User manual OS ENGINE MAX-55HZ HYPER

[. . . ] 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. CONTENTS SAFETY INSTRUCTIONS AND WARNINGS ABOUT YOUR O. S. [. . . ] Therefore the Mixture Control Screw position varies with each model and set- up, and it is normal if the Mixture Control Screw position is off the center. MIxture Control Screw GRADUATIONS ON THE CARBURETOR BODY As shown in the sketch, the carburetor has graduation marks. Fully opened position 89 degrees Fully closed position Carburetor Body Carburetor Rotor When the triangle mark on the carburetor rotor meets the far right mark, the throttle is fully closed. When the triangle mark meets the top mark, the throttle is fully open. You may use the other three marks as the reference marking of throttle opening to your preference when hovering. Never try to check the triangle mark position while the engine is running and rotor is rotating, or you may be hit by rotating rotor which results in serious injury. Stop the engine and rotor before checking the triangle mark position. Rich Lean Mixture Control Valve 20 STARTING Be sure to use an electric starter to start the engine. Never fail to check the tightness of screws and nuts, especially engine mounting and moving parts (e. g. Use the same fuel as you intend to employ for actual operation of your model. When filled, prevent the fuel from flowing into the carburetor with a commercially available fuel stopper, etc. Make sure that plug element glows red, and install the plug in the cylinder head. Pliers WARNING When checking the plug element hold the plug with tools, such as pliers, etc. Do not hold near your face or the fuel remaining in the filament may burn you. 21 1. Opening and closing of the Needle-Valve Turn the needle clockwise to close the needlevalve, and turn the needle counter-clockwise to open the needle-valve as shown in the sketch. Idle Mixture Control Screw: High Speed needle-valve Close Open Medium Speed needle-valve: 2. High Speed needle-valve: exactly two turns open from the fully closed position. (Note: If a different muffler is used, this setting may require readjustment) Idle Mixture Control Screw: at basic position when the engine leaves the factory. Medium Speed needle-valve: exactly two turns open from the fully closed position. Preparation of the starter Install the starting shaft to the starter securely. Improper installation will allow the shaft to swing creating a dangerous situation. 4. Checking the rotating direction of the starter Make sure that the starter rotates to the direction shown in the sketch. If the direction is reverse, reverse the leads on battery. 22 5. Inserting the starter shaft Insert the starting shaft into the shaft cup securely. Hold the rotor head by hand so that rotor cannot rotate when the engine is Started. Starting Connect the battery to the glowplug and start the engine by applying the starter. When started, switch off the starter and withdraw the starting shaft after making sure the rotation of the starter shaft stops. Stopping the engine Fully pull down the throttle trim on the transmitter. 6. [. . . ] Install an in-line fuel filter between the tank and carburetor to prevent foreign matter in the tank from entering the carburetor. If these precautions are neglected, restriction of fuel flow may cause the engine to cut out, or the fuel/air mixture to become too lean causing the engine to overheat. The use of modern high-performance alcohol based model engine fuels, while promoting cooler running, improved anti-detonation combustion and increased power, have the disadvantage of causing corrosion due to the acid by-products of combustion. The use of nitromethane in the fuel can also contribute to the problem. 32 Do not close the needle-valve and mixture control valve too far as this will cause a lean setting and over heating of the engine. [. . . ]