User manual YS DZ160

[. . . ] 1 Use the same size ( or slightly smaller ) propeller than you intend to use in flying. 2 Use a good quality fuel containing 15% to 30% nitro, and oil content of 20% to 24%. If you use caster oil, no more than 2% is recommended. DO NOT USE FOUR CYCLE FUEL DUE TO LOW OIL CONTENT. TAPPET ADJUSTMENT Tappet clearance is preset at the factory. Adjustment, if you needed, should be checked after the initial break-in. [. . . ] FUEL PUMP If you must disassemble the fuel pump to change the diaphragm or to clean, take care that the valves and springs are replaced in exactly the same manner in which they were removed. Use care with filtering your fuel and keeping the entire fuel system in good working order. It will help to prevent fuel pump problems. fig. 1 3 After the engine has started, slowly bring the throttle up to full. Set high speed needle so it is running at a good rich setting without the glow driver. 4 After the initial 20 minute break-in, mount the engine in the aircraft and set the high speed to a richer than normal setting for the first 10 flights. This will help to lubricate all moving parts. FEATURES The DZ160 was developed for serious aerobatics competition and large IMAC style aircraft. It differs from previous YS Engines in that it does not use a high pressure fuel system but rather a true fuel pump. *Crankcase supercharging system unique to YS 4 stroke engines *Fuel injected *Convenient fuel pump adjustment *High horsepower output with long service life GLOW PLUG Select the most appropriate glow plug from those designed specifically for 4 cycle engines. Glow plug selection greatly affects the maximum engine output and low idle. If RPM's decrease or stop when the booster cord is removed, replace the plug. We recommend the YS#4 plug for maximum performance. These are available from YS Parts & Service or your favorite dealer. INSTALLATION WE RECOMMEND THAT THIS ENGINE BE MOUNTED ON A SHOCK ABSORBING SOFT MOUNT PROPELLER INSTALLATION Due to the high output power of the DZ160 engine, it is supplied with a double locknut system for added safety. If you use any other type of spinner or prop nut device, make sure it is of the double nut type. 1 Mount the propeller and tighten the rear nut. Next, tighten the front nut as shown in fig. 2. The rear nut has an offset shoulder so the front nut will secure itself to the rear nut. 2 Select a good quality propeller that will allow the engine to run at maximum speed between 7, 800 to 9, 000 rpm range. Other prop sizes may be used as long as the correct rpm range. HIGH SPEED NEEDLE ADJUSTMENT 1 Adjustment of the high speed is done by the carburetor needle valve. When the needle valve is turned clockwise, the mixture is leaner. When it is turned counter-clockwise, the mixture is richer. A good starting position for the high speed needle valve is 2 turns open from the fully closed position. At this setting the engine will be very rich and may die when you remove the glow driver. [. . . ] With this filter, you must remove the cloth portion of the filter and leave both the metal filter screens in place. Front Nut Rear Nut fig. 2 The low speed adjustment is the regulator screw on the front of the engine. Turning the screw clockwise will richen the idle mixture, and counter-clockwise will lean the idle mixture. It is preset at the factory but may require further adjustment depending on fuel and conditions in your areas. 1 Wait until the engine is up to operating temperature before adjusting the idle mixture 2 Close the throttle gradually to an idle ( approximately 2, 200 rpm ). [. . . ]