User manual YS 140LIMITED

[. . . ] 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. Run engine at this setting for approximately 20 minutes with the throttle moving from low to high speed. 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. [. . . ] Disassemble the regulator and clean with alcohol or appropriate cleaner. When reinstalling the regulator, use a new gasket and note that the small casting tab on the regulator goes towards the propeller. Open the check valve by rotating the body counterclockwise. Check to make sure air will only past though the check valve one way. Tube (B) YS Fuel Filters (YS1195/not included) 128 LOW SPEED ADJUSTMENT This engine is equipped with a new low speed needle valve to adjust the mixture from low to mid throttle. See fig. 1 for location. FEATURES The YS140 Limited was developed for the serious competitor in mind. As aircraft increases in size, so does the need for power. With a few modifications internally, YS was able to generate more power in the same 140 case. The YS 4 cycles are so unique, almost every square inch is used in some way to produce power. * Supercharged * Fuel Injected * Regulated and Pressurized Fuel System * High and Low Speed Adjustments PROPELLER INSTALLATION Due to the high torque of the140L engine, we have equipped it with a double locknut system for safety. Mount the propeller and tighten the rear nut. Next, tighten the front nut as shown in fig. 2. The rear nut has a offset shoulder so the front nut will secure itself to the rear nut. Select a good quality propeller that will allow the engine to run at maximum speed between 8, 000 to 9, 000rpm range. We recommend sizes 14x14, (15x12 through 14), (16x11 through 14). 1. Factory starting position is 1 1/2 turns open from the fully closed position. The low speed needle should be set after the high speed needle has been adjusted. Close the throttle gradually to an idle (approximately 2, 000rpm). Let it idle for 15-20 seconds and then slowly advance the throttle. The adjustment is set when low to high speed has a smooth transition. If the engine is running rough at idle or to rich, turn the low speed needle counterclockwise to lean out the low end. If the engine speeds up at idle , the low speed mixture is to lean. Turn the low speed needle clockwise to richen the mixture. [. . . ] Match the direction of the check valve arrow in fig. 1, with the arrow facing towards the tank. Remove tube A from the check valve, (CAUTION) Tank pressure must be release first before tube B is opened. Remove tube B and begin to fill fuel tank. Open the high speed needle 2 1/2 turns from the closed position. [. . . ]