O.S. engine MAX-120AXRING User manual

ABOUT THE ENGINE
STANDARD ACCESSORIES
Make sure that the propeller is well balanced. An
unbalanced propeller and/or spinner can cause serious
vibration which may weaken parts of the airframe or
affect the safety of the radio-controlled system.
Since the engine is intended to be started with an electric
starter, the addition of a spinner assembly for centering
the starter sleeve is desirable. Use a heavy-duty, well
balanced spinner either of metal or plastic.
Warning:
The choice of propeller depends on the design and
weight of the aircraft and the type of flying in which you
will be engaged. Determine the best size and type
after practical experimentation. As a starting point,
refer to the props listed in the accompanying table.
Slightly larger, or even slightly smaller, props than
those shown in the table may be used, but remember
that the propeller noise will increase, due to higher rpm
or if a larger-diameter / lower-pitched prop is used.
PROPELLERS
FUEL
Fuel Filter
BEFORE STARTING
It is recommended to install a good in-line filter between the
fuel tank and carburetor to prevent entry of foreign matter
into the carburetor.
To prevent the pickup from 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.
O.S. Non-Bubble Weight
O.S. Super Filter (Fuel Can Filter)
Install a filter on the outlet tube of your refueling container to
prevent entry of foreign matter into fuel tank. O.S. ‘Super
Filters’ (large and small) are available as optional extras.
GlowPlug Igniter
Commercialy available handy glowplug heater in which
the glowplug battery and battery leads are integrated.
Fuel Pump
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.
Electric Starter and Starter Battery
Required when starting the engine.
A fuel tank of approximately 350cc capacity is suggested.
This allows around 10-12 minutes flying time, dependent
upon the type of fuel used, the size of propeller and on
the amount of full-throttle to part-throttle operation
throughout the flight.
Fuel Tank
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.
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!
Always 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
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.
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 carburetor.
This engine was designed for model aircraft. Do not
attempt to use it for any other purpose.
Mount the engine in your model securely, following
the manufacturers' recommendations, using appropri-
ate screws and locknuts.
Be 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.
Install 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.
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.
NOTES
Model engine fuel is poisonous. Do not
allow it to come into contact with the eyes
ormouth.Alwaysstoreitinaclearlymarked
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.
A 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).
Never operate your engine in an enclosed space.
Model engines, like automobile engines, exhaust
deadly carbon-monoxide. Run your engine only in
an open area.
It is of vital importance, before attempting to operate your
engine, to read the general 'SAFETY INSTRUCTIONS
AND WARNINGS' in the following section 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.
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.
WARNINGS
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.
SIZE(DxP) 15x10-12, 16x8-10
SPINNER
MAX-120AXRING
Two versions are available, the one is without
silencer, extension adaptor and 90 degree adaptor
and the other is with all of them.
This is a high performance two stroke engine designed
for sport and scale models.
Crankcase and cylinder head are of aero-shape design
which give advantage of light weight, compact size.
The new 70D carburetor needlevalve assembly has
now been angled backward for safety.
New E-5020 silencer (POWER BOX) develops very
effective muffling. Also, the compact body enables it
to be fit with in most cowls.
Extension adaptor and 90 degree adaptor offer
various silencer installations.
Glow Plug No.8
E-5020 Silencer Extention Adapter
Needle Valve Extension Cable Set
Silencer Extention Adapter
Retaining Screw (M4x90 2pcs.)
E-5020 Silencer Assembly
Silencer Retaining Screw (M4x45 2pcs.)
E-5020 Silencer 90 Adapter
Silencer 90 Adapter Retaining
Screw (M4x20 2pcs.)
The 120AX 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 for a fuel containing 20%
lubricant and 15% nitromethane.) Some commercial
fuels also contain coloring additives as an aid to fuel level
visibility. In some cases, these additives have indicated
slightly negative effects on the performance. We would
suggest that you use such fuels only if you are satisfied
that they do not adversely affect running qualities when
compared with familiar standard fuels.
When changing to a fuel brand or formula that is different
from the one to which you are accustomed, it is a wise
precaution to temporarily revert to in-flight running-in
procedures, until you are sure that the engine is running
entirely satisfactorily.
2 CYCLE ENGINE
600917300000

BASIC ENGINE PARTS
Cylinder head
Carburetor
Type 70D
Crankshaft
Propeller nut
Propeller washer
Crankcase
Cover Plate
Glowplug
Beam Mount
Drive Hub
INSTALLATION
It is suggested to use as heavy and rigid as possible
engine mounting for highest performance and safe
running. Install the engine on a plastic mount using at
least 4mm steel screws, such as Allen type, with
locknuts, for bolting the engine to the bearers.
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.
Make sure that these mounting beams are
accurately aligned and firmly integrated with the
airframe, reinforcing the adjacent structure to absorb
vibration. Use 4mm or larger steel screws,
preferably Allen type hexagon socket head cap
screws, with washers and locknuts, for bolting the
engine to the bearers.
O.S. Radial Motor Mount
A special O.S. radial motor mount (Code No.71904200)
is available, as an optional extra, for use where firewall
type mounting is required.
1)
2)
3)
Recommended for easy removal and replacement of the
angled and recessed glowplug, the O.S.Long Socket
Wrench incorporates a special grip.
Long Socket Wrench With Plug Grip
MIXTURE CONTROLS
The Needle Valve
When set to produce maximum power at full throttle,
this establishes the basic fuel/air mixture strength. The
correct mixture is then maintained by the carburetor's
built-in automatic mixture control system to cover the
engine's requirements at reduced throttle settings.
The Mixture Control Valve
This meters fuel flow at part-throttle and idling speeds to
ensure reliable operation as the throttle is opened and
closed. The Mixture Control Valve is factory set for the
approximate best result. First run the engine as received
and readjust the Mixture Control Screw only if necessary.
Two mixture controls are provided on this Carburetor.
FUEL TANK LOCATION
Attention to
tank height
How to stop the engine
Pull down the throttle lever and trim lever on the
transmitter fully.
6.
7.
5.
Attention :
Do not choke the carburetor air intake when applying
the starter. This could cause an excessive amount of
fuel to be drawn into the cylinder which may initiate a
hydraulic lock and damage the engine.
VERY IMPORTANT!
Before being operated at full power (i.e. at full-throttle
and with the needle-valve closed to its optimum setting)
the engine must be adequately run-in, otherwise there is
a danger of it becoming overheated and damaged.
Connect battery leads to glowplug.
Apply the starter and press the starter switch for 5-6
seconds to prime the engine.
Bring electric starter into contact with spinner-nut or
spinner and depress starter switch for one or two
seconds. Repeat if necessary. When the engine
starts, withdraw the starter immediately.
Check that the needle-valve is closed. (Do not
overtighten.) Now open the needle-valve counter-
clockwise 2.5 to 3 turns to the starting setting.
3.
4. Open the throttle approx. one-quarter.
(This is to avoid unnecessarily
high r.p.m. when the engine starts.)
Turn needle-valve clockwise to close
(for leaner mixture)
Turn needle-valve counter-clockwise
to open (for richer mixture)
Mark Close
Open
Fully closed
position
Fully opened position
Set at this point
1
4
3
4
STARTING
Be sure to use an electric starter to start the engine.
Fill the fuel tank with fuel. When filled, prevent fuel
flowing into the carburetor with a commercially
available fuel stopper, etc. Release the stopper
before starting the engine.
1.
2.
Starting procedure is as follows:
Make sure that plug element glows red, and install
the plug in the cylinder head.
Locate the fuel tank as close to the engine as possible to minimize fuel level pressure variation.
Be sure to use a pressurized fuel system by
connecting the muffler pressure nipple to the
vent-pipe of the fuel tank.
The Fuel line pickup weight should be 10mm away
from the back of the tank.
Position the fuel tank so that approximately 1/3 of the
tank height is above the center line of the needlevalve.
Loosen the locknut and assembly screw.
Set the exhaust outlet at the required position by
rotating the rear part of the silencer.
Re-tighten the assembly screw, followed by the
locknut.
It is recommended to seal the fitting faces of engine
exhaust and silencer with silicone sealant.
Assembly screw
Locknut
Exhaust
pressure nipple
Gasket
Baffle plate
Can be rotated
by 90 degrees.
Plug
(commercially available)
For carburetor
Approx. 10mm
Approx.
1/3
Carburetor Center Line
For Silencer
Approx.
2/3
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.
Needle Valve
Mixture Control Valve
Note:
Make sure that the throttle linkage is set so that the
throttle is fully closed when the throttle lever as well
as trim lever on the transmitter are fully pulled down.
Propeller Locknut
The exhaust outlet of the silencer can be rotated by 90
degrees the following manner:
Secure the silencer to the engine by means of two
retaining screws supplied after the engine is securely
mounted to a test bench or a model.
INSTALLATION OF SILENCER AND ADAPTORS
In case of installing the silencer direct to
the engine
After the engine is securely mounted to a model
or a test bench, secure the silencer to the
engine by means of two retaining screws
(M4x45) supplied.
In case of installing the silencer with the
extension adaptor to the engine
Secure the silencer and the extension adaptor
to the engine by means of two retaining screws
(M4x90) supplied.
In case of installing the silencer with the
90 degree adaptor to the engine
First secure the silencer to the 90 degree adaptor
by means of two retaining screws (M4x20).
Then, secure the assembly to the engine by
means of two retaining screws (M4x45).
E-5020 Silencer
90 Adapter
E-5020 Silencer
Extention Adapter
Note:
Do not use the extension adaptor and the 90
degree adaptor at the same time (simultaneously),
or they may break.
The connection between the fuel tank and the engine.
ID. 2.5mm Length 1000mm
(optional extra)
O.S. SPEED Silicone Fuel Line
RUNNING-IN (“Breaking-in”)
All internal-combustion engines benefit from extra care
when they are run for the first few timesknown as
running-in or breaking-in. This allows the working parts
to mate together under load at operating temperature.
Therefore, it is vitally important to complete the
break-in before allowing the engine to run continuously
at high speed and before finalizing carburetor
adjustments. However, because O.S. engines are
produced with the aid of the finest modern precision
machinery and from the best and most suitable
materials, only a short and simple running-in
procedure is called for and can be carried out with the
engine installed in the model.
The process is as follows.
Install the engine with the propeller intended for your
model. Open the needle-valve to the advised
starting setting and start the engine. If the engine
stops when the glow plug battery is disconnected,
open the needle-valve to the point where the engine
does not stop. Run the engine for one minute with
the throttle fully open, but with the needle-valve
adjusted for rich, slow "four-cycle"operation.
1.

As the needle-valve is closed slowly and gradually, the
engine r.p.m. will increase and a continuous
high-pitched exhaust note, only, will be heard. Close
the needle-valve 10-15 degrees and wait for the
change of r.p.m. After the engine r.p.m. increases turn
the needle-valve another 10-15 degrees 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.
Optimum needle setting (1) Optimum needle setting (2)
Slowly advance the throttle to its fully open position,
then gradually close the needle-valve until the exhaust
note begins to change. (4-cycle to 2-cycle)
Needle-valve adjustment diagram
MIXTURE CONTROL VALVE ADJUSTMENT
With the engine running, close the throttle and allow it
to idle for about five seconds, then open the throttle
fully. If, at this point, the engine is slow to pick up and
produces an excess of exhaust smoke, the mixture is
too rich. Correct this condition by turning the Mixture
Control Screw clockwise 15-30 degrees. If the mixture
is excessively rich, engine rpm will become unstable:
opening the throttle will produce a great deal of smoke
and rpm may drop suddenly or the engine may stop.
This condition may also be initiated by excessively
prolonged idling. If,on the other hand, the mixture is
too lean, this will be indicated by a marked lack of
exhaust smoke and a tendency for the engine to cut
out when the throttle is opened. In this case, turn the
Mixture Control Screw counter-clockwise 90 degrees
to positively enrich the idle mixture, then turn the
screw clockwise gradually until the engine regains full
power cleanly when the throttle is reopened. Carry out
adjustments patiently until the engine responds quickly
and positively to the throttle control.
Mixture Control Valve adjustments should be
made in steps of 15-30˚ initially, carefully
checking the effect, on throttle response, of
each small adjustment.
REALIGNMENT OF MIXTURE CONTROL VALVE
CARE AND MAINTENANCE
Please pay attention to the matters described
below to ensure that your engine serves you well
in regard to performance, reliability and long life.
As previously mentioned, it is vitally important to
avoid operating the engine in conditions where dust,
disturbed by the propeller, may be deposited on the
engine and enter its working parts.
Remember to keep your fuel container closed to
prevent foreign matter from contaminating the fuel.
Install a fuel filter to prevent dirt and dust in the fuel
container from entering the fuel tank. O.S. Super
Filters (L) and (S) are available as optional extras.
Install an in-line fuel filter between the tank and
carburetor to prevent dirt and dust in the tank from
entering the carburetor.
If these precautions are neglected, restriction of fuel flow
may cause the engine to cut out, or the fuel/air mixture
to become too lean causing the engine to overheat.
Clean these filters periodically.
The use of modern high-performance alcohol based
model engine fuels, while promoting cooler running,
improved anti-detonation combustion and increased
power, have the disadvantage of causing corrosion
due to the acid by-products of combustion. The use
of nitromethane in the fuel can also contribute to the
problem.
Do not close the needlevalve and mixture control
valve 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 of the
engine. Always adjust the needlevalve slightly on the
rich side of peak rpm.
Do not leave unused 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.
Note:
20-45
degrees
This diagram is for reference
purposes only.
Actual needle positions may
differ from those shown.
Note :
Practical best(optimum) needle-valve setting
Exhaust note starts to change.
Disconnect battery
leads from glowplug at
about this point.
Clear, high-pitched two-stroke
exhaust note Maximum rpm
setting("Lean").
STARTING
"Rich" needle-valve
setting when starting
the engine.
The engine may stop if
the battery leads are
disconnected from the
glowplug while the
engine is running rich.
E
n
g
i
n
e
s
t
o
p
s
R
e
v
o
l
u
t
i
o
n
s
s
t
a
r
t
t
o
d
e
c
r
e
a
s
e
.
i
i
i
i
i
i
i
i
i
i
i
Intermittent, high-pitched
two-stroke note
superimposed
on low "four-stroke"
sound.
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.
1
2
3
4
5
6
7
SUBSEQUENT STARTING PROCEDURE
Once the optimum needle-valve setting has been
established the procedure for starting may be
simplified as follows.
Open the needle-valve one half-turn (180 degrees)
from the optimum setting.
Set the throttle one-quarter open from the fully
closed position, energize the glowplug and apply the
electric starter. When the engine starts, re-open the
throttle and re-adjust the needle-valve to the
optimum setting.
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.
Note:
1.
2.
SUBSEQUENT READJUSTMENT
Once the engine has been run-in and the controls
properly set up, it should be unnecessary to alter the
mixture settings; except to make minor adjustments to
the Needle-Valve occasionally, to take account of
variations in climatic conditions. The use of a different
fuel, however, particularly one containing more, or
less, nitromethane and/or a different type or proportion
of lubricating oil, is likely to call for some readjustment
of the Needle-Valve. Remember that, as a safety
measure, it is advisable to increase the Needle-Valve
opening by an extra half-turn counter-clockwise, prior
to establishing a new setting. The same applies if the
silencer type is changed. A different silencer may alter
the exhaust pressure applied to the fuel feed and call
for a revised Needle-Valve setting. The use of a
different glowplug may also require compensating
carburetor readjustments.
In the course of making carburetor adjustments, it is
just possible that the Mixture Control Valve may be
inadvertently screwed in or out too far and thereby
moved beyond its effective adjustment range. Its basic
setting can be re-established as follows:
Close the throttle rotor gradually from the fully opened
position until it is just fully closed. (Do not turn further.)
Then, screw in the Mixture Control Screw until it stops.
Now unscrew the Mixture Control Screw approx. 3/4
turn. This is the basic position.
During subsequent flights, the needle-valve can be
gradually closed to give more power. However, if
the engine shows signs of running too lean, the next
flight should be set richer. After a total of ten flights,
the engine should run continuously, on its optimum
needle-valve setting, without loss of power as it
warms up.
4.
Now close the needle-valve until the engine speeds
up to "two-cycle"operation and allow it to run for
about 10 seconds, then reopen the needle-valve to
bring the engine back to "four-cycle"operation and
run it for another 10 seconds. Repeat this procedure
until the fuel tank is empty.
2.
Re-start and adjust the needle-valve so that the
engine just breaks into "two-cycle" from "four-cycle"
operation, then make three or four flights, avoiding
successive "nose-up" flights.
3.
After the completion of the running-in adjust the
carburetor at optimum setting referring to MIXTURE
CONTROL VALVE ADJUSTMENT section and
SUBSEQUENT READJUSTMENT section.
5.
IDLING ADJUSTMENT CHART
Set the idle speed
Disconnect the battery leads at mid speed.
Start the engine.
Make sure that the throttle is
fully open.
Adjust the neede-valve.
Close the throttle gradually.
Open the throttle fully.
Does the engine
regain full power?
Continue running at high speed
for 10 seconds.
Close the throttle.
Run at idling speed for 5 seconds.
Does the engine stop?
Apply full throttle.
OK
Refer to the next section.
Re-set the idle speed
at a little higher r.p.m.
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.
The position where the lowest possible
r.p.m. ,with steady running, is obtained.
20-45˚ open from maximum r.p.m. setting.
Yes.
No.
Yes.
Engine
stops.
Engine
stops.
Engine
stops.
Does the engine regain
full power immediately?
When the engine is not to be used for some months
(for example, as between flying seasons), a
worthwhile precaution is to remove it from the
airframe and, after washing off the exterior with
alcohol (not gasoline nor kerosene), remove
carefully the carburetor, glow plug and all silicone
tubing and put them safely aside.

Copyright 2013 by O.S. Engine Mfg. Co., Ltd. All rights reserved. Printed in JAPAN.
C011501
http://www.os-engines.co.jp
Then, immerse the engine in a container of alcohol.
Rotate the crankshaft while the engine is immersed.
If foreign matter is visible in the alcohol, rinse the
engine again in clean alcohol. Finally, shake off
and dry the alcohol ,and inject some after-run oil in
the glowplug hole and rotate the crankshaft several
times by hand.
Reinstall the carburetor and glowplug on the engine
and keep it in a dry place after putting in a vinyl bag.
(71904200)
(71531000)
(71531010)
No.8 (71608001)
No.10 (Fomer A5) (71605100)
O.S.GLOW PLUG
O.S. GENUINE PARTS & ACCESSORIES
RADIAL MOTOR MOUNT
NON-BUBBLE WEIGHT
NON-BUBBLE WEIGHT (S)
(72403050)
M5
SUPER FILTER
LOCK WASHER (10sets)
(L)
(71521000)
The specifications are subject to alteration for improvement without notice.
LONG SOCKET WRENCH WITH PLUG GRIP
ENGINE EXPLODED VIEW & PARTS LIST
Type of screw
C...Cap Screw
CARBURETOR EXPLODED VIEW & PARTS LIST
Dimensions(mm)
THREE VIEW DRAWING
6-15 3-Chome Imagawa Higashisumiyoshi-ku
Osaka 546-0003, Japan
TEL. [phone]
FAX. [phone]
(79870040)
M4
(10pcs./sets)
BLIND NUTS
M4 (55500003) (55500004)
(79870050)
No.7 (71607100)
M5
No. Code No. Description
Type of screw
N...Round Head Screw S...Set Screw
No. Code No. Description
79871110
79871150
M3x8
M3x15
CAP SCREW SETS (10pcs./sets)
Code No. Size Pcs. used in an engine
Cylinder Head Retaining Screw (5pcs.)
Cover Plate Retaining Screw (4pcs.)
(45910200) (45910300)
5/16"-M5
PROPELLER LOCKNUT SET FOR SPINNER
5/16"-M4
(72506100)
O.S. SPEED SILICONE FUEL LINE
(71520100)
O.S. SPEED PLUG WRENCH
1
2
3
4
5
6
7
8
9
10
10-1
11
12
13
14
15
16
17
29124000
29123100
29123400
29123200
29206000
28117000
29125000
29182000
45910100
29128000
29008219
46120000
26731010
29121000
46030008
29122000
29121400
29127000
71608001
72200080
29122500
29122540
29122530
22681957
29122520
29122600
29122610
29122700
29122510
Cylinder Head
Cylinder Liner
Piston Ring
Piston
Piston Pin
Piston Pin Retainer (2pcs.)
Connecting Rod
Carburetor Complete (Type 70D)
Locknut Set
Drive Hub
Woodruff Key
Thrust Washer
Crankshaft Ball Bearing (F)
Crankcase
Crankshaft Ball Bearing (R)
Crankshaft
Gasket Set
Cover Plate
Glow Plug No.8
Needle Valve Extension Cable Set
E-5020 Silencer Assembly
Gasket
Assembly Screw
Pressure Nipple (No.7)
Silencer Retaining Screw (C.M4x45 2pcs.)
E-5020 Silencer Extension Adapter
Extention Adapter Retaining Screw (M4x90 2pcs.)
E-5020 Silencer 90 Adapter
90 Adapter Retaining Screw (M4x20 2pcs.)
1
2
3
3-1
3-2
4
5
6
7
7-1
7-2
8
8-1
9
10
27881400
29182200
29181620
46066319
22781800
29182100
45581820
22681953
22681980
24981837
26381501
27381940
26711305
29015019
25081700
Throttle Lever Assembly
Carburetor Rotor
Mixture Control Valve Assembly
"O" Ring (L) (2pcs.)
"O" Ring (S) (2pcs.)
Carburetor Body
Roter Guide Screw
Fuel Inlet (No.1)
Needle-valve Assembly
"O" Ring (2pcs.)
Set Screw
Needle-valve Holder Assembly
Ratchet Spring
Carburetor Rubber Gasket
Carburetor Retaining Screw
(When 90 adaptor is installed)
(When Extention adaptor is installed)
C.M3x15
C.M3x8
1
2
3
4
7
8
9
11 12
13
10
15 16
17
6
14
5
10-1
45
7
S.M3X3
6
7-1 7-2
8
8-1
9
10
N.+M3.5x6
1
2
3
3-1 3-2
N.+M3x6
30.4
69.8
23.5
45.5
85.7
6.1
39.7
139.9
UNF5/16-24
33.8
45.5
27
45
52.8
46.5
67
42.5
25
58
40.6
38.2
27
144.7
46
2
2
115.7
49.4
144.7
46.2
101.1
4- 5.1
13
48
46.2
2- 4.6
79.5
65.2
35.1
105.4
40
5
105.4
11.3
67.2
43.6
69.8
23.5
45.5
85.7 6.1
39.7
139.9
UNF5/16-24
33.8
45.5
27
46.5
67
42.5
25
58
40.6
38.2
27
4- 5.1
14
13
21
30.4
1.3
1.4
40
48.6
21
15
15
48
2-M4x0.7
図面ビューA
2- 4.2
A
Displacement
Bore
Stroke
Output
Practical R.P.M.
Weight (Engine)
(Silencer)
SPECIFICATIONS
19.96 cc / 1.218 cu.in.
30.4 mm / 1.197 in.
27.5 mm / 1.083 in.
3.1 ps / 3.06 hp / 9.000 r.p.m.
1,800-9,500 r.p.m.
647 g / 22.82 oz.
176 g / 6.21 oz.
219.2 g / 7.73 oz.
245 g / 8.64 oz.