O.S. Engines R2101 User Manual
O.S. SPEED R2101
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
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 or abused. 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.
NOTES
These cover the many other possibilities, generally less
obvious sources of danger, but which, under certain
circumstances, may also cause damage or injury.
With this engine, the piston will feel tight at the
top of its stroke (TDC) when the engine is cold.
This is normal. The cylinder bore has a slight
taper. The piston and cylinder are designed to
achieve a perfect running clearance when they
reach operating temperature.
When the engine is cold.
NOTES WHEN APPLYING AN ELECTRIC STARTER
ENGINE CONSTRUCTION
Near TDC
Cylinder
Liner
Crankshaft
Slight taper
Do not over-prime. This could cause a
hydraulic lock and damage the engine on
application of the electric starter.
If over-primed, remove glowplug, close
needle-valve and apply starter to pump out
surplus fuel. Cover the head with a rag to
prevent any pumped out fuel from getting into
your eyes.
Piston
When the engine is hot.
WARNINGS
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 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.
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.
NOTES
This engine is intended for model cars. Do not
attempt to use it for any other purpose.
Mount the engine in your model securely, following
the manufacturers' recommendations, using
appropriate screws and locknuts.
NOTES ON OPERATION
ABOUT THE WARRANTY
Since this is a special SPEED version, individual
special parts are available only for limited period
(one year after finishing the production).
Also, the engine is free of warranty due to damage
and/or wear occurred during running.
While Operating
Please do not run on a public street, this could
cause serious accidents, personal injuries
and/or propetry damage.
Please do not run near pedestrians or small
children.
Please do not run in small or confined areas.
Please do not run where loud noises can disturb
others, such as hospitals and residential areas.
NOTE
As delivered, the engine has the carburetor
lightly fit into its intake. Secure it changing its
angle according to the car chassis.
ABOUT THE ENGINE
The O.S. SPEED R2101 is a high performance
engine designed expressly for 1/8 On-Road Racing.
The major parts have been refined to have a powerful
potential equal to more expensive specially tuned or
modified engines.
Standard accessories
Glow Plug RP7
T-type head (Turbo head) 1piece
Exhaust Seal Ring 1piece
O.S. SPEED Flywheel Collet 1piece
O.S. SPEED Dust Cap Set For 12-30 Class
3mm,16mm,18mm 1piece each
Install an effective silencer (muffler). Frequent close
exposure to a noisy exhaust (especially in the case
of the more powerful highspeed engines) may
eventually impair your hearing and such noise is
also likely to cause annoyance to others over a wide
area.
The wearing of safety glasses is also strongly
recommended.
Take care that the glowplug clip or battery leads do
not come into contact with rotating parts. Also check
that the linkage to the throttle arm is secure.
For their safety, keep all onlookers (especially small
children) well back (at least 20 feet or 6 meters)
when preparing your model for running.
Before starting the engine, always check the
tightness of all the screws and nuts especially those
of joint and movable parts such as throttle arm.
Missing retightening the loose screws and nuts
often causes the parts breakage that is capable of
harming you.
To stop the engine, fully retard the throttle stick and
trim lever on the trans-mitter, or, in an emergency,
cut off the fuel supply by pinching the fuel delivery
line from the tank.
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 it is rotated over compression WITHOUT the
glowplug battery being reconnected.
TOOLS, ACCESSORIES, etc.
The following items are necessary for operating the engine.
Items necessary for starting
FUEL
Generally, it is suggested that the user selects a fuel that is
commercially available for model two-stroke engines When
the brand of fuel is changed, or the nitro content increased, it
is advisable to repeat the running-in procedure referred to in
the RUNNING-IN paragraphs. Please note
that with high-nitro fuels, although power
may be increased for competition purposes,
glowplug elements do not last as long and
engine life will be shortened.
FUEL FILTER
To installed in the fuel line between fuel
tank and carburetor to prevent foreign
matter from entering the carburetor.
GLOWPLUG IGNITER
Commercialy available handy glowplug
heater in which the glowplug battery and
battery leads are integrated.
STARTER BOX
For starting the engine.
FUEL PUMP
For filling the fuel tank, a simple, polyethylene
"squeeze" bottle, with a suitable spout, is
required.
O.S. SPEED SILICONE FUEL LINE
The connection between the fuel tank and the engine.
2.5mm ID
(optional extra)
TOOLS
O.S. SPEED DRIVER TOOLS
O.S. SPEED FLYWHEEL KEY
O.S. SPEED
CLUTCH WRENCH & ADJUSTER
O.S. SPEED FLYWHEEL PULLER
O.S. SPEED PLUG WRENCH
(optional extra)
BASIC ENGINE PARTS
Outer Head
Carburetor
Type 21M2(B)
Crankshaft
Crankshaft Bearing (Front)
INSTALLATION OF THE STANDARD ACCESSORIES
INSTALLATION OF THE TAPER COLLET
Insert the taper collet on the crankshaft, taking care
not to push the crankshaft back so that it contacts the
coverplate face.
Taper Collet
ABOUT THE HEAD GASKET
The engine is installed with a 0.1mm thick and a
0.15mm thick gasket for 25% nitro fuel when it leaves
the factory. Adjust the total thickness according to
atmospheric temperature, humidity and glowplug
used.
CARBURETOR CONTROLS STANDARD POSITIONS
(POSITIONS WHEN THE ENGINE LEAVES THE FACTORY)
Four adjustable controls are provided on this
carburetor.
Carburetor Reducer
Dust Cover
Metering Needle
The Needle-Valve:
For adjusting air/fuel ratio (air-fuel mixture) at maximum
rpm (fully opened throttle).
Close(Clockwise)
Open
(Counter-clockwise)
[Standard Position]
3 turns opened from the fully closed position.
[Fully closed position]
Turn the needle-valve clockwise until it stops.
This is the fully closed position.
Do not force it to turn further.
The Mixture Control Valve:
For adjusting acceleration feeling.
(Adjusting range should be within ±1 turn.)
Needle Valve
[Standard Position]
Flush with the carburetor body.
Mixture Control Valve
Carburetor Body
Crankcase
Ball Link
Mixture Control Valve
Throttle Stop
Screw
Exhaust
Cover Plate
Mounting Lugs
Cover Plate
Needle Valve
The Metering Needle:
For adjusting idle and acceleration feeling.
Ball Link
[Standard Position]
Flush with the ball link body.
Metering Needle
Carburetor Body
The Throttle Stop Screw:
For setting the minimum idle speed:
Carburetor Body
Note:
Sketch shows the carburetor reducer removed.
NOTE: While the Mixture Control Valve and the
Metering Valve are set at the standard position
when the engine leaves the factory, readjustment
may be necessary, occasionally to allow for
changes in fuel formula and climatic conditions
Readjust the controls only when satisfactory
results cannot be obtained with the standard
positions following the instructions mentioned in
the “CARBURETOR ADJUSTMENT” section.
INSTALLATION OF THE CARBURETOR
As delivered, the engine has its carburetor lightly installed
in the intake boss. Secure it as follows.
Retaining
Screw
Loosen the retainer screw, rotate the carburetor to its
1.
correct position and make sure that it is pressed well
down into the intake boss, compressing the rubber
gasket, before retightening screw.
Rotate the retaining screw gently until it stops, then
2.
tighten a further 120-180 , and no more.
Do not overtighten the screw as this will damage the
carburetor body.
Note
Be careful not to damage the O rings when
removing the carburetor retainer from the engine.
First, remove the Retaining screw, then pull out
each retainer. Do not push the retainers in or the O
rings will get damage.
ENGINE INSTALLATION
Make sure that the vehicle's engine mounting surfaces
are level and in the same plane. Poor installation may
cause distortion of the crankcase, bearings, etc.,
resulting in erratic running and loss of performance.
The recommended screws for securing the engine are
3mm or 4-40 steel Allen hexagon socket type. If existing
holes in the engine mount do not align perfectly with
engine mounting lugs, enlarge them slightly with a
needle-file so that screws are in alignment with the
mounting holes.
Chamfer inside edges of bearers.
Slide Valve
Rotate the retainer screw
gently until it stops.
"O" Ring
Do not allow bottom
of crankcase to
touch chassis.
[Standard Position]
Approx 0.5mm
Slide Valve
Tighten a further
120-180
Pull out
"O" Ring
STARTING THE ENGINE & RUNNING-IN ('Breaking-in)
Running- in is a procedure for an engine to come
close to actual running conditions (fuel, r.p.m.,
engine temperature, etc.).
Excessively rich running and prolonged low speed
running should be avoided. Prolonged low speed
running and low temperature running may result
in the oil in the fuel becoming gelled and the
piston/liner becoming stuck together.
PRESSURIZED FUEL SYSTEM
It is recommended that a muffler pressurized fuel
feed system be used so that the fuel may be stably
fed to the carburetor.
The following procedure is suitable when a fuel
containing 25% nitro-methane is used.
Set the carburetor controls at the standard positions
1.
(positions when the engine leaves the factory.)
Switch the transmitter and make sure that each
2.
linkage moves correctly.
Make sure rotating direction of the starter box is
3.
correct (counter-clockwise seen from the front edge
of the crankshaft), and turn the engine with the
starter box to draw fuel into the engine.
Connect glowplug battery lead to heat the plug and
4.
start the engine with the starter box.
When the engine does not start or stops right after
being started, try the followings.
Close the needle-valve
approx. 90° from the
standard position.
Set the throttle opening a
little wider (approx. 1mm)
than the standard setting
by adjusting the Throttle
Stop Screw.
5.
When the engine starts, warm it up by repeatedly
increasing the rpm to medium speed and back
again to a fast idle with the mixture set very rich,
glowplug connected, and the driving wheels clear of
the ground. The rich mixture will provide adequate
lubrication and cooling, indicated by profuse
exhaust smoke.
Attention:
It is vitally important to set the
throttle at the correct position
before starting the engine. If
the engine is allowed to run
with the throttle too far open
under ''no load'' conditions
(i.e. with the driving wheels not in contact with the
ground) it will rapidly over-heat and may be
seriously damaged.
6.
When the engine is warmed up, disconnect the
glowplug battery and try running the car on the
track. If the engine stops soon after running at
around mid speed, the mixture is too rich. Close the
needle-valve 30°.
If the engine still stalls, close the metering needle
30°. Run the car on the track until one tank of fuel
has been consumed, then close the needle-valve
very little (within 10°).
7.
Repeat this procedure (close needle-valve very little
after one tank of fuel has been consumed) until approx.
2 liters of fuel have been consumed, extending gradually
the full throttle running time at the straight. Carefully
observe the exhaust smoke.
Be sure to run the engine with visible white smoke at
all times. If the smoke is not visible, the needle-valve
is closed too far.
Now the RUNNING-IN (Breaking-in) is completed.
Note:
In the event of any major working parts (e.g.
piston/cylinder liner assembly) being replaced or
the fuel being changed, especially to high nitro
fuel, the complete running-in should be repeated.
How to stop the engine
To stop the engine, close the
throttle to idle speed and shut it off
completely with the trim lever on the
transmitter then cut off the fuel
supply by pinching the fuel delivery
tube to the carburetor.
Warning!
Do not touch rotating parts, engine
and silencer when stopping the
engine as they become very hot,
and contact with them may result
in a serious burn.
approx 1mm
Fuel
FINAL ADJUSTMENT
Final adjustment should be carried out only after the
running-in has been completed.
Needle Valve
Open
More fuel
1.
NEEDLE VALVE ADJUSTMENT
Close
Less fuel
Metering Needle
Open
Close
More fuel Less fuel
Run the vehicle (with throttle fully open) over the
longest available straight course a few times to
observe the model’s speed. Return the vehicle to the
starting point and close the Needle-valve 10~15°and
repeat the run, taking note of the improvement in
performance.
Continue with further runs, gradually reduce the
Needle-valve setting aiming to achieve the highest
straight-line speed (optimum position).
Remember, however, if the Needle-valve is closed too
far, the engine will overheat, accompanied by visibly
diminished exhaust smoke and the model will lose
speed. At this point, throttle down immediately, stop
the vehicle and reopen the Needle-valve 30°.
METERING NEEDLE ADJUSTMENT
2.
After setting the Needle-valve at optimum position,
run the vehicle a few times at the straightway, and
stop the vehicle. With the engine still running, close
the throttle and allow it idle for about five seconds,
then reopen the throttle fully.
If, at this point, the engine puffs out an excessive
amount of smoke and the vehicle does not
accelerate smoothly and rapidly or even stops, it is
probable that the idle mixture is too rich. In this
case, turn the Metering needle clockwise 30~45°.
If, on the other hand, the engine tends to speed up
momentarily with little smoke and then cut out
abruptly when the throttle is opened, the idle
mixture is too lean. In this case, turn the Metering
needle counter-clockwise 30~45°.
3.
THROTTLE STOP SCREW ADJUSTMENT
If the engine runs too fast with the throttle closed, the
throttle stop screw should be turned counter-clockwise
to allow the throttle opening to be reduced.
OPTIMUM MIXTURE CONTROL POSITION
With the optimum mixture control position, light smoke
is visible during high speed running and the engine rpm
increase smoothly during acceleration. Carry out
adjustment 1.~3. patiently until the engine responds
quickly and positively to the throttle control.
Remember that, if the engine is operated with the fuel/air
mixture slightly too lean, it will overheat and run
unevenly. As with all engines, it is advisable to set both
the needle-valve and metering needle slightly on the rich
side of the best rpm setting, as a safety measure.
Finally, beyond the normal break-in period, a slight
readjustment toward a leaner needle setting may be
required to maintain maximum performance.
Note:
Please regard the standard positions in the
instruction manual as just a guide. Positions will
vary due to the fuel and silencer used. In general,
if a fuel containing less nitromenthane is used, the
needlevalve will need to be closed further.
Remember, closing the needlevalve too far can
cause rusting and damage to the engine.
CARE AND MAINTENANCE
The minute particles of foreign matter, that are present in
1.
any fuel may, by accumulating and partially obstructing
fuel flow, cause engine performance to become erratic
and unreliable.
O.S. 'Super-Filters' (large and small) are available, as
optional extras, to deal with this problem.
One of these filters installed to the pickup 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
carburetor.
Do not forget to clean the filters regularly to remove
2.
dirt and lint that accumulate on the filter screens.
Also, clean the carburetor itself occasionally.
At the end of each operating session, drain out any fuel
3.
that may remain in the fuel tank. Afterwards,energize
the glow-plug and try to restart the engine, to burn off
any fuel that may remain inside the engine. Repeat this
procedure until the engine fails to fire. Do this while the
engine is still warm.
Then, inject some after-run oil into the engine, and
4.
rotate the engine with an electric starter for 4 to 5
seconds to distribute the oil to all the working parts.
Note:
Do not inject after-run oil into the carburetor as
this may cause the O-rings inside the carburetor to
deteriorate. These procedures will reduce the risks
of starting difficulties or corrosion after a period of
storage.
5.
Finally, when cleaning the exterior of the engine, use
methanol or a household cleaning agent. Do not use
gasoline, kerosene, or any petroleum based
chemical which can damage silicone fuel tubing.
Dirt and dust may lodge in marked places.
REMOVING DIRT/STAIN
Dirt and stain stuck on the engine and silencer/manifold
cause lowering heat dissipation effect. When dirt and
stain are detected, remove the engine from the chassis
and clean it with alcohol.
INATALLING DUST CAPS
When storing the engine, install the cap on the exhaust
port, carburetor, etc. to prevent dust from entering the
engine.
CHECKING THE ENGINE
If the engine will not develop normal performance after
long time running due to wearing of parts. It is suggested
to replace necessary parts when the following symptoms
are detected.
Engine sound changes and easily overheats.
Power has dropped extremely.
Idle is unstable and/or engine tends to stop at idle.
In most cases, ball bearings, cylinder & piston assembly,
connecting rod and/or crankcase have become worn.
Check the parts carefully and replace them if necessary.
O.S. GENUINE PARTS & ACCESSORIES
O.S. GLOW PLUG
(71642060)
RP6
(71642080)
RP8
OUTER HEAD 8S O.S.SPEED R2101
(2A004001)
T-2080SC TUNED SILENCER COMPLETE SET
(72106850)
T-2080SC Tuned Silencer Assembly
(72106851)
Joint Spring (3pcs.)
(72106042)
Exhaust Seal Ring (2pcs.)
(22826140)
M2001SC Exhaust Header Pipe Assembly
(72106870)
Header Pipe Spring (2pcs.)
(72101272)
Exhaust Seal Ring (2pcs.)
(22826140)
SUPER AIR CLEANER 202 ASSEMBLY
On-road Type
PRESSURE CHAMBER SET
(71550000)
(72412000)
202 Cleaner Body
(72412100)
202 Filter Element (4pcs.)
(72412200)
INDUCTION SILENCER
(72414000)
Induction Silencer Filter
(72414100)
ON-ROAD FILTER OIL (20ml)
(72414200)
RP7
(71642070)
(3pcs.)
O.S. SPEED CARBURETOR REPAIR KIT 21
(71490000)
O.S. SPEED Carburetor Repair Parts 21
(71491000)
O.S. SPEED CARBURETOR REPAIR PARTS 21
(71491000)
O.S. SPEED CLUTCH BEARING (1050ZZ 4pcs.)
(71550001)
O.S. SPEED CLUTCH BEARING (1050ZZ 10pcs.)
(71550002)
O.S. SPEED CILICONE TUBE
(72506100)
O.S. SPEED EXHAUST SEAL RING 21
2.5mm x 1000mm
(10pcs.)
(22826145)
O.S. SPEED PISTON PIN RETAINER 4mm
(6pcs.)
(21817010)
O.S. SPEED FLYWHEEL COLETTE
(2pcs.)
(71801110)
O.S. SPEED DUST CAP SET FOR 12-30 CLASS
3mm(2pcs.) / 16mm(2pcs.) / 18mm(1pc.)
(22884254)
DUST CAP SET 3mm
(5pcs.)
(73300305)
DUST CAP SET 16mm
(73301612)
DUST CAP SET 18mm
(73301812)
O.S. SPEED CLUTCH WRENCH & ADJUSTER
(71415300)
(3pcs.)
(3pcs.)
O.S. SPEED FLYWHEEL KEY
(71415200)
O.S. SPEED FLYWHEEL PULLER
(71415100)
O.S. SPEED PLUG WRENCH
(71520100)
O.S. SPEED DRIVER TOOLS
Code No.
71410150
71410200
71410250
71410300
71411200
71411250
71412300
71413550
71413600
71413700
Code No. Description
71414015
71414020
71414025
71414030
71414120
71414125
71414230
71414355
71414360
71414370
The specifications are subject to alteration for improvement
without notice.
O.S. SPEED HEX WRENCH DRIVER 1.5
O.S. SPEED HEX WRENCH DRIVER 2.0
O.S. SPEED HEX WRENCH DRIVER 2.5
O.S. SPEED HEX WRENCH DRIVER 3.0
O.S. SPEED HEX BALL WRENCH DRIVER 2.0
O.S. SPEED HEX BALL WRENCH DRIVER 2.5
O.S. SPEED FLAT HEAD SCREWDRIVER 3.0
O.S. SPEED NUT DRIVER 5.5
O.S. SPEED NUT DRIVER 6.0
O.S. SPEED NUT DRIVER 7.0
O.S. SPEED HEX WRENCH TIP ONLY 1.5
O.S. SPEED HEX WRENCH TIP ONLY 2.0
O.S. SPEED HEX WRENCH TIP ONLY 2.5
O.S. SPEED HEX WRENCH TIP ONLY 3.0
O.S. SPEED HEX BALL WRENCH TIP ONLY 2.0
O.S. SPEED HEX BALL WRENCH TIP ONLY 2.5
O.S. SPEED FLAT HEAD SCREWDRIVER TIP 3.0
O.S. SPEED NUT DRIVER TIP ONLY 5.5
O.S. SPEED NUT DRIVER TIP ONLY 6.0
O.S. SPEED NUT DRIVER TIP ONLY 7.0
Description
ENGINE EXPLODED VIEW
Type of screw
C...Cap Screw
C.M3x18
4-3
4-2
5
C.M2.6x18
6
7
CARBURETOR EXPLODED VIEW
5
5-1
5-1
3
3-1
1-1
1-2
1
THREE VIEW DRAWING
Dimensions (mm)
Specifications
Displacement
■
Bore
■
Stroke
■
■
PracticalR.P.M.
■
Output
■
Weight
3.49 cc (0.213 cu.in.
16.08mm (0.633 in.
17.20mm (0.677 in.
4,000-45,000 r.p.m.
2.8 ps / 2.76 hp / 33,000 r.p.m.
340g (11.99 oz.)
2-1
ENGINE PARTS LIST
Description
(2pcs.)
Flywheel Collet
Dust Cap Set For 12-30 Class
16mm
(2pcs.)/
(2pcs.)
18mm (1pc)
4-4
Code No.
No.
1
2A004000
2
2A004100
3
2A004160
4
1
2
3
4
C.M2.6x7
4-1
4-1
4-2
4-3
4-4
5
6
6-1
7
8
9
10
11
12
2A003010
2A003000
22016000
21817010
23755020
2A081001
23981740
24881824
23731000
2A001000
23730020
2A002000
23107100
2A007000
71642070
12
11
10
22826140
71801110
22884254
Outer Head
Inner Head
Head Gasket Set (0.1mm/0.2mm)
Built-Up Parts Set
Cylinder & Piston Assembly
Piston Pin
O.S. SPEED Piston Pin Retainer 4mm (6pcs.)
Connecting Rod
Carburetor Complete (Type 21M2(B))
Carburetor Retainer Assembly
"O" Ring
Crankshaft Ball Bearing (Front)
Crankcase
Crankshaft Ball Bearing (Rear)
Crankshaft
Cover Gasket
Cover Plate
Glow Plug RP7
Exhaust Seal Ring (2pcs.)
O.S. SPEED
O.S. SPEED
3mm
(2pcs.)/
* marked parts are available only for limited period
(one year after finishing the production).
9
6-1
8
CAP SCREW SETS
Code No.
79871020
79871055
79871180
(
)
10pcs./set
Size Pcs. used in an engine
Cover Plate Retaining Screw (4pcs.)
M2.6x7
Carburetor Retainer Retaining Screw (1pc.)
M2.6x18
Cylinder Head Retaining Screw (4pcs.)
M3x18
The specifications are subject to alteration for improvement without notice.
CARBURETOR PARTS LIST
Code No.
Type of screw
2
4
6
11
C...Cap Screw S...Set Screw
4-1
7
8-1
8
9
10
10-1
S.M3x3
No.
1
1-1
1-2
2
2-1
3
3-1
4
4-1
5
5-1
6
7
8
8-1
9
10
10-1
11
22082600
46066319
22781800
22082970
46066319
22082940
22082950
22848160
27881820
71533085
22615000
22082110
22082200
2A081610
27881820
23981520
23781400
26381501
29015019
Mixture Control Valve Assembly
"O" Ring (L) (2pcs.)
"O" Ring (S) (2pcs.)
Needle Assembly
"O" Ring (2pcs.)
Needle Holder Assembly
No.15 Universal Nipple Assembly
Throttle Stop Screw
"O" Ring (S) (2pcs.)
Carburetor Reducer (8.5mm Red)
"O" Ring (1pc.)
Carburetor Body
Slide Valve
Metering Needle Assembly
"O" Ring (S) (2pcs.)
Dust Cover
Ball Link No.3
Set Screw (1pc.)
Carburetor Rubber Gasket
Description
* marked parts are available only for limited period
(one year after finishing the production).
The specifications are subject to alteration for improvement without notice.
78.6
UNF1/4-28
31.6
45
)
)
)
29.5
44
20.5
21
28
15.6
4- 3.3
37
6-15 3-Chome Imagawa Higashisumiyoshi-ku
Osaka 546-0003, Japan
http://www.os-engines.co.jp
Copyright 2013 by O.S. Engine Mfg. Co., Ltd. All rights reserved.
TEL. (06)6702-0225
FAX. (06)6704-2722
60092970 011402
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