O.S. engine MAX-55HZ-R

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It is of vital importance, before attempting to operate

your engine, to read the general 'SAFETY INSTRUCTIONS

AND WARNINGS' in the following section 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.

SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O.S.ENGINE

The advice which follows is grouped under two

headings according to the degree of damage or

danger which might arise through misuse or neglect.

WARNINGS

NOTES

These cover events which might involve serious

(in extreme circumstances, even fatal) injury.

These cover the many other possibilities, generally less

obvious sources of danger, but which, under certain

circumstances, may also cause damage or injury.

WARNINGS

ENGINE PARTS NAME

Remember that your engine is not a " toy ", but a

highly efficient internal-combustion 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.

NOTES

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.

Never touch, or allow any object to come

into contact with, the rotating parts.

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.

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.

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.

This engine was designed for model helicopters.

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 high-speed engines) may eventually

impair your hearing and such noise is also likely to

cause annoyance to others over a wide area.

Check the linkage to the throttle arm before each flight.

After starting the engine, carry out any needle-valve

readjustments after stopping the rotor by closing the

throttle to the lowest r.p.m.. Stop the engine before

attempting to make other adjustments to the carburetor.

Use an electric starter. The wearing of safety glasses

is also strongly recommended.

Press the rotor head down securely.

Take care that the glow plug clip or battery leads do

not come into contact with rotating parts.

Adjust the throttle linkage so that the engine stops

when the throttle stick and trim lever on the

transmitter are fully retarded. Alternatively, the

engine may be stopped by cutting off the fuel supply.

Never try to stop the engine physically.

Take care that loose clothing (ties, shirt sleeves,

scarves etc.) do not come into contact with the rotor.

Do not carry loose objects (such as pencils, screwdriv-

ers, etc.) in a shirt pocket from where they could fall

through the rotor disc.

For their safety, keep all onlookers (especially small

children) well back (at least 20 feet or 6 metres) when

preparing your model for flight. If you have to carry the

model to the take-off point with the engine running, be

especially cautious. Hold the rotor securely and keep

well clear of spectators.

Warning! lmmediately after a glowplug-ignition

engine has been run and is still warm, conditions

sometimes exist whereby it is just possible for the

engine to restart when turned over WITHOUT the

glowplug battery being reconnected. Remember this

if you wish to avoid the risk of accidents.

Notes on installing cooling fan and clutch

Do not use a tool which locks

piston when installing a cooling-fan

and clutch, or top of the piston may

be damaged. Also, do not insert a

screw driver or the similar into the

exhaust port.

Do not grip the engine mounting beams with a

vise, or the crankcase will be distorted which

will result in engine breaking.

Vise

NOTES WHEN APPLYING AN ELECTRIC STARTER

Because of this initial tightness, a standard

electric starter may have difficulty in rotating the

engine when cold, before it has been adequately

run-in. In this case, use a high-torque type starter.

Do not over-prime. This could cause a 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 from getting into your eyes.

90°

A=B

Linking the throttle servo to the carburetor

Link the throttle servo to the carburetor using

the throttle lever supplied. Throttle control rod

A and B should be equal length. Set the

linkage so that the servo output lever and

throttle lever are parallel when the throttle

stick on the transmitter is at middle position.

Installing hole intervals on the F lever and on

the J lever are different. Decide the lever to

use according to the servo used. Be sure to

cut off another lever to avoid any interference.

INTRODUCTION

600929400000

Beam Mount

It is recommended to use

Crankshaft Clamp 3246(Code

No.71530400) available as an

optional tool.

Glowplug No.8

Note on heating the glow plug

Example

The heatsink head on the engine is treated with

an anodized finish which does not conduct

current. Therefore, when heating a glow plug,

connect one lead to the glow plug and the other

to the head or cover plate retaining screw.

With this engine, the cover plate cannot be

removed when the piston is at BDC due to

engine construction.

When it is required to remove the cover plate,

be sure to position the piston at TDC.

Standard accessories

Check Valve

As delivered, the engine has the carburetor

lightly fit into the intake. Secure it changing

the angle according to the model.

NOTE

Avoid sudden high r.p.m. immediately after the

engine is started, as the clutch will engage and you

may be struck by the rotor.

Heatsink Head

Carburetor

Typr 40L-R

Crankshaft

Propeller nut

Crankcase

Glowplug

Beam Mount

Reguretor

High Speed

Needle Valve

Fuel Inlet

Mixture Control Valve

Throttle Lever

Idle Mixture Control Screw

Mixture Control

Valve Stopper

Thrust Washer

Carburetor Rubber Gasket

Medium Speed

Needle Valve

Cover Plate

MAX-55HZ-R

The MAX-55HZ-R has been developed based on

the 55HZ designed expressly for 50 size helicopter

models, and equipped with the new O.S. regulator

system. The regulator system ensures an always

steady fuel supply which is required for 3D flights

which require repeated vigorous attitude changes

as well as mixture control. With this system, the

fuel tank is pressurized by pressure generated in

the crankcase. The fuel sent by pressure is

regulated by the regulator installed just ahead of

the carburetor, then sent into the engine. The

40L-R carburetor is equipped with twin needles

which enable adjustment of the idling/hovering

and high speed mixture independently. When the

governor function from Futaba GY-701 or GY-750

gyro is employed, the Futaba BPS-1 Back Plate

Sensor can be installed in a cell on the back plate.

By employing the governor function, more stable

flight can be achieved.

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Summary

General Safety Instructions and Warnings

Serious Injury Warnings

Covers events that might involve serious or fatal injury through misuse or neglect.

General Danger Notes

Covers general possibilities of danger or injury, often less obvious.

Fuel Handling and Storage

Warns about fuel toxicity, flammability, and safe storage away from children and ignition sources.

Heat and Burn Hazards

Advises caution regarding engine heat and burn risks, especially from the muffler or cylinder head.

Carbon Monoxide Risk

Warns against operating the engine in enclosed spaces due to deadly carbon monoxide exhaust.

Intended Use and Mounting

Specifies the engine is for model helicopters and must be mounted securely.

Silencer and Hearing Protection

Recommends installing an effective silencer to prevent hearing impairment and annoyance.

Pre-Flight Throttle Linkage Check

Advises checking the throttle linkage before each flight for safe operation.

Introduction to MAX-55 HZ-R Engine

Engine Features and Systems

Details the engine's development, regulator system, and carburetor features for stable flight.

Engine Parts Identification

Identifies key engine components with a diagram and labels.

Initial Setup and Connections

Linking Throttle Servo to Carburetor

Guides on connecting the throttle servo to the carburetor linkage for proper control.

Heating the Glow Plug

Explains the procedure for heating the glow plug by connecting to the engine's heatsink head.

Starting and Operating Procedures

Items Necessary for Starting

Lists essential tools, fuel, and accessories required before attempting to start the engine.

Installing Standard Accessories

Provides instructions for installing the glow plug and other standard accessories.

Engine Installation

Details proper engine mounting procedures to ensure alignment and prevent stress.

Carburetor Installation

Guides on securely fitting the carburetor into the engine's intake boss.

Starting Procedure

Outlines the step-by-step process for safely starting the engine using an electric starter.

Stopping the Engine

Explains methods to stop the engine, including using the throttle trim or pinching the fuel line.

Fuel System and Carburetor Controls

Fuel Selection and Filtering

Advises on selecting quality fuel and using filters to prevent foreign matter contamination.

Reguretor (Regulator) Care

Provides crucial care instructions for the pressure regulator, warning against disassembly.

Silencer and Plumbing

Suggests using the O.S. Power Boost 55 II silencer and guides on plumbing connections.

Carburetor Controls Explained

Details the High-Speed (Main) Needle Valve, Idle Mixture Control Screw, and Medium Speed Needle Valve.

Carburetor Body Graduations

Explains the use of graduation marks on the carburetor for throttle opening reference.

Engine Running-In and Adjustment

Running-In Procedure

Explains the short, simple running-in procedure required for O.S. engines in the model.

Needle Valve and Mixture Adjustments

Provides step-by-step guidance for adjusting the High-Speed, Medium-Speed, and Idle Mixture controls.

Subsequent Readjustments

Advises on when and how to readjust carburetor settings due to environmental or component changes.

Carburetor Cleanliness

Emphasizes keeping carburetor orifices clear of foreign matter for reliable engine performance.

Care and Maintenance

Preventing Foreign Matter Ingress

Details precautions to prevent dust and foreign matter from entering the engine's working parts.

Fuel System Maintenance

Recommends keeping fuel containers closed and using filters to maintain fuel purity.

Corrosion Prevention

Warns about fuel by-products causing corrosion and advises adjusting needle valves slightly rich.

Post-Flight Fuel Expulsion

Advises expelling residual fuel and injecting after-run oil after each day's flying.

Long-Term Storage Preparation

Provides detailed steps for preparing the engine for long-term storage to prevent damage.

Genuine Parts and Accessories

Recommended Glow Plugs

Lists O.S. genuine glow plugs available as accessories for the engine.

Other Genuine Accessories

Lists other O.S. genuine parts and accessories like pipes, gaskets, and tools.