O.S. engine MAX-15LA-S User manual

600928800000
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.
Cylinder head
Venturi
Silicone Tube
Crankshaft
Propeller nut
Propeller washer
Drive Hub
Crankcase
Needle valve
Cover Plate
Fuel outlet
Fuel inlet
Glowplug
BASIC ENGINE PARTS
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 3mm steel screws, such as Allen type, with
locknuts, for bolting the engine to the bearers.
Use 3mm 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
For 15LA-S / Code No.71909310
For 25LA-S / Code No.71908100
ABOUT THE ENGINE
NEEDLE-VALVE EXTENSION
INSTALLATION OF SILENCER
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.
The angled exhaust of the silencer can be rotated to
any desired position in the following manner:
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.
1)
2)
3)
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.
Warning:
Fuel Tank
A fuel tank of approximately 40cc capacity for 15LA-S
and 60cc capacity for 25LA-S is suggested.
BEFORE STARTING
Propellers
Glowplug battery
Fuel
Needle Valve Extension Cable Set (Code No.
72200080) is available from O.S. as an optional part.
It is recommended to seal the fitting faces of
engine exhaust and silencer with silicone sealant.
8x4
9x5
15LA-S
25LA-S
8x4-6
9x6, 10x5
Suggested propeller sizes are given in the table. As the
ideal propeller diameter, pitch and blade area vary
according to the size, weight and type of model, final
propeller selection can be made after practical experiment.
Aerobatic & Sport
Running-in
Make sure that these mounting beams are accurately
aligned and firmly integrated with the airframe,
reinforcing the adjacent structure to absorb vibration.
The "LA-S Series" engines are designed for control line
models. They have broad power characteristics which
are suitable for both trainer models and stunt models.
Aseparate needle-valve is mounted at the rear, where
manual adjustment is safely away from the rotating propeller.
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.
Length
15LA-S
25LA-S
51-52mm
55-56mm
The 15LA-S and 25LA-S 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 (5-10%) of nitromethane for
improved flexibility and power. 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.
The power source for heating the glowplug
may be either a large heavy-duty 1.5volt
dry cell.
1.5 volt heavy-duty
dry battery
MAX-15LA-S / MAX-25LA-S

S
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
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.
Battery Leads
O.S. No.6 (Former A3) glowplug is supplied
with the engine.
Glow Plug
Recommended for easy removal and replacement of the
angled and recessed glowplug, the O.S.Long Socket
Wrench incorporates a special grip.
Heatproof silicone tubing of approx. 5mm o.d.
and 2.5mm i.d. is required for the connection
between the fuel tank and engine.
Silicone Fuel Line
Long Socket Wrench With Plug Grip
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.
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.
12-Volt lead-acid battery
Electric Starter
Manual
Electric
GlowPlug Igniter
Commercialy available handy glowplug
heater in which the glowplug battery and
battery leads are integrated.
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.
STARTING THE ENGINE
Preparations
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.
Installing the propeller
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.
For accurately centering the starter's rubber drive insert,
use an O.S. solid alloy spinner-nut. (Available as an optional
extra part).
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.
Filling the fuel tank
Close
Open
Opening and closing of the needle-valve
Turn needle-valve clockwise to close
(for leaner mixture).
Turn needle-valve counter-clockwise
to open (for richer mixture).
Open the needle-valve 3 turns (for 15LA-S), 1 turns
(for 25LA-S) in the direction of arrow from the closed
position.
2
1
Setting the needle-valve
The position where the needle-valve stops is the fully
closed position. It may be convenient to remember the
position of the mark or set-screw at this time.
Fuel inlet
Fuel Tube
Fuel will flow
from tank to
venturi as
propeller is
turned.
Place your finger
over the venturi
to choke intake.
Turn the propeller two revolutions
while watching the fuel line.
Priming
Hold model securely when starting
Starter
Assistant
Assistant should hold the
model so that it cannot
move forward when the
engine starts.
Be careful not
to be hit by propeller!
Glowplug battery.
Place as far to the
rear as possible.
Heat glowplug
Apply electric starter
Engine starts
In the interests of safety, keep your face and other parts
of the body away from the vicinity of the propeller.
13.
Needle-valve adjustment(1)
Then gradually close the needle-valve until the
exhaust sound changes from an irregular pitch
(four-cycle) to a steady pitch (two-cycle).
Close the needlevalve gradually until the engine sound
is changing from a four-cycle into a two-cycle in pitch.
Disconnect battery leads
Disconnect the battery leads from the
engine with care so that the plug clip
does not touch the rotating pro-peller.
If the engine stops
when battery leads are
disconnected, close the
needle-valve a little
(approx. 45˚) further,
and restart the engine.
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 20-30˚ at a time.)
Turn the needle-valve 20-30˚ 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 20-30˚ 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.
Note:
Control line models tend to receive more abrupt changes
of attitude than R/C models,which results in air bubbles
being drawn from the fuel tank. Pay careful attention to the
plumbing and fuel tank position.
5-8mm
15LA-S
25LA-S
11.5mm
12mm
A
A
PLUMBING AND FUEL TANK POSITION
Measurement A (height from the
bottom surface of the mounting
lug to the center of the spray bar)
Metal control line
fuel tank installation
R/C clunk tank installation
Make sure that the center of the spray
bar and tank are on the same line.
Make sure that there are no kinks or folds in the plumbing.
Do not allow fuel to overflow into silencer when refuelling,
otherwise engine may become flooded and difficult to start.
Re-connect
delivery tube
to engine after
tank is filled.
Fuel pump
Use a fuel can filter
(e.g. O.S. Super Filter).
Do not let dirt or
dust enter fuel can.
Disconnect delivery tube
from the fuel inlet, and
connect it to the tubing
from the fuel pump.
Fuel (model glow-plug
engine fuel)
Turn the engine for 3 to 4
seconds by an electric
starter without connecting
glowplug battery.
Starting battery
Connect battery leads as shown
(polarity is immaterial.)
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 venturi
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.
Warning!
Since a control line engine is started with the
throttle fully opened and reaches full rpm right
after starting, be sure to hold the model securely.

(71607100)
No.7
(71608001)
No.8
(72200080)
(71605300)
No.6 (Former A3)
On starting from cold, with the needle-valve
set at the rich starting position:
Take note of this position of the needle-valve.
This will produce the practical best (i.e. optimum)
rpm setting (lower than maximum rpm).
A light grey exhaust emission may be observed.
Now, re-open needle-valve 20-30˚
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.
Finally:
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.)
Further needle-valve closure:
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.
As the needle-valve is closed and the r.p.m. increases:
a good deal of white smoke is emitted, accompanied by
a relatively low-pitched "four-stroke" exhaust note.
How to stop the engine
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
20 -30 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.
RUNNING-IN ("Breaking-in")
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.
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. 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.
(73101000)
(21125108)
(71531010)
O.S.GLOW PLUG
O.S. GENUINE PARTS & ACCESSORIES
RADIAL MOTOR MOUNT
SILENCER EXTENSION ADAPTORS
SPINNER NUT
1/4"-28
LONG PROPELLER NUT SETS
NON-BUBBLE
WEIGHT (S)
(23024009)
1/4"-28 (L)
(72403050)
(79870031)
M3
M3 (55500002)
SUPER FILTER
LOCK WASHER
(10sets)
(L)
(71521000)
The specifications are subject to alteration for improvement
without notice.
LONG SOCKET WRENCH WITH PLUG GRIP
(6pcs./sets)
FANG NUT
NEEDLE VALVE EXTENSION CABLE SET
NOTE: The above sketch is for reference purposes only.
Actual needle positions may differ from those shown.
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.
for 15LA-S
for 25LA-S
(23024008)
1/4"-28 for 25LA-S
(20824005)
M5
for 25LA-S
for 15LA-S
for 25LA-S
(22325100)
15.
To cut off the fuel supply, pinch the fuel delivery tube
to the venturi.
14. Needle-valve adjustment(Summary)
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").
"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
.
t
o
20-30˚
6
5
4
3
2
7
Intermittent, high-pitched
two-stroke note
superimposed on low
"four-stroke" sound.
1
(71909310)
15LA-S
25LA-S
(71908100)

Copyright 2013 by O.S. Engine Mfg. Co., Ltd. All rights reserved. Printed in CHINA.
C121402
ENGINE EXPLODED VIEW & PARTS LIST
Dimensions(mm)
THREE VIEW DRAWING
http://www.os-engines.co.jp
6-15 3-Chome Imagawa Higashisumiyoshi-ku
Osaka 546-0003, Japan
TEL. [phone]
FAX. [phone]
Type of screw
C...Cap Screw T...Tapping Screw
N...Round Head Screw S...Set Screw
SPECIFICATIONS
The specifications are subject to alteration for improvement
without notice.
Cylinder Head (Silver)
Cylinder & Piston Assembly
Piston Pin
Connecting Rod
Venturi
Nozzle For Remote Needle
Propeller Nut
Propeller Washer
Drive Hub
Thrust Washer
Crankcase (Silver)
Crankshaft
Cover Plate Assembly
Cover Plate
Ratchet Spring
Needle
"O" Ring
Set Screw
Head Gasket
Screw Set
Glow Plug N0.6 (Former A3)
871 Silencer
Pressure Fitting
Assembly Screw
Retaining Screw(N.+M2.6x25 2pcs.)
Cylinder Head (Silver)
Cylinder & Piston Assembly
Piston Pin
Connecting Rod
Venturi
Nozzle For Remote Needle
Propeller Nut
Propeller Washer
Drive Hub
Thrust Washer
Crankcase (Silver)
Crankshaft
Cover Plate Assembly
Cover Plate
Ratchet Spring
Needle
"O" Ring
Set Screw
Head Gasket
Screw Set
Glow Plug No.6 (Former A3)
E-2030 Silencer
Pressure Fitting
Assembly Screw
Retaining Screw(N.+M3x27 2pcs.)
25LA-S
15LA-S
SPECIFICATIONS
MAX-15LA-S / MAX-25LA-S MAX-15LA-S MAX-25LA-S
M3.5
B.M2.6x8
S.M3x3
M.+M2.6x10
1
2
3
14
4
15
5
6
78
9
10
11
12
13
13-1 13-2 13-3
13-4 13-5
N.+M3x12(25LA-S)
1
2
3
4
5
6
7
8
9
10
11
12
13
13-1
13-2
13-3
13-4
13-5
14
15
21754010
21753000
21706000
21205040
21712010
21381970
20810007
21109005
21758000
21620006
21751010
21752000
21757000
21757100
26711305
21781970
24981837
26381501
21714100
21713000
71605300
21225000
22681957
22325300
21225400
1
2
3
4
5
6
7
8
9
10
11
12
13
13-1
13-2
13-3
13-4
13-5
14
15
22554010
22553000
22606009
22405013
22312000
21381980
23210007
24009000
22558000
22020001
22551010
22302000
22557000
22557100
26711305
24081970
24981837
26381501
22564000
22563000
71605300
22325020
22681957
22325310
22625404
Description
Code No.
No. No. Code No. Description
32 (27.5)
30.5 (25.8)
60 (48.5)
74.5 (61)
22 (20)
29 (24.8)
44 (40) 67.5 (56.5)
UNF1/4-28 (M5)
39 (30.8) 14 (14.4)
46.5 (39.5)
36 (33)
4- 3.3
※ ( ) 15LA-S
2.49 cc / 0.152 cu.in.
15.2 mm / 0.598 in.
13.7 mm / 0.539 in.
0.41 ps / 0.40 hp / 17,000r.p.m.
2,500-18,000 r.p.m.
129.5 g / 4.56 oz.
37 g / 1.31 oz.
4.07 cc / 0.249 cu.in.
18.0 mm / 0.709 in.
16.0 mm / 0.630 in.
0.6 ps / 0.59 hp / 15,000r.p.m.
2,000-16,000 r.p.m.
185.5 g / 6.54 oz.
62 g / 2.19 oz.
Displacement
Bore
Stroke
Output
Practical R.P.M.
Weight (Engine)
(Silencer)
Displacement
Bore
Stroke
Output
Practical R.P.M.
Weight (Engine)
(Silencer)