User manual YS 140LIMITED

[. . . ] The engine must be at top dead center on the compression stroke before any adjustment are made. fig. 1 SPECIFICATIONS Bore Stroke Displacement Weight Practical rpm 32mm 29. 0mm 23cc 890g 2, 000 -12, 000rpm 58 1. Use the same size (or slightly smaller) propeller than you intend to use in flying. Use a good quality fuel which contain 15-30% nitromethane and an oil content of Low Viscosity oil 20-24% oil. [. . . ] The engine may stop if the throttle is opened to full immediately after starting. Wait until the engine has warning up and pressure has developed in the tank. DIAPHRAGM AND CHECK VALVE DISASSEMBLY Diaphragm; 1. 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. 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. 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. 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. 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. 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 is to lean on the low end, it can detonate and stop when transition from low to high RPM. IMPORTANT! Silicone rubber is used in the YS engine. Gasoline and other volatile solutions will damage the silicone if used. Do not use petroleum based oils as after run lubricants. 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. [. . . ] Care must be taken to prevent pressure leakage due to undertightening of the check valve or by kinking the fuel lines. 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. [. . . ]