User manual YS FZ63

[. . . ] Synthetic or castor oil can be used, or a combination of synthetic and castor. Do not use four cycle fuel due to low oil content. The needle valve should be set so that the engine is running at a rich setting. Run the engine approximately 20 minutes with this setting. 48 20 31 High Speed needle Valve Check Valve Tube A 87 4. [. . . ] When reinstalling the cam gear, the side with a point mark should be facing the opening of the gear box. Note that it should also be mounted with the point mark located towards the top of the engine just below the cam followers. FEATURES The FZ63 is the most powerful 4 cycle engine of its size and was developed for sport flying as well as power demanding acrobatics. · Supercharged system · Fuel injected · Regulated and pressurized fuel system · Muffler The pressurized fuel and injection system makes throttle response superior and is unaffected by tank level. PROPELLER INSTALLATION Due to the high torque of the FZ63 engine, we have equipped it with a double lock system for safety. Mount the propeller and tighten the rear nut. Next, tighten the front nut as shown in Fig. 1. Select a good quality propeller that will turn in the 9, 000 to 12, 000 rpm range. We recommend sizes 11x7-11x9, 12x6-12x8. LOW SPEED ADJUSTMENT This engine is equipped with a new low speed needle valve to adjust the mixture from low to mid throttle. This needle valve is located on the side of the throttle barrel opposite the throttle arm (Fig. 1). Open the low speed needle to 1 turns from fully closed position. The low speed needle valve should be set after the high speed needle valve has been adjusted. Close the throttle gradually to a idle (approximately 2500rpm). Let it idle for 20 to 30 seconds and then slowly advance the throttle. The adjustment is satisfactory at low speed if transition is smooth at this time. If the engine is running rough on idle, the low speed mixture is rich. If the engine starts to speed up and dies on idle or starts to detonate, when advancing the throttle, the mixture is lean. Turn the low speed needle valve clockwise to richen and counterclockwise for a leaner mixture (note that the direction of the low speed needle valve is opposite the high speed needle valve). Adjustments to the low speed needle valve should be 1/8 to 1/4 of a turn increment at a time to achieve smooth throttle response. The regulator adjusting screw on this engine is factory set. If for some reason you have to disassemble the regulator assembly, the regulator adjusting screw should be set flush with the regulator body. DIAPHRAGM AND CHECK VALVE DISASSEMBLY Diaphragm 1. Remove the adjustment screw of the valve, and then remove the inside valve and spring. [. . . ] Close the throttle to the idle position and connect the glow plug battery. DO NOT ATTEMPT TO START FULL THROTTLE, AS THIS IS VERY DANGEROUS. INSTALLATION l. Connect the engine to the tank as shown in fig. 1. Since high pressure is applied to the tank, tighten all connections carefully. [. . . ]