User manual YS 91SR S

[. . . ] OPERATOR'S MANUAL 91SR S (Helicopter Engine/ Part No. YS0074) Fig. 1 52mm BREAK-IN Bore Stroke Displacement Weight Practical rpm SPECIFICATIONS 27mm 26mm 14. 89cc 553g 2, 000 ~17, 000 It is not necessary to mount this engine on a set stand for break-in. However, the engine should be adjusted slightlyontherichsettingforthefirstfewflightstoinsure proper break-in. [. . . ] Once this is done take note of the amount of smoke beingproducedbythemuffler. Themixtureiscorrect for hover when there is a steady stream of smoke being produced. FUEL AND GLOW PLUG We have found that the fuel and glow plugs listed below will give the best engine performance. Fuel Powermaster 30% Special Heli Blend Cool Power 30% Special Heli Blend Glow Plug _ YS #2 Enya #3 OS #8 Check Valve Factory Set Do Not Adjust Tube (A) Tube (C) 3 15/16"(10cm) FEATURES The 91SRS is the latest in helicopter engine technology from YS. New stroke design for superior operation New carburetor design for easier adjustments. Tube(C) should be set exactly at 3 15/16" or (10cm) between the engine and check valve. Adjust your throttle linkage and curve using the alignment indentations on the carburetor body located on the throttle arm side of the carb body. Lift the helicopter into a hover again taking note of the transition from idle to hover. If the engine exhibits a large amount of smoke and the throttle response is sluggish, you will need to adjust the idle and or the hover needle leaner to achieved a smooth transition. If the engine detonates and the smoke is inconsistent or a small amount is produced, the mixture is too lean. IMPORTANT! Silicone rubber is used in many parts of the YS engine. Gasoline and other volatile solutions will damage silicone if used. CAUTION Using gear ratios higher than 9. 0 to 1 may result in engine damage from overspeed. WARRANTY START UP 1. The fuel tank is pressurized and you need to relieve the pressure first. Disconnected Tube(B) at thefilterandfillthetank. ReconnectTube(A)and(B). From the fully closed (clockwise) position, turn the needle valves counter clockwise as follows. STARTING SETTING / OPERATING SETTINGSTARTIN STARTING SETTING / OPERATING SETTING Fig. 2 High speed 100% GEAR RATIO You should be using an engine to main rotor gear ratio of 1-7. 5 to 1-8. 0. Please check with your helicopter manufacturer to obtain the correct gear ratio. Low speed 0% Strict quality control is implemented by our factory in all phases, frompartsmanufacturingtofinalassembly. [. . . ] Diaphragm Regulator gasket Regulator Screws Nipple Check Valve Gasket Set Carburetor Assy. O ring set Piston / Ring / Liner Set Needle Valve Assy. QTY 1 1 1 6 1 1 1 1 2 1 1 1 1 1 1 1 1 4 1 1 1 1 1 1 1 2 1 1 1 1 1 1 2 1 1 1 1 1 2 1 1 35 37 38 33 15 14 12 13 41 11 34 30 20 27 29 28 31 18 16 17 32 21 19 26 25 27 24 23 22 4 2 7 3 9 8 9 6 10 40 5 1 36 39 1370 PORTER DRIVE MINDEN NEVADA 89423 Phone: 775-267-9252 Fax: 775-267-9690 YS Parts and Service 2010 03 [. . . ]