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Detailed instructions for use are in the User's Guide.
[. . . ] If everything is fine, open the throttle and enter forward flight. Take note of the amount of smoke like we did in a hover adjustment. It is correct when you see a noticeable steady smoke trail. [. . . ] As soon as the engine stops running, be sure that a fuel line clamp is used in Tube-B to prevent fuel from flowing into the engine. On the final flight of the day, the fuel line clamp should be used to stop the engine in order to prevent rust and corrosion. FUEL AND GLOW PLUG
We have found that the fuel and glow plugs listed below will give the best engine performance. Fuel Powermaster 30% Special Heli Blend Cool Power 30% Special Heli Blend Glow Plug _ Enya #3 OS #8 OS-A3 YS#2
Check Valve Factory Set Do Not Adjust
Tube (A)
Tube (C) 3 15/16"(10cm)
FEATURES
The YS 80ST is the latest in helicopter engine technology from YS. It is a bored and stroked version of our popular YS61ST-2 which has been optimized to provide the ultimate in reliable horsepower for your helicopter. New large bore cylinder design for superior operation. New carburetor design for easier adjustments. Same physical size as YS61ST-2 making it easy to add more power to your helicopter. Up to 20% more power than your present helicopter engine.
2. Since the engine is sensitive to dirt in the fuel, a fuel filter must be used. Tube(C) should be set exactly at 3 15/16" or (10cc) between the engine and check valve. DO NOT use any other type of check valve. The check valve is designed exclusively for the 61ST. 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.
IMPORTANT!Silicone rubber is used in many parts of the YS engine. [. . . ] Please check with your helicopter manufacturer to obtain the correct gear ratio.
INSTALLATION
1. The fuel lines should be connected to the fuel tank as shown in the above figure. Be careful to install the check valve in the correct direction. [. . . ]
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