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.

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Also, please study the entire contents of this
instruction manual, so as to familiarize yourself
with the controls and other features of the
engine.

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Keep these instructions in a safe place so that
you may readily refer to them whenever
necessary.

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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

19

ENGINE EXPLODED VIEW
& PARTS LIST

7

CARBURETOR EXPLODED VIEW
& PARTS LIST

O.S. GENUINE PARTS &
ACCESSORIES

THREE VIEW DRAWING

MEMO

1

20-23

24-25

26

27-28

29

30

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.

2

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

3

!


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.

4

!


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.

5

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.

6

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)

7

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.

8

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

9

Cylinder Head

Crankcase

Beam Mount