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. [. . . ] 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. 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. If it still does not stop, pull off the fuel line from the carburetor. [. . . ] Finally, occasionally remove the needle-valve holder from the carburetor as shown in Photo and extract any remaining foreign matter that may have lodged in the location shown in Photo, right. Remove this with an 8mm spanner Dirt and fbrous matter mostly accumulate here 21 ADJUSTING CHART High Speed Needle Valve - 2 turns opened from fully closed position. Medium Speed Needle Valve - 1 turns opened from fully closed position. Idle Mixture Control Screw - 2 turns opened from fully closed position. Start the engine Warm up the engine Observe the mixture condition while "floating" the model Lean mixture Turn the Idle Mixture Control Screw counterclockwise 10 degrees Rich mixture Turn the Idle Mixture Control Screw clockwise 10 degrees Idling OK Observe the hovering mixture condition Lean mixture Open the High Speed Needle Valve (Turn counter-clockwise) Rich mixture Close the High Speed Needle Valve (Turn clockwise) Hovering OK Land the model 22 Idle for approx: 10 seconds, then reopen throttle to observe transition ("Float" the model) Lean mixture Turn the Idle Mixture Control Screw counterclockwise 10 degrees Rich mixture Turn the Idle Mixture Control Screw clockwise 10 degrees Idling OK High Speed Flight Lean mixture Open the High Speed Needle Valve (Turn counter-clockwise) Rich mixture Close the High Speed Needle Valve (Turn clockwise) High Speed Flight OK Fine tuning of idling mixture Lean mixture Turn the Idle Mixture Control Screw counterclockwise 10 degrees Idling OK Rich mixture Turn the Idle Mixture Control Screw clockwise 10 degrees Fine tuning of hovering mixture Lean mixture Rich mixture Open the Medium Speed Needle Valve Hovering OK Adjustment completed Close the Medium Speed Needle Valve INSTALLATION OF THROTTLE SERVO After the engine is installed in the helicopter, please observe the following recommendations when linking the throttle servo to the carburetor. Locate the servo so that its output arm and the throttle pushrod are, as close as possible, directry in line with carburetor's throttle arm, as shown. Servo output arm Throttle control rod A and B should be equal length. 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. [. . . ]