User manual YS 91SR

[. . . ] Turning the needles clockwise will lean the fuel mixtures and counter clockwise will richer the fuel mixtures. 5. Thehighspeedneedlerefinesthefuelmixturefor forward flights without affecting the hovering adjustment. After the engine is started and warmed up, lift off into a hover and check that the engine is running smoothwithagoodtrailofsmoke. Ifeverythingisfine, open the throttle and enter forward flight. [. . . ] 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. DO NOT use any other type of check valve. The check valve is designed exclusively for the 91SR. Adjust your throttle linkage and curve using the alignment indentations on the carburetor body located on the throttle arm side of the carb body. PLEASE NOTE that the hover position is at 40% see FIG 2. 4. Land the helicopter for approximately 20~30 seconds. 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. Use only glow fuel of methanol for cleaning. 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. AlwaysremoveTube(A)atthecheckvalvefirstbefore fueling. 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. [. . . ] Close the throttle to the idle position and connect the glow plug driver. The engine is now ready for starting. Hover 40% NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 PART# YS5820 YS5825 YS5830 YS4785 YS5840 YS5845 YS5850 YS2385 YS4803 YS4805 YS5855 YS1050 YS5860 YS5243 YS0490 YS5865 YS5870 YS1070 YS5880 YS4830 YS5885 YS1090 YS4485 YS2695 YS2700 YS2705 YS2710 YS4140 YS2695 YS4845 YS4150 YS0200 YS2435 YS4850 YS2445 YS4155 YS2460 YS2480 YS2475 YS3036 YS2510 YS5890 YS5875 YS5895 YS5835 YS4480 DESCRIPTION Crankcase Cylinder Head Head Gasket Head Screws Cylinder Liner Piston Piston Ring Wrist Pin Wrist Pin Retainer Con Rod Crankshaft Front Bearing Rear Bearing Drive Washer Spacer Propeller Nut Back Plate Back Plate O ring Back Plate Screw Carburetor Body Carburetor Gasket Throttle Barrel Throttle Barrel Retainer Hover Needle Valve Hover Needle O Ring Hover Needle Seat Hover Needle Seat O Ring Needle Detent High Speed Needle High Speed Needle O Ring Low Speed Needle Low Speed Needle O Ring Throttle Arm Carburetor Screws Carburetor Subplate Regulator Subplate Regulator Assy. [. . . ]