O.S. engine FS-120S-E User Manual

It is of vital importance, before attempting to
operate your engine, to read the general
'SAFETY INSTRUCTIONS AND WARNINGS'
section on pages 2-4 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 aircraft, radio control equipment, etc.,
are accessible for checking at the same time.
1

14-15
SAFETY INSTRUCTIONS AND
WARNINGS ABOUT YOUR O.S. ENGINE
INTRODUCTION, INSTALLING THE GLOWPLUG
BASIC ENGINE PARTS
RELOCATION OF CARBURETTOR CONTROLS
CHOKE VALVE
FUEL TANK, INSTALLATION
EXHAUST HEADER PIPE AND SILENCER,
THROTTLE LINKAGE,
NEEDLE-VALVE EXTENSION
PROPELLERS,
PROPELLER AND SPINNER ATTACHMENT
FUEL
GLOWPLUGS
CARBURETOR
CONTENTS
RUNNING-IN
IDLE MIXTURE ADJUSTMENT
VALVE ADJUSTING
CARE AND MAINTENANCE
O.S. GENUINE PARTS & ACCESSORIES
ENGINE EXPLODED VIEWS &
ENGINE PARTS LISTS
CARBURETTOR EXPLODED VIEWS &
PARTS LIST
ENGINE THREE VIEW DRAWINGS
NOTE
STARTING
12-13
2-4
5
6
7
8
9-10
10
11
12
24
15
16-17
18
19
20-21
22
23

O.S. engine FS-120S-E Specifications

General

Brand	O.S. engine
Model	FS-120S-E
Category	Engine
Language	English

Summary

Safety Instructions and Warnings

General Safety Warnings

Covers serious injury risks from rotating propellers, fuel, and heat.

Engine Introduction and Components

Engine Installation and Controls

Engine Mounting Installation

Specifies requirements for secure engine mounting using beams or mounts.

Engine Peripherals and Attachments

Propeller Selection and Attachment

Guidance on choosing propellers and securely attaching them to the engine.

Fuel and Ignition System

Fuel Recommendations and Handling

Glow Plug Usage and Replacement

Carburetor Adjustment and Starting

Carburetor Controls and Adjustments

Explains the three adjustable controls on the carburetor.

Engine Starting Procedure

A detailed, step-by-step guide for safely starting the engine.

Engine Running-In and Tuning

Running-In (Breaking-in) Process

Recommended procedure for breaking in the engine for peak performance.

Idle Mixture Adjustment

How to set the correct idle mixture for smooth throttle response.