O.S. engine Max-50SX-H Ring Owner's Instruction Manual
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O.S. engine Max-50SX-H Ring Owner's Instruction Manual

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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.

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Summary of Contents for O.S. engine Max-50SX-H Ring

  • Page 1 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.

  • Page 2: Table Of Contents

    CONTENTS SAFETY INSTRUCTIONS AND WARNINGS SUBSEQUENT READJUSTMENTS ABOUT YOUR O.S. ENGINE CARBURETTOR CLEANLINESS INTRODUCTION ADJUSTING CHART BASIC ENGINE PARTS, INSTALLATION INSTALLATION OF THROTTLE SERVO CARE AND MAINTENANCE BEFORE STARTING ENGINE EXPLODED VIEW & FACTS ABOUT GLOW PLUGS PARTS LIST FUEL...

  • Page 3: Safety Instructions And Warnings About Your O.s. Engine

    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.
  • Page 4 WARNINGS • • Never touch, or allow any Never operate your engine in an en- object to come into contact closed space. Model engines, like auto- mobile engines, exhaust deadly carbon- with, the rotating parts. monoxide. Run your engine only in an open area.
  • Page 5 NOTES • • These engine were designed for model After starting the engine, carry out any needle- helicopters. Do not attempt to use it for any valve readjustments after stopping the rotor by other purpose. closing the throttle to the lowest r.p.m.. Stop the engine before attempting to make •...
  • Page 6 NOTES • 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 pen- cils, screwdrivers, etc.) in a shirt pocket from where they could fall through the rotor disc. •...

  • Page 7: Introduction

    INTRODUCTION Note: This is a high performance engine Because initial tightness, developed expressly for F3C M class standard electric starter may have difficulty in rotating the engine when helicopter competition utilizing 50 cubic cold, before it has been adequately inch engines. run-in.

  • Page 8: Basic Engine Parts

    Typr 40E Cover Plate INSTALLATION OF THE ENGINE The under-surfaces of all O.S. engine beam mounting lugs are precision machined flat and exactyly parallel to the engine's horizontal axis. It is essential that the engine mounts in the model are also accurately made and aligned.

  • Page 9: Before Starting

    CORRECT INSTALLATION OF THE CARBURETOR As delivered, the engine has its carburetor lightly fitted into its intake boss. Secure it as follows. Loosen the retainer screw, rotate the carburetor to its correct position and press it well down into the Side view Front view intake boss, compressing the rubber gasket as...
  • Page 10 2 Glowplug 4 Plug wrench O.S. No.8 glowplug is installed in the engine. Used for tightening glowplug. The O.S. long plug wrench is available 3 Glowplug battery as an optional accessory. The power source for heating the glowplug may be For tightening glowplug either a large heavy-duty 1.5volt dry cell, or preferably,...

  • Page 11: Facts About Glowplugs

    7 Fuel container filter FACTS ABOUT GLOWPLUGS Fuel Can Filter Install a filter on the outlet tube Since the compatibility of glowplug and fuel may have of your refuelling container to a marked effect on performance and reliability, it may prevent entry of foreign matter be worthwhile to choose the R/C type plug found into the fuel tank...

  • Page 12: Fuel 10

    However, plug life can be extended and engine FUEL performance maintained by careful use, i.e.: Select, by practical tests, the most suitable fuel from • Install a plug suitable for the engine. among the best quality fuels available in your country •...

  • Page 13: Carburetor Controls

    BASIC POSITION OF MIXTURE CONTROL VALVE CARBURETOR CONTROLS (Mixture Control Screw) With a fixed-wing model, power failure is rarely a As delivered, the Mixture Control Screw is positioned serious threat to the safety of the aircraft since it can usually glide down to a safe landing. In a helicopter, at the center as shown in the sketch.

  • Page 14: Starting 13

    Graduations on the carburetor body STARTING Be sure to use a muffler pressurized fuel feed. Use ° Fully opened position the same fuel as you intend to employ for actual operation of your model. Carburetor Body Fully closed position Opening and closing of the Needle-Valve Turn the needle clockwise to Open Carburetor Rotor...
  • Page 15 Checking the rotating direction of the starter Starting Make sure that the starter rotates Connect the battery to the glowplug and start the to the direction shown in the engine by applying the starter. When started, sketch. If the direction is reverse, switch off the starter and withdraw the starting reverse the leads on battery.

  • Page 16: Running-In,Adjustment 15

    NOTE: short and simple running-in procedure is required and If the throttle response is poor or the engine can be carried out with the engine installed in the stops due to a temporarily over-rich mixture im- model. For the first few flights with a new engine i.e.
  • Page 17 This enables the full r.p.m. range, from idling to full lf, at this time, the engine is slow to pick up and power, to be controlled by the throttle stick, and produces an excess of exhaust smoke, the mixture then allows the engine to be stopped, from the is too rich.
  • Page 18 exhaust unduly smoky and the model fails to reach Hover the model and actuate the throttle to expected straight line speed, the mixture is too rich observe response over the medium speed range. and the Needle Valve setting will need to be lf the engine smokes excessiveIy and throttle reduced.

  • Page 19: Subsequent Readjustments

    Readjustments should therefore be carried out as SUBSEQUENT READJUSTMENTS follows: Once the engine has been run-in and the carburetor lf the mid-range throttle response is not rapid and controls properly set up, it should be unnecessary to positive (indicating a rich mid-range mixture), turn alter the mixture settings, except to make minor the Needle Valve 2 or 3 clicks clockwise, or turn the adjustments to the Needle Valve occasionally, to take...

  • Page 20: Carburetor Cleanliness

    CARBURETOR CLEANLINESS Remove this with an 8mm spanner The correct functioning of the carburetor depends on its small fuel orifices remaining clear. The minute particles of foreign matter that are present in any fuel can easily partially obstruct these orifices upset mixture strength...

  • Page 21: Adjusting Chart

    ADJUSTING CHART Open the Needle Valve 2 turns from the fully closed position. Make sure that the Mixture Control Valve is at the factory setting. Start the engine Warm up the engine Observe the mixture condition while "floating" the model Rich mixture Lean mixture Turn the Mixture...

  • Page 22: Installation Of Throttle Servo

    your refueling container, will prevent the entry of INSTALLATION OF THROTTLE SERVO foreign material into the fuel tank. It is also After the engine in the helicopter, please observe the recommended that a good in-line filter be installed following recommendations when linking the throttle between the tank and carburetor.

  • Page 23: Exploded View

    EXPLODED VIEW C.M3X15 C.M3X8 C.M2.6X18 Type of screw … … Cap Screw M Oval Fillister-Head Screw … … … Flat Head Screw N Round Head Screw S Set Screw...

  • Page 24: Engine Parts List

    ENGINE PARTS LIST Description Code No. Heatsink Head 25204000 25203100 Cylinder Liner Piston Ring 25303400 Piston 25203200 Piston Pin 25206000 Piston Pin Retainer 25217000 Connecting Rod 25205000 Carburetor Complete 40E 25281000 Carburetor Sealing Washer 23818190 Propeller Nut 23210007 Drive Washer 27708010 Woodruff Key 27708200...
  • Page 25 CARBURETOER PARTS LIST & EXPLODED VIEW C.M3X8 Description Code No. 27381410 Throttle Lever Assembly 22826131 Throttle Lever Retaining Screw 1 -1 25281200 Carburetor Rotor 25281600 Mixture Control Valve Assembly 3 -1 27881810 "O" Ring (L) (2pcs.) 3 -2 "O" Ring (S) (2pcs.) 27881800 3 -3 27881820...

  • Page 26: Three View Drawing

    THREE VIEW DRAWING Dimensions(mm) 17.5 SPECIFICATIONS 8.17 cc ( 0.499 cu.in. ) Displacement 22.0mm ( 0.866 in. ) Bore 21.5mm ( 0.847 in. ) Stroke 2,000 20,000 r.p.m. Practical R.P.M. 1.8 bhp / 17,000 r.p.m. Power output 413g(14.58oz.) Weight 51.6 UNF1/4-28 24.8...

  • Page 27: O.s. Genuine Parts & Accessories

    O.S. GENUINE PARTS & ACCESSORIES IN-FLIGHT CONTROL NEEDLE VALVE O.S. GLOW PLUGS (71705000) No.8 (71608001) (71605100) LOCK WASHER(10set) LONG SOCKET WRENCH SUPER FILTER WITH PLUG GRIP (71521000) (72403050) (55500002) ( L )
  • Page 28 6-15 3-Chome Imagawa Higashisumiyoshi-ku Osaka 546-0003, Japan TEL. (06) 6702-0225 FAX. (06) 6704-2722 URL : http://www.os-engines.co.jp Copyright 2000 by O.S.Engines Mfg. Co., Ltd. All rights reserved. Printed in Japan. 110103...

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