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Detailed instructions for use are in the User's Guide.
[. . . ] Once this is done take note of the amount of smoke being produced by the muffler. The mixture is correct for hover when there is a steady stream of smoke being produced. Land the helicopter for approximately 20~30 seconds. [. . . ] New stroke design for superior operation New carburetor design for easier adjustments. Factory preset fuel regulator.
START UP
1. Always remove Tube(A) at the check valve first before fueling. The fuel tank is pressurized and you need to relieve the pressure first. Disconnected Tube(B) at the filter and fill the tank. From the fully closed (clockwise) position, turn the needle valves counter clockwise as follows. Close the throttle to the idle position and connect the glow plug driver. The engine is now ready for starting.
STARTING SETTING / OPERATING SETTING
5. High Needle refines the fuel mixture for forward flights without affecting the hovering adjustment. After the engine is started and warmed up, liftoff into a hover and check that the engine is running smooth with a good trail of smoke. If everything is fine, open the throttle and enter forward flight. Take note of the amount of smoke like we did in a hover adjust ment. It is correct when you see a noticeable steady smoke trail. Adjust the high-speed needle valve to obtain slightly rich but consistent setting.
WARRANTY
Strict quality control is implemented by our factory in all phases, from parts manufacturing to final assembly. If performance deteriorates or a part fails due to a manufacturing error, YS engine will repair or replace the engine at no charge in the period of one year from date of purchase. Warranty does not cover normal maintenance. [. . . ] The check valve is de signed exclusively for the 56SR. Adjust your throttle linkage and curve using the alignment indentations on the carburetor body located on the throttle arm side of the carb body. PLEASE NOTE that the hover position is at 40% see FIG 2.
Fig. 2
Hover 40%
B A
Hover Needle Idling Needle High Needle
2 times open / 1. 0~2. 0 Factory Set ( 0. 5 ) / 0. 2~1. 0 Factory Set (1. 0 ) / 0. 5~1. 5
Low Speed 0%
High Speed 100%
BREAK-IN
It is not necessary to mount this engine on a set stand for break-in. [. . . ]
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