User manual YS FZ140-SPORT

[. . . ] Synthetic oil is recommended, or a blend of synthetic oil and a small amount of caster oil may be used. The needle valve should be set so that the engine is running at rich setting. This concludes the break-in procedure, It is advisable to always use a slightly rich setting to keep the moving parts lubricated, even atter the break-in period . TAPPET CLEARANCE ADJUSTMENT 1. [. . . ] When reinstalling the cam gear, the side with a point mark should be facing the opening of the gear box, Note that it should also be mounted with the point mark located towards the top of the engine just below the cam followers. FEATURES PROPELLER INSTALLATION The new FZ140 Sport uses the best features of our very successful 120 and 140 engines, combined in an easy-to-operate and economical package. It is ideally suited to aircraft which previously used the YS120, as the mounting dimensions are the same. An added bonus is that the weights are essentially equal, and the FZ140 Sport will turn larger propellers for higher flight performance. Due to the high torque of the FZ140 Sport , we have equipped It with double locknuts for safety. Select a good quality propeller that will turn in the 8, 000 to 9, 000 range, We recommend sizes 14x14 through 16x11 LOW SPEED ADJUSTMENT This engine is equipped with a new low speed needle valve to adjust the mixture from low to mid throttle. This needle valve is located on the side of the throttle barrel opposite the throttle arm (Fig. 1) 1. Open the low speed needle valve to 1 1/2 turns from fully closed position. The low speed needle valve should be set after the high speed needle valve has been adjusted. Let it idle for 20 to 30 seconds and then slowly advance the throttle. The adjustment is satisfatory at low speed if transition is smooth at this time. If the engine is runnlng rough on idle, the low speed mixture is rich. If the engine starts to speed up and dies on idle or starts to detonate, when advancing the throttle, the mixture is lean. Turn the low speed needle valve clockwise to richen and counterclocwise for a leaner mixture (note that the direction of the low speed needle valve is opposite the high speed needle valve). Adjustments to the low speed needle valve should be 1/8 to 1/4 of a turn increment at a time to achieve smooth throttle response. DIAPHRAGM AND CHECK VALVE DISASSEMBLY Diaphragm: 1. Remove the adjustment screw of the valve, and then remove the inside valve and spring. Reassemble the check valve carefully. 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. lf RPM's decrease or stop when the booster cord is removed, replace the plug. [. . . ] If the muffler is mounted inside the cowling, extra cooling air is necessary to prevent muffler failure due to excessive heat build up. Gasoline and other volatile solutions will damage the silicone if used. FZ140 Sport Parts LIST # 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 42 43 44 45 46 47 48 49 50 51 52 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 Part# YS4890 YS0505 YS0510 YS0515 YS2605 YS2610 YS2160 YS2165 YS2170 YS2175 YS2180 YS0555 YS0560 YS0565 YS0570 YS0575 YS0580 YS2615 YS4900 YS2625 YS2630 YS0605 YS2635 YS2640 YS2645 Description Crankcase Valve Cover Valve Cover Gasket Valve Cover Screws Head Gasket Cylinder Head Intake Valve Exhaust Valve Spring Set Spring Retainer Set Spring Retainer Clip Set Rocker Arm Set Valve Adjuster Set Adjuster Nut Set Rocker Arm Shaft Shaft Set Screw E-Ring Clip Set Head Bolt Set Crankshaft Cylinder Liner Piston Wrist Pin Wrist Pin Retainer Set Piston Ring Connecting Rod Back Plate Disc Valve Disc Valve Pin Retainer screw Back Plate Gasket Back Plate Screw Set Cam Gear Cover Cam Cover O-Ring Cam Cover Screw Set Cam Gear Cam Followers Push Rod Set Push Rod Cover Set Push Rod Cover O-Ring set Front Bearing Front Bearing Oil Seal Rear Bearing Cam Bearing Set Fuel Nipple Set Regulator Body Regulator Adjusting Screw Regulator Adj Screw O-Ring Diaphragm Regulator Plunger Plunger Spring Regulator Gasket Regulator Screw Set Carburetor Body Throttle Barrel Low Speed Adjusting Screw Low Speed O-Ring High Speed Needle Valve High Speed Needle O-Ring High Speed Needle Seat Needle Seat O-Ring Set Needle Valve Detent Throttle Barrel Seal Throttle Barrel Retainer Throttle Stop Screw Throttle Stop Spring Throttle Arm Carburetor Gasket Drive Washer Drive Washer Retainer QTY 1 1 1 2 1 1 1 1 2 2 4 2 2 2 1 1 2 5 1 1 1 1 2 1 1 1 1 1 1 1 6 1 1 2 1 2 2 2 4 1 1 1 2 6 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 YS0645 YS2655 YS0655 YS0660 YS2235 YS2660 YS0675 YS2665 YS2670 YS0690 YS1050 YS2240 YS0701 YS0705 YS0710 YS0715 YS0195 YS0725 YS0730 YS0176 YS0180 YS0745 YS0750 YS4210 YS4920 YS2050 YS2060 YS2690 YS2695 YS2700 YS2705 YS2710 YS2255 YS1090 YS0785 YS0790 YS0200 YS2260 YS2715 YS2720 # 71 72 73 74 75 Part# YS0835 YS0840 YS1540 YS2270 YS0830 YS2725 YS2730 YS4915 YS2740 YS4905 YS4925 YS4930 YS4345 YS4350 Description Intake Pipe Intake Pipe O-Rings Wrist Pin Access Plug Propeller Washer Propeller Nut Set Gasket Set O-Ring Set Carburetor Assembly Needle Valve Assembly Back Plate Assembly Muffler set Muffler Exhaust pipe Lock Nuts QTY 1 4 1 1 2 WARRANTY Strict quality control is implemented by our factory in all phases, from parts manufactiring to final assembly. If performavce deteriorates or a part fails within one year of purchase due to a manufacturing error, YS will repair or replace the engine at no charge. [. . . ]