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O.S. engine MAX-91HZ User Manual

O.S. engine MAX-91HZ
48 pages
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Table of Contents

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O.S. engine MAX-91HZ Specifications

General IconGeneral
Engine Type2-stroke
Fuel TypeGlow fuel
Practical RPM2, 000 - 16, 000
Displacement14.95 cc
Bore27.7 mm
Stroke24.8mm (0.976 in.)
Glow PlugO.S. #8
FuelMethanol-based glow fuel

Summary

Safety Instructions and Warnings About Your O.S. Engine

General Warnings

Covers events that might involve serious or fatal injury.

Engine Introduction and Accessories

Engine Parts Identification

Before Starting Your Engine

Essential Starting Components

Details on the glow plug, battery leads, and glowplug battery required for starting.

Electric Starter System

Information on using an electric starter and its components for engine ignition.

Fuel Selection and Handling

Engine Mounting and Installation

Standard Accessories Installation

Carburetor Installation Procedure

Needle Control Arm Installation

Carburetor Mixture Controls

High-Speed Needle Valve

Function and adjustment of the main needle valve for full throttle performance.

Idle Mixture Control Screw

How to adjust the idle mixture for stable engine operation at low speeds.

Medium Speed Needle Valve

Purpose and adjustment of the medium speed needle for hovering.

Engine Starting Procedure

Running-In and Breaking-In

Engine Mixture Adjustment

High-Speed Needle Valve Adjustment

How to adjust the high-speed needle for optimal performance.

Detailed Adjustment Procedure

Carburetor Cleanliness and Maintenance

Adjustment Chart for Engine Tuning

Throttle Servo Installation

Engine Care and Maintenance

Engine Troubleshooting Guide

Engine Exploded View

Engine Parts List

Carburetor Exploded View

Carburetor Parts List

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