O.S. Engines FS-26S-C II User Manual

It is of vital importance, before attempting to operate your engine, to read the general

'SAFETY INSTRUCTIONS AND WARNINGS'

section on pages 2-5 of this booklet 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.

●

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 vehicle, radio control equipment, etc., are accessible for checking at the same time.

SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S. ENGINE, NOTES WHEN APPLYING AN ELECTRIC STARTER

INTRODUCTION BEFORE STARTING,

BASIC ENGINE PARTS GLOWPLUG,

AIR CLEANER TYPE 102S

INSTALLATION OF THE CARBURETOR & HYPER EXHAUST GASKET, INSTALLATION

STARTING THE ENGINE & RUNNING-IN ('Breaking-in'), VALVE ADJUSTING

CARE & MAINTENANCE, PARTS REPLACEMENT

CONTENTS

TROUBLE SHOOTING

2-6

8-9

10-11

12-13

14-18

ENGINE EXPLODED VIEW & PARTS LIST

CARBURETOR EXPLODED VIEW & PARTS LIST

O.S. GENUINE PARTS & ACCESSORIES

THREE VIEW DRAWING

MEMO

20-23

24-25

27-28

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 applies basically to ALL MODEL ENGINES and 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.

! 

•

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 an 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.

These cover the many other possibilities, generally less obvious sources of danger, but which, under certain circumstances, may also cause damage or injury.

WARNINGS

•

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.

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.

! 

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.

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.

NOTES

•

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.

NOTES

•

Warning! 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 it is rotated over compression WITHOUT the glowplug battery being reconnected.

NOTES WHEN APPL YING AN ELECTRIC STARTER

Do not over-prime. This could cause 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 pumped out fuel coming into your eyes.

INTRODUCTION

The FS-26S-C Ver.II is an overhead valve four stroke cycle engine designed expressly for 1/10 class R/C vehicles. Newly designed 20P carburetor has a bigger bore of 5mm for increased power. For longer life of the engine, Super Air Cleaner 102S is supplied as standard.

Note:

As delivered, the carburetor is not installed on the engine.

STANDARD ACCESSOIES

Glow Plug Type F (included with the engine)

Super Air Cleaner 102S Assembly

Hyper Exhaust Gasket

Insulator

Intake Pipe Assembly

Carburetor Complete (Type 20P)

Carburetor Retainer

BEFORE STARTING

Tools, accessories, etc.The following items are necessary for operating the engine.

FUEL

Generally, it is suggested that the user selects a fuel that is commercially available for model two-stroke engines and contains 10-30% nitromethane. As a starting point, we recommend a fuel containing 20% nitromethane, changing to a fuel containing more nitro if necessary. 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.

REMINDER!

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.

FUEL FILTER

To installed in the fuel line between fuel tank and carburetor to prevent dust coming into 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.

SILICONE FUEL LINE

Heatproof silicone tubing of approx. 5mm o.d. and 2mm i.d. is required for the connection between the fuel tank and engine.

TOOLS

HEX WRENCH

Necessary for engine installation.

1.5mm, 2mm, 2.5mm, 3mm

SCREWDRIVER

Necessary for carburetor adjustments. No.1, No.2, etc

LONG SOCKET WRENCH WITH PLUG GRIP

Recommended for easy removal and replacement of the angled and recessed glowplug, the O.S.Long Socket Wrench incorporates a special grip.

BASIC ENGINE PARTS

Rocker Cover

Glow Plug

Intake Pipe

Carburetor Type 20P

Cover Plate

Cylinder Head

Crankcase

Beam Mount

GLOWPLUG

The FS-26S-C Ver. is supplied with an O.S. Type F glowplug, specially designed for O.S. four-stroke engines.

The role of the glowplug

With a glowplug engine, ignition is initiated by the application of a 1.5-volt power source. When the battery is disconnected, the heat retained within the combustion chamber remains sufficient to keep the plug filament glowing, thereby continuing to keep the engine running. Ignition timing is 'automatic' : under reduced load, allowing higher rpm, the plug becomes hotter and, appropriately, fires the fuel/air charge earlier; conversely, at reduced rpm, the plug become cooler and ignition is retarded.

Glowplug life

Particularly in the case of very high performance engines,

glowplugs must be regarded as expendable 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.

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.

AIR CLEANER TYPE 102S

It has a single filter element and is intended primarily for circuit racing, where conditions are less damaging than the very dusty, loose surf aces of off-road operation for which the double-element Type 101 and 102 Air Cleaners are recommended. The lower height of the Super Air-Cleaner 102S also facilitates easier installation in cars where available space may be restricted.

INSTALLATION OF AIR CLEANER

Carefully clean the carburetor, removing any old adhesive or sealant that may have been previously used on the outside of the air intake.

Press the air cleaner body firmly over the carburetor air intake. Make sure that the outer rim of the air intake engages the internal annular groove in the air cleaner: failure to do so may result in the air cleaner falling off.

Position the air cleaner correctly, so that it does not interfere with the cylinder-head or obstruct the needle-valve.

INSTALLING THE FILTER ELEMENT

The element is already impregnated with a special filter oil. As this oil is very sticky, take care, when handling it, to prevent dust or dirt from adhering to the element. If your fingers become contaminated, wash them with soap and water.

During storage, the oil may have become unevenly dispersed through the element. This will be indicated if the blue colour of the element material appears patchy. In this case, place the element in a small plastic bag and gently rub it between finger and thumb to redistribute the oil.

Insert beneath flange

REPLACEMENT OF ELEMENT

It is advisable to replace the filter element with a new one after not more than one hour of running time. Always remove contaminated elements carefully, to ensure that dirt cannot enter the carburetor.

INSTALLATION OF THE CARBURETOR & HYPER EXHAUST GASKET

Install the insulator and intake manifold on the cylinder head.

Install the carburetor retainer nut on the intake manifold temporarily.

Install the carburetor gasket on the carburetor.

Press the carburetor into the exhaust manifold and fasten the lock nut gradually until it stops.

Fasten the lock nut a further 60-90 degrees. Do not fasten any further or the parts will be distorted and/or damaged.

If you wish to change the fuel inlet position, loosen the needle holder and set the inlet at desired position, then fasten the needle holder gradually until it stops and fasten a further 45-60 degrees. Do not fasten any further or the inlet will be distorted, which results in fuel leaking.

Carburetor Retainer

Note: Installation procedure may vary according to the car kit.

Intake Manifold

Fuel Inlet

Needle Holder

Insulator

Lock Nut

Carburetor Gasket

Hyper Exhaust Gasket

Insert Hyper exhaust gasket into the exhaust port.

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 enter vertically. Avoid forcing the screws. Secure with locknuts.

Chassis

⇒

Chamfer inside edges of bearers.

Chassis

STARTING THE ENGINE & RUNNING-IN ('Breaking-in')

When starting the engine, lay the chassis on a stand so that tiers may not be in contact with the ground.

The somewhat violent changes of vehicle attitude that occur in off-road running, combined with the fact that, in buggy type cars, the fuel tank is often located some way from the carburetor, means that fuel ‘head’ at the carburetor can vary and upset running. Therefore, it is recommended that a muffler pressurized fuel feed system be used.

Fuel Tank

Connect suitable length of Silicone tubing between fuel tank and silencer.

Silicone tubing

Silencer

In the interests of a long working life and high performance, every internal-combustion engine need to be “run-in” (or “breaking-in” as the procedure is also known), while the engine is installed in the car and run the car.

Fill the tank completely with fuel.

Fuel Pump

Fuel Tank

Temporarily remove the glowplug to check that it glows bright red when energized.

Element glows when energized.

Pliers

Replace the plug when the element does not glow or is burnt out.

Glow Plug Igniter

NOTE When checking the glowplug while energizing it, do not hold it by fingers but

! 

use pliers. Do not come your face close to the glowplug or get burned with boiled fuel remaining in the coil.

Turn the needle-valve clockwise slowly until it stops. This is the fully closed position. Do not force to turn further.

Open

Needle Valve

Open the Needle-Valve 2 turns from the fully closed position.

Set the throttle-stop screw so that the minimum throttle opening (idle setting) is approximately 2mm.

●

Switch on the transmitter, followed by the



receiver. Close the throttle stick and open the throttle trim lever to the idle setting.

約2.0mm

Prime the carburetor by pressing the fuel tank

Deliver fuel into the carburetor.

primer until fuel reaches the carburetor.

Fuel

Fuel tank side

Now connect glowplug battery lead to heat the plug filament and start the engine.

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 over-heat and may be seriously damaged.

the ground) it will rapidly

When the engine starts, first allow it to operate in short runs at the very rich starting settings, with the glowplug battery still connected and the driving wheels clear of the ground. The rich mixture will, under these conditions, provide adequate lubrication and cooling, indicated by profuse smoke from the exhaust.

Next, disconnect the glowplug battery and

◆

try running the car on the track. If the engine stalls, open the throttle fractionally, but try to keep the engine running as rich as possible: if it stops because of being excessively overrich, close the Needle-Valve 30˚ and try again.

Run the car on the track until one tank of fuel has been consumed, then close the NeedleValve 30˚ and run the car for another full tank of fuel. Repeat this procedure until 1/2 gallon of fuel have been consumed, during which time the throttle may be opened for brief bursts of increased power.

The position of the needle-valve

Needle

The position of the needle-valve where highest speed of the vehicle is obtained.

when starting the engine.

Close the needle-valve approx. 30° after running the vehicle for one full tank of fuel. Repeat this procedure several times.

Optimum needle-valve position (10° to 20° opened from the position where highest speed of the vehicle is obtained.)

Now open the needle-valve 10°-20° from the setting at which the highest straight line speed is obtained. This slightly rich setting should provide the optimum balance. Run the car for about three more tanks of fuel to allow fine-tuning of any final adjustments.

Re-adjust the throttle stop screw, if neccessary, so that the car may not move at idling.

Notes Running-in the engine with excessive rich setting means nothing but damage the engine. Run-in the engine with adequate running temperature so that the heat can be conveyed to all the internal parts.

Note: Adjusting the carburetor with no load condition means nothing but damage the engine. Do not run the engine with no load. In the event of any major working parts (e.g. piston/cylinder liner assembly) being replaced or the fuel changed, especially to high nitro fuel, or silencer and gear ratio and clutch timing changed, the complete running-in should be repeated.

To stop the engine, close the throttle to idling speed, then shut it off completely with the trim lever on the transmitter. To cut off the fuel supply, pinch the fuel delivery tube to the carburetor.

Air Cleaner

Fuel

Gloves

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.

VALVE ADJUSTING

Valve clearances are correctly set before any O.S. engine leaves the factory and, in normal use, will seldom require adjustment. However, if, after a considerable amount of running time, a loss of power is detected, or if he engine has been disassembled for repair, these clearances should be checked and reset as necessary. For checking and adjusting the valve clearances, a VALVE ADJUSTING TOOL KIT is available as an optional accessory.

CARE & MAINTENANCE

At the end of each operating session, drain the fuel tank, then energize the glowplug and try to re-start the engine to burn off any fuel that may remain inside. Repeat this procedure until the engine fails to fire. Then remove the glowplug and drain off any residue while the engine is still warm.

Inject some corrosion-inhibiting after-run oil and rotate the crankshaft to distribute oil to the working parts. Do not inject such oil into the carburettor, however, as it may cause deterioration of the carburettor's O-ring seals.

Apply a little lubricating oil to the rocker shaft and rocker arms.

Note! These maintenance procedures will reduce the risks of corrosion or starting difficulties after a period of storage.

When cleaning the exterior of the engine, use methanol or kerosene. Do not use gasoline or any solvent that might damage the silicone fuel tubing.

PARTS REPLACEMENT

Over a long period, depending on how well your engine has been protected from the ingress of dust and grit and other causes of wear and tear, loss of performance may eventually occur in the form of reduced power, reluctant starting, unstable idling, etc. Having checked that this is not due merely to the need to readjust the valve clearances (for which an O.S. Valve Adjustment Kit - Code No. 72200060 - is available) inspection may then reveal that the replacement of some parts may be called for. Contact the O.S. distributor in your country for parts or full service. See pages 25 & 26 of this booklet for details of parts.

TROUBLE SHOOTING

Symptom

Engine fails to fire.

Cause

Fuel tank is empty. Fuel not reaching the engine.

Glowplug element is burnt out. Glowplug battery discharged

Clogged fuel filter

Air cleaner and silencer inside is dirty. Over priming Remove glowplug and pump excess fuel.

Fill the tank with fuel and repeat Priming procedure.

Replace glowplug. Recharge or replace the battery.

Clean or replace fuel filter.

Replace cleaner element and clean inside silencer.

Corrective action

Fuel tubing is disconnected. Fuel tubing is kinked, split or has a hole.

Incorrect servo linkage

Reverse rotating direction of starter box.

Symptom

Engine fires intermittently but does not run.

Cause

Insufficient fuel in the tank. Fill the tank with fuel.

Deteriorated glowplug Clogged fuel filter

Air cleaner and silencer inside is dirty.

Connect fuel tubing securely. Check the tubing carefully and replace if necessary.

Re-linkage after setting servo at neutral. Mare sure it rotates counter clockwise seen

from crankshaft side.

Replace glowplug.

Clean or replace fuel filter.

Replace cleaner element and clean inside silencer.

Corrective action

Engine overheated

Incorrect clutch release

Too immediately disconnecting plug battery.

Fuel in the tank extremely bubbled

Wait until engine is cooled.

Adjust the tension of clutch spring. Do not disconnect plug battery and wait until

r.p.m. become stable. Fit O rings to the tank screws to

prevent bubbles.

Symptom

Unstable idle

Cause

Corrective action

Unsuitable glowplug

Unsuitable fuel Silencer is disconnected or has play

Symptom

Not reaching expected peak r.p.m.

Cause

Insufficient warming up or running-in. Silencer or manifold is not securely connected

or disconnected. Fuel tubing from tank to is split or broken.

Use suggested glowplug in the instructions.

Do not use extremely high nitro or low oil fuel. Install silencer securely.

Corrective action

Set the needle only after warming up. Complete running-in.

Check the connections and secure them.

Replace the tubing.

Symptom

Poor response

Cause

Deteriorated glowplug Incorrect carburetor settings

Incorrect setting of transmitter Exponential function.

Symptom

Poor r.p.m. drop

Cause

Too much throttle opening at idle.

Incorrect carburetor fitting

Corrective action

Replace glowplug. Readjust low r.p.m. range with needle Valve

and Throttle Stop Screw.

Check the transmitter setting.

Corrective action

Close Throttle Stop Screw to adequate position to lower idle r.p.m.

Fit carburetor securely.

ENGINE EXPLODED VIEW

C.M2.6x12

C.M2.6x8

C.M2.6x7

Type of screw C…Cap Screw M…Oval Fillister-Head Screw

＊

0.2mm

20-1

F…Flat Head Screw N…Round Head Screw S…Set Screw

4-2

4-1

M3.5

C.M3x10

14 15

C.M2.6x18

3-1

3-2

5-4

5-3

5-2

5-1

27-2

27-1 27-2

C.M2.6x7

ENGINE PARTS LIST

No.

Code No.

44113000

43004200

45761400

3-1

45761410

3-2

45761600

45761000

4-1

45761100

4-2

45761200

45760020

5-1

45760110

5-2

45760210

5-3

45060309

5-4

46160400

44104100

44104020

45169100

21381950

45269400

21481700

45282000

22714100

44103400

44103200

22706000

45705000

44103100

45707010

44102010

20-1

45702100

22830000

44101010

45762100

45762010

45701110

44166000

44166100

27-1

44166110

27-2

24881824

45264000

45231000

23210007 71615009 72403202 72403212 72403120

The specifications are subject to alteration for improvement without notice.

Screw Set Rocker Cover Rocker Support Assembly Rocker Support Rocker Arm Retainer (2pcs.) Rocker Arm Assembly (1pair) Rocker Arm (1pc.) Tappet Adjusting Screw Valve Assembly (1pair) Valve (1pc.) Valve Spring (1pc.) Valve Spring Seat (1pc.) Valve Spring Retainer (2pcs.) Cylinder Head (W/Gasket) Cylinder Head Assembly (W/Gasket and Valve Assembly) Hyper Exhaust Gasket (2pcs.) Insulator Intake Pipe Assembly Carburetpr Retainer Carburetor Complete (Type 20P) Cylinder Head Gasket Piston Ring Piston Piston Pin Connecting Rod Cylinder Liner Cover Plate Crankshaft Crankshaft Spacer Crankshaft Ball Bearing (Rear) Crankcase Thrust Ball (2pcs.) Camshaft Cam Cover Push Rod (2pcs.) Push Rod Cover Assembly (2pcs.) Push Rod Cover (1pc.) Push Rod Cover "O" Ring (2pcs.) Cam Follower (2pcs.) Crankshaft Ball Bearing (Front) Propeller Nut Glow Plug Type F Super Air Cleaner 102S (W/3 filter elements) 102S Cleaner Body 101,102 Filter Element (6pcs.)

Description

CARBURETOR EXPLODED VIEW & PARTS LIST

N.+M3x6

6-1

Type of screw

C...Cap Screw M...Oval Fillister-Head Screw F...Flat Head Screw N...Round Head Screw S...Set Screw

6-2

No.

Code No.

22081408

21283210

45282200

22681310

45282100

21285901

27881820

6-1

21881950

6-2

22615000

The specifications are subject to alteration for improvement without notice.

Throttle Lever Assembly Carburetor Dust Cover Carburettor Rotor Throttle Stop Screw Carburettor Body Needle-valve Assembly "O" Ring (2pcs.) Universal Nipple No.14 Assembly Carburettor Rubber Gasket

Description

RACING ENGINE PARTS

GLOWPLUG

Type F

(71615009)

For Kyosho Spider

(44126010)

HYPER EXHAUST SET

For Kyosho Super 10

(44126000)

3-1

2-1

O.S. GENUINE PARTS & ACCESSORIES

2-1

3-1

(44126110)

(45169200)

2-1

(45169210) (44126200)

(45169100)

3-1

(44126300)

(44126400)

(44126100)

(45169200)

2-1

(45169210) (44126200)

(45169100)

3-1

(44126300)

(44126400)

Hyper Exhaust Pipe Exhaust Pipe Lock Nut Exhaust Gasket (2pcs.) Exhaust Adaptor Hyper Exhaust Gasket (2pcs.) Pipe Joint Clamp



RACING ENGINE PARTS

O.S. GENUINE PARTS & ACCESSORIES

SUPER JOINT TUBE 15

(72103310)

VALVE ADJUSTING KIT

(72200060)

F-2000 4C CAR SILENCER

(44125100)

LONG SOCKET WRENCH WITH PLUG GRIP

(71521000)

The specifications are subject to alteration for improvement without notice.

FS-26S-C ENGINE MOUNT

For Kyosho V-oneR, S

(72404400)

For HPI Nitro Series

(72404500)

CAP SCREW SET

(79871020)

M2.6x7

(79871025)

M2.6x8

(79871040)

M2.6x12

(79871055)

M2.6x18

(10pcs. / set)

THREE VIEW DRAWING

SPECIFICATIONS

Displacement

■

Bore

■

Stroke

■

Practical R.P.M.

■

Power output

■

Weight

4.41cc (0.270cu.in.)

18.5mm (0.728in.)

16.4mm (0.646in.) 2,000-22,000 r.p.m.

0.5ps / 17,000 r.p.m.

242.5g (8.56oz.)

70.9

14.5

4- 3.3

UNF1/4-28

14.6 39.8 18

Dimensions (mm)

MEMO

6-15 3-Chome Imagawa Higashisumiyoshi-ku Osaka 546-0003, Japan

URL : http://www.os-engines.co.jp

TEL. (06)6702-0225

FAX. (06)6704-2722

60091670 030500

O.S. Engines FS-26S-C II User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual