 14
Alternatively, a spinner assembly, enclosing the propeller boss, may be used, but make sure that it is of sturdy construction and that the spinner shell does not loosen when the starter is used.

Wrench

Warning: When using a spinner assembly, make sure that the notches in the spinner shell are large enough to clear the propeller blades and so do not cut into and weaken the blade roots. Tighten the spinner nut firmly so that compression is first felt as indicated (i.e. with blades horizontal) when turning the propeller in the direction of arrow.

12 Heat glowplug

Starting battery
Be careful not to be hit by propeller!
Connect battery leads as shown (polarity is immaterial.)
13 Apply electric starter

11 Setting the throttle

Fully closed position 13
Fully opened position Set at this Position.
Check that the throttle is one-third open from the fully closed position. Bring the starter into contact with the spinner nut or spinner and depress the starter switch for one or two seconds. Repeat if necessary. When the engine fires, withdraw the starter immediately. Attention: Never place your finger over the carburettor intake when applying the starter. Such an action will cause an excess quantity of fuel to be drawn into the cylinder and result in hydraulic lock that may damage the engine. 14 Engine starts
If the engine does not start, refer to the TROUBLE SHOOTING CHART on page 26-27.
15 Needle-valve adjustment(1)
Slowly advance throttle to its fully open position, then gradually close the needle-valve until the exhaust sound changes from an irregular pitch (four-cycle) to a steady pitch (two-cycle). Listen to the sound carefully.
BEWARE of the rotating propeller.
In the interests of safety, keep your face and other parts of the body away from the vicinity of the propeller.
Close the needlevalve gradually until the engine sound is changing from a four-cycle into a two-cycle in pitch.
16 Disconnect battery leads
17 Needle-valve adjustment(2)
As the needle-valve is closed beyond the initial readjustment, the r.p.m. of the engine will be increased and a continuous high-pitched exhaust note, only, will be heard. Key to the needle-valve adjustment. (Turn 10-15 at a time.)
Disconnect the battery leads from the engine with care so that the plug clip does not touch the rotating pro-peller.
Turn the needle-valve 10 -15 in the direction of arrow, and wait momentarily for the change of r.p.m. After the r.p.m. of the engine increases, turn the needle-valve another 10-15 and wait for the next change of r.p.m. As the speed of the engine does not instantly change with needle-valve readjustment, small movements, with pauses between, are necessary to arrive at the optimum setting.

IMPORTANT NOTE

When fine-tuning the needle-valve to reach peak performance, take care not to run the engine too lean and cause it to overheat. Be sure to observe the simple running-in procedures described on Page 22.
If the engine stops when battery leads are disconnected, close the needle-valve a little (approx. 30) further, and restart the engine.
18 Needle-valve adjustment(Summary)
6 Practical best(optimum) needle-valve setting Clear, high-pitched two-stroke exhaust note Maximum rpm setting("Lean"). 20~"Rich" needle-valve setting when starting the engine.
d vol ec ut re io n s as s e. totart t de
On starting from cold, with the needle-valve set at the rich starting position:
a good deal of white smoke is emitted, accompanied by a relatively low-pitched "four-stroke" exhaust note. As the needle-valve is closed and the r.p.m. increases: an intermittent high-pitched two-stroke note will be superimposed on the low-pitched "four-stroke" note. Exhaust smoke will be less dense and grey in colour. Further needle-valve closure: exhaust note is now a steady high-pitched sound,rising higher in pitch as needle-valve is closed and increase. The grey smoke will be lighter. (However, make sure that engine is fully run in.) Finally: maximum rpm is reached and will fall off (or engine will stop) if needle -valve is closed any further. Exhaust gas will be very light. Now, re-open needle-valve 20-30 This will produce the practical best (i.e. optimum) rpm setting (lower than maximum rpm). A light grey exhaust emission may be observed. Take note of this position of the needle-valve.
Intermittent, high-pitched two-stroke note superimposed on low "four-stroke" sound.
4 Disconnect battery leads from glowplug at about this point. 3 Exhaust note starts to change.

E n gin e s t o ps

e Ro t
2 The engine may stop if the battery leads are disconnected from the glowplug while the engine is running rich.
Note: Although this is a two-stroke engine it fires like a four-stroke at these rich needle-valve settings-i.e. ignition of the fuel charge takes place at every fourth stroke of the piston instead of at every second stroke.
NOTE: The above sketch is for reference purposes only. Actual needle positions may differ from those shown.
Subsequent starting procedure
Once the optimum needle-valve setting has been established (see 18 "Needle-valve adjustmentSummary") the procedure for starting is simplified as follows: 1) Open the needle-valve one half-turn (180) from the optimum setting. 2) Open the throttle fully, place your finger over the carburettor intake and rotate the propeller through two revolutions to prime the engine. 3) Set the throttle one-third open from the fully closed position, energize the glowplug and apply the starter. When the engine starts, re-open the throttle and re-adjust the needle-valve to the optimum setting. Note: When re-starting the engine on the same day, provided that atmospheric conditions have not changed significantly, it may be practicable to re-start the engine on its optimum (running) setting. Also, if the engine is being re-started immediately after a run (i.e.hot), priming should not be necessary.

19 How to stop the engine
Close the throttle to reduce to the lowest possible r.p.m.
With the transmitter throttle trim lever fully retarded, adjust the throttle servo linkage so that the throttle rotor is fully closed (i.e.engine stopped) when the stick is fully retarded.
RUNNING-IN ("Breaking-in")
All internal-combustion engines benefit, to some degree, from extra care when they are run for the first few times - known as running-in or breaking-in. This is because the working parts of a new engine take a little time to settle down after being subjected to high temperatures and stresses. However, because O.S. engines are made with the aid of the finest modern precision machinery and from the best and most suitable materials, only a very short and simple running-in procedure is required and can be carried out with the engine installed in the model.The process is as follows: 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 produce a rich mixture that will result in cooler running. Allow the engine to run out a full tank on the ground. (Avoid dusty surroundings.) 2) Now fly the model with the needle-valve re-set degrees open from the optimum setting ( i.e. 40 - 60 from the highest rpm setting ). 3) Close the needle-valve very slightly on successive flights so that the engine is running on its optimum needle setting at the fifth or sixth flight.

CARBURETTOR

These engines are equipped with a throttle type carburettor which provides a wide range of engine speed control. With the throttle lever linked to a suitable servo in the model, movement of the throttle control on the transmitter will enable engine r.p.m. to be varied, proportionally, from idling speed to full power. The carburettor of your engine has been factory set for the approximate best results and no adjustment (except to the needle-valve) should be required provided that the fuel tank is correctly located, as previously described. After the engine has been runin, check the operation of the throttle according to the following chart. Re-adjust the controls only when necessary.
Start the engine. Make sure that the throttle is fully open. 20-30 open from maximum r.p.m. setting.

Adjust the neede-valve.

Close the throttle gradually. Find the idling position. The position where the lowest possible r.p.m. ,with steady running, is obtained. Set the throttle opening by means of the throttle trim on the transmitter so that the lowest practical speed, without risk of the engine stopping,is obtained.

Fix the idling position.

Re-set the idling position at a little higher r.p.m.

Open the throttle fully.

Engine stops.
Does the engine regain full power?

3. Do not leave raw fuel in the engine at the conclusion of a flying session: it may cause corrosion. The best practice is to disconnect the delivery tube from the carburettor while the engine is running. Remaining fuel in the tank should also be drained off. 4. Clean the exterior of the engine with a clean cotton cloth.If this is not done, oil and dirt will burn onto the outside of the engine each time it is run and the engine will soon become blackened. 5. If the engine is not in use for a while (more than two months) remove the glowplug and rinse out the interior with kerosene (not gasoline), by rotating the crankshaft. Shake out residue, then inject light machine-oil through the plug hole and carburettor intake, again rotating the shaft to distribute the protective oil to all working parts. Gasoline, thinner, kerosene and light machine oil cause swelling and deterioration of plastic parts, "O" rings and fuel tubing. Use methanol for cleaning these parts. 6. Avoid unnecessary dismantling of your engine.
O.S. GENUINE PARTS & ACCESSORIES s RADIAL MOTOR MOUNT s SILENCER EXTENSION s GLOW PLUG s SUPER FILTER (L)
(71906200) for 40,46LA (71905200) for 65LA

ADAPTORS

(23325100) for 40,46LA (26625340) for 65LA

(71605300)

(72403050)

s SPINNER NUT

1 /4 "-28(L) (23024009) for 40,46LA 5 /16 "-24 (45024000) for 65LA

s SUPER SILENCER

E-3030S E-4010S
(23325030) for 40,46LA (26028010) for 65LA

s LONG PROPELLER NUT SET

(73101000) for 40~46LA (73101010) for 65LA
s LONG SOCKET WRENCH s BUBBLESS WEIGHT
(Bubble Eliminating Tank Weight) (71531000)

WITH PLUG GRIP

(71521000)

EXPLODED VIEW (MAX-40LA)

N.+M3X12

N.+M3.5X5

N.+M3X8

w-3 w-1 w

w-5 w-4 w-2 w-6

Type of screw

CCap Screw MOval Fillister-Head Screw FFlat Head Screw NRound Head Screw SSet Screw
ENGINE PARTS LIST (MAX-40LA)

Description

Midnight Blue Natural Code No.

2625 404

Cylinder Head Cylinder & Piston Assembly Piston Pin Connecting Rod Carburettor Complete (40D)

5-1 Carburettor Gasket 5-2 Carburettor Retaining Screw 0 = q w w-1 w-2 w-3 w-4 w-5 w-6 e r
Propeller Nut Propeller Washer Drive Hub Thrust Washer Crankcase Gasket Set Crankshaft Cover Plate Needle Valve Assembly Needle "O" Ring(2pcs.) Set Screw Ratchet Spring Needle Valve Body Needle Valve Body Retaining Screw Needle Valve Assembly Bracket Screw Set E-3030 Silencer Exhaust Pressure Nipple Assembly Screw Retaining Screw(2pcs.)
Specifications are subject to alteration for improvement without notice.

EXPLODED VIEW (MAX-46LA)

ENGINE PARTS LIST (MAX-46LA)
5 Cylinder Head Cylinder & Piston Assembly Piston Pin Connecting Rod Carburettor Complete (40D)

Code No.

5-1 Carburettor Gasket 5-2 Carburettor Retaining Screw 0 = q w w-1 w-2 w-3 w-4 w-5 w-6 e r Propeller Nut Propeller Washer Drive Hub Thrust Washer Crankcase Gasket Set Crankshaft Cover Plate Needle Valve Assembly Needle "O" Ring(2pcs.) Set Screw Ratchet Spring Needle Valve Body Needle Valve Body Retaining Screw Needle Valve Assembly Bracket Screw Set E-3030 Silencer Exhaust Pressure Nipple Assembly Screw Retaining Screw(2pcs.)

EXPLODED VIEW (MAX-65LA)

N.+M3X18

N.+M3.5X6

S.3X3 N.+M3X12

w-3 w-2 w-4 w-5

ENGINE PARTS LIST (MAX-65LA)

1 1- 5 5-1 5-9 0

Cylinder Head Head Gasket Cylinder & Piston Assembly Piston Pin Connecting Rod Carburettor Complete(60J) Carburettor Gasket Carburettor Retauning Screw(2pcs.) Propeller Nut Propeller Washer Drive Hub Thrust Washer Crankcase Crankshaft Cover Plate Needle Valve Assembly Bracket Needle Valve Assembly Needle "O"Ring(2pcs.) Set Screw Ratchet Spring Needle Valve Body Needle Valve Body Retaining Screw Screw Set Glow Plug A3 Silencer(E-4010) Exhaust Pressure Nipple Assembly Screw Retaining Screw(2pcs.)
= q w w-1 w-2 w-3 w-4 w-5 w-6 e
CARBURETTOR EXPLODED VIEW & PARTS LIST

TYPE 40D

N.+M2.6X15 N.+M3X1- 1 1

N.+M3X6

TYPE 60J

N.+M3.5X5 6

5 N.+M2.6X6

C.M2.6X18

Description Throttle Lever Assembly Throttle Lever Retaining Screw Carburettor Rotor Air-bleed Screw Carburettor Body Throttle Stop Screw Nozzle For Remote Needle Valve Carburettor Rubber Gasket Carburettor Retaining Screw

Code No. 3081 706

Description Throttle Lever Assembly Throttle Lever Retaining Screw Carburettor Rotor Airbleed Screw Carburettor Body Throttle Stop Screw Carburettor Gasket Carburettor Retaining Screw

1 1-7 8

MAX-40LA/46LA THREE VIEW DRAWING
Dimensions(mm) 40LA SPECIFICATIONS s Displacement 6.49 cc (0.396cu.in.) 21.2 mm (0.835in.) s Bore 18.4 mm (0.724in.) s Stroke s Practical R.P.M. 2,000~16,000 r.p.m. 1.0 bhp / 15,000 r.p.m. s Power output 269g (9.5oz.) s Weight 46LA SPECIFICATIONS

s s s s s s

Displacement Bore Stroke Practical R.P.M. Power output Weight 7.64 cc (0.467cu.in.) 23.0 mm (0.906in.) 18.4 mm (0.724in.) 2,000~16,000 r.p.m. 1.2 bhp / 15,000 r.p.m. 272g (9.6oz.)
MAX-65LA THREE VIEW DRAWING
Dimensions(mm) 65LA SPECIFICATIONS s Displacement 10.85 cc (0.662 cu.in.) 24.0 mm (0.945 in.) s Bore 24.0 mm (0.945 in.) s Stroke s Practical R.P.M. 2,000~16,000 r.p.m. 1.7 bhp / 16,000 r.p.m. s Power output 535 g (18.87 oz.) s Weight

UNF5/16-24

64 35.6 42

85.91.2

UAL EQ

Q U A L IT Y

PRECISION & P ERFO RM AN

L IS H

IN G T H E

STA N D A R D S O F

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
C Copyright 2000 by O.S.Engines Mfg. Co., Ltd. All rights reserved. Printed in Japan.

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