O.S. engine FSA-81 User Manual

It is of vital importance, before attempting to operate
your engine, to read the general 'SAFETY
INSTRUCTIONS AND WARNINGS' section on pages
2-6 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
2-6
7
8
9
10-13
20
21
27-28
34-35
36-37
38
17-18
SAFETY INSTRUCTIONS AND WARNINGS
ABOUT YOUR O.S. ENGINE
NOTES WHEN APPLYING AN ELECTTRIC STARTER
ABOUT THE ENGINE
ENGINE PARTS NAME
BEFORE STARTING
INSTALLATION
INSTALLING SILENCER
FUEL TANK & LINES
PROPELLER
GLOWPLUG
CONTENTS
MIXTURE CONTROLS
STARTING
RUNNING -IN ("Breaking-in")
IDLE MIXTURE ADJUSTMENT
CARE AND MAINTENANCE
ENGINE EXPLODED VIEW & PARTS LIST
CARBURETOR EXPLODED VIEWS
& PARTS LIST
GENUINE PARTS & ACCESSORIES
THREE VIEW DRAWING
MEMO
29-30
31-33
39
40
14-16
19
22-23
24-26

O.S. engine FSA-81 Specifications

General

Type	4-stroke
Cooling	Air-cooled
Fuel Type	Glow fuel
Displacement	0.81 cu in (13.3 cc)
Practical RPM	2, 000 - 11, 000 RPM
Glow Plug	OS Type F

Summary

General Safety Instructions and Warnings

Critical Safety Warnings

Covers events that might involve serious or fatal injury.

General Safety Notes

Covers less obvious sources of danger, potentially causing damage or injury.

Electric Starter Safety Precautions

Specific safety advice when using an electric starter.

Engine Overview and Components

Included Standard Accessories

Lists included accessories with the engine.

Engine Component Identification

Identifies the various components of the engine.

Pre-Operation Checks and Setup

Propeller Selection and Installation

Guidance on selecting and installing propellers.

Spinner Usage Recommendations

Recommendations for using a spinner assembly.

Fuel Type and Considerations

Information on recommended fuel types and considerations.

Fuel System Components and Tools

Fuel Tank, Lines, and Filtration

Details on fuel tank, lines, and necessary filters.

Required Tools for Operation

Lists essential tools for engine operation and maintenance.

Engine Mounting and Installation

Mounting Beam Alignment

Ensures correct engine mounting alignment for vibration absorption.

Securing the Engine Mount

Details on securing the engine to mounting beams and bearers.

Throttle Linkage and Silencer Setup

Throttle Linkage Adjustment

Proper connection and alignment of the throttle linkage.

Needle Valve Extension Installation

Information on installing a needle-valve extension.

Silencer Attachment Procedure

Steps for correctly attaching the silencer to the engine.

Fuel Tank and Line Installation

Fuel Tank and Line Placement

Placement and plumbing of the fuel tank and lines.

Propeller and Glow Plug Handling

Propeller Installation and Security

Guidance on propeller installation and tightening.

Glow Plug Selection and Function

Information on glow plug compatibility, function, and replacement.

Carburetor Mixture Controls

Carburetor Control Relocation

Instructions for reversing carburetor control positions.

60RA Carburetor Mixture Controls

Explanation of the two mixture controls on the carburetor.

Starting the Engine

Electric Starter Starting Procedure

Step-by-step guide for starting the engine using an electric starter.

Engine Running-in (Break-in)

Break-in Procedure Steps

Recommended procedure for initial engine operation.

Idle Mixture Tuning

Adjusting Idle Mixture

How to fine-tune the idle mixture for optimal response.

Carburetor and Valve Maintenance

Carburetor Cleaning and Care

Tips for cleaning and maintaining the carburetor.

Valve Clearance Adjustment

Information on valve clearance adjustment and available kits.

Engine Maintenance and Storage

Fuel Contamination and Corrosion Prevention

Advice on fuel handling, filters, and preventing corrosion.

Long-Term Engine Storage

Procedures for long-term storage and engine preservation.

Exploded View and Parts List

Engine Parts Identification

Detailed breakdown of engine parts with code numbers.

Carburetor Assembly and Parts

Carburetor Exploded View Diagram

Diagram showing the assembly of the carburetor.

Carburetor Parts Identification

List of individual parts for the carburetor.

Accessories and Technical Specifications

Genuine Parts and Accessories List

Listing of optional genuine parts and accessories.

Engine Dimensions and Specifications

Technical drawings and performance specifications of the engine.

User Memo Section

Notes and Remarks

Blank space for user notes and remarks.