User manual OS ENGINES MAX-70SZ-H

[. . . ] 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. [. . . ] Mixture gets lean when the Mixture Control Screw is turned right, while mixture gets rich when the Mixture Control Screw is turned left. With a model helicopter, adjustments may vary due to various factors such as climatic conditions, fuel, muffler, main rotor, weight of the model, gear ratio, etc. Therefore, the Mixture Control Screw position will vary with each model and set- up, and it is normal if the Mixture Control Screw position is off center. MIxture Control Screw Graduations on the carburetor body Fully opened position Carburetor Rotor 86 degrees Fully closed position Carburetor Body As shown in the sketch, the carburetor has graduation marks. 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. Thick Lean Mixture Control Valve 14 STARTING Be sure to use a muffler pressurized fuel feed. Use the same fuel as you intend to employ for actual operation of your model. Opening and closing of the Needle-Valve Turn the needle clockwise to close the needle-valve, and turn the needle counter-clockwise to open the needle-valve as shown in the sketch. Close 3. Preparation of the starter Install the starting shaft to the starter securely. Improper installation will allow the shaft to swing creating a dangerous situation. 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. Open 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 one turn open from the fully closed position. 5. Inserting the starter shaft Insert the starting shaft into the shaft cup securely. 6. Priming Without energizing the glowplug, open the throttle a little from the idling position. Turn the engine over using the starter until the fuel is seen to reach carburetor. 15 7. Preparation of starting Make sure that the transmitter throttle stick is at the fully closed position and the throttle trim at center position, and make sure that idle-up switch on the transmitter is off. Hold the rotor head by hand so that rotor cannot rotate when the engine is Started. Also, steady the model with a foot on the landing gear skid. [. . . ] Set the linkage so that the servo output arm and throttle arm are parallel when the throttle stick on the transmitter is at middle position. If differential throttle movement is required, make necessary adjustment at the transmitter. Throttle arm 23 CARE AND MAINTENANCE 1. The minute particles of foreign matter, that are present in any fuel may, by accumulating and partially obstructing fuel flow, cause engine performance to become erratic and unreliable. 'Super-Filters' (large and small)are available, as optional extras, to deal with this problem. [. . . ]