O.S. engine Max-50SX-H Ring 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 model, radio control equipment, etc.,
are accessible for checking at the same time.
●
●

O.S. engine Max-50SX-H Ring Specifications

General

Type	2-stroke
Displacement	8.17 cc (0.50 cu in)
Bore	22.5 mm
Practical RPM	2, 000 - 16, 000 RPM
Recommended Propeller Sizes	11x7
Glow Plug	O.S. No.8

Summary

Safety Instructions and Warnings

Warnings

Covers events that may lead to serious or fatal injury from misuse or neglect.

Notes

Covers less obvious dangers that could cause damage or injury under certain circumstances.

Introduction

Basic Engine Parts and Installation

Installing the Glowplug

Instructions for correctly installing the glowplug into the cylinder head.

Engine Mounting

Ensuring engine mounts are aligned to prevent stress and internal damage.

Carburetor Installation

Before Starting

Tools and Accessories

Lists essential tools and accessories required for operating the engine.

Facts About Glowplugs

The Role of the Glowplug

Explains how the glowplug initiates ignition and maintains engine running.

Glowplug Life

Factors affecting glowplug longevity and when replacement is necessary.

Fuel Selection and Use

Carburetor Controls

Needle Valve Adjustment

Sets the basic fuel/air mixture for maximum power at full throttle.

Mixture Control Valve Operation

Adjusts mixture for steady idling and smooth acceleration at part-throttle.

Engine Starting Procedures

Needle Valve Setting for Starting

Instructions for opening and closing the needle valve before starting.

Starter Preparation

Steps to prepare the starter, including shaft installation and direction check.

Engine Priming and Starting

Engine Starting and Stopping

Running-In Procedure

Engine Adjustment Basics

Throttle Linkage and Initial Tuning

Hovering and Full Throttle Tuning

Mid-Range Throttle Tuning

Subsequent Readjustments

Carburetor Cleanliness

Adjusting Chart

Throttle Servo Installation

Care and Maintenance

Fuel System Maintenance

Ensuring fuel flow clarity by cleaning filters and carburetor to prevent performance issues.

Post-Operation Engine Care

Procedures for draining fuel, burning off residue, and applying after-run oil for storage.

Engine Exploded View

Engine Parts List

Carburetor Parts List & Exploded View

Three View Drawing

O.S. Genuine Parts & Accessories