User manual YS 50ST

[. . . ] OPERATOR'S MANUAL 50ST (Part No. YS0030) Fig, 1 Bore Stroke Displacement Main Needle Valve 42. 3 17. 5 44 STARTING PROCEDURE For the best overall performance with your 50ST Helicopter Engine, we recommend 30% nitro fuel blended especially for helicopter use. Lower nitro percentages may be used, but reduced performance will result. The fuel tank is pressurized by the engine and you need to relieve the pressure. [. . . ] This pressurizes the fuel tank and the engine is now now ready for starting. Set the throttle barrel to low speed and connect the glow driver before starting the engine with the electric starter. If the engine refuses to start, remove the glow driver, open the main needle valve 2 turns from its present setting and repeat Step 3. After starting, return the main needle to its running setting before advancing the throttle. Fig. 2 High Speed 100% Hover 40% B A Low Speed 0% Check Valve 37 Tube (A) Tube (C) : 35mm BREAK-IN It is not necessary to mount this engine on a test stand for break-in. However, the engine should be adjusted slightly on the rich setting for the first few flights to ensure proper breakin. Always use a good quality fuel which contains 30% nitro and an oil content of 20-30%. FEATURES The YS 50ST Engine features the patented YS regulated fuel system for positive fuel flow during all types of flight conditions. Factory authorized parts and service available worldwide. INSTALLATION 1. The fuel lines should be connected to the fuel tank as shown in the above diagram. Since the tank is exposed to high pressures, be sure that all connections are secure to prevent pressure leakage. Since the engine is sensitive to dirt in the fuel, a fuel filter must be used. Tube (C) should be set exactly at 35mm between the engine and the check valve. Take care not to touch the engine immediately after shutdown to avoid painful burns. When starting the engine, do not use full throttle but set throttle to low speed before applying the glow driver. If you are not properly trained to operate this engine, please get assistance from a skilled modeler. The user is responsible for operating this engine in a safe safe manner. IDLE ADJUSTMENT Begin with the idle needle with 1 turn open from closed (clockwise) and adjust from that point. Turning this needle clockwise will lean the fuel mixture, and counter-clockwise will richen the fuel mixture. [. . . ] If performance deteriorates or a part fails due to a manufacturing error, YS Parts and Service will repair or replace the engine at no charge in the period of one year from date of purchase. Should the engine be modified, incorrectly assembled or abused, there will be a normal charge for parts and labor. Specifications may be changed without prior notice. 2007 JAN YS P a r t s a n d S e r v i c e 1370PorterDriveMindenNV89423 Phone:775-267-9252 Fax:775-267-9690 [. . . ]