User manual YS 61R-AR

[. . . ] This concludes the break-in procedure, it is advisable to always use a slightly rich setting to keep the moving parts lubricated, even after the break-in period . 48 20 High Speed NeedleValve 45 Fig. 2 0 - 0. 1mm Fuel Filter Tube (B) HIGH SPEED ADJUSTMENT 1. Adjustment of high speed is done by the carburetor needle valve. When the needle valve is turned clockwise, the mixture is leaner. When it is turned counterclockwise, the mixture is richer. A good starting position for the high speed needle valve is 2 1/2 turns open from the fully closed position. 87 Tube (A) 35 Front Nut Rear Nut 97. 5 Low Speed Needle Valve Check Valve 2. When the engine is started, open the throttle gradually. [. . . ] The engine may stop if the throttle is opened to full immediately after starting. Wait until the engine temperature rises and then open the throttle slowly . For flying, it is advisable to use a slightly richer mixture setting. By using a richer mixture, the engine temperature is maintained and RPM stability improves. CAM GEAR TIMING ADJUSTMENT If for some reason you have to disassemble your engine, please follow these important steps on reassembling the cam gear. Remove the carburetor and backplate assembly. Notice the impression made on the crankshaft counterweight. Position it directly straight down or in line with the case outer seam line. 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 61R-AR has set the standard by which all other 4 stroke engines in this size category are judged. · New regulator design for more reliable operation in high temperature conditions. · New cylinder desighn provides higher power and improves cooling for longer life. Let it idle for 20 to 30 seconds and then slowly advance the throttle. The adjustment is satisfactory at low speed if transition is smooth at this time. If the engine is running 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 counterclockwise 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. IMPORTANT!The regulator adjusting screw on this engine is factory set. If for some reason you have to disassemble the regulator assembly, the regulator adjusting screw should be set flush with the regulator body. INSTALLATION l. Connect the engine to the tank as shown in fig. 1. Since high pressure is applied to the tank, tighten all connections carefully. Care must be taken to prevent pressure leakage due to under tightening of the check valve or by kinking the fuel lines. [. . . ] This primes the system by pressurizing the tank and sending fuel to the carburetor. Close the throttle to the idle position and connect the glow plug battery. The engine is now ready for starting. DO NOT ATTEMPT TO START FULL THROTTLE, AS THIS IS VERY DANGEROUS. 2. Match the direction of the check valve arrow fig. 1 with the arrow facing to wards the tank. NO. 1 2 3 4 5 6 7 8 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 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 PART# YS5000 YS5005 YS5010 YS2810 YS2815 YS2820 YS2030 YS2040 YS5015 YS2840 YS2845 YS2850 YS2855 YS2860 YS2865 YS4380 YS2875 YS2880 YS2885 YS2890 YS2895 YS0825 YS0830 YS5020 YS4390 YS4395 YS2925 YS2930 YS0560 YS0565 YS2935 YS2940 YS0580 YS2945 YS2950 YS2955 YS4400 YS2960 YS2965 YS2970 YS2975 YS2980 YS2985 YS4000 YS2990 YS2995 YS3000 YS0640 YS3005 YS3010 YS5090 YS3015 YS3020 YS3025 YS1090 YS0200 YS0785 YS0790 YS3090 YS3030 YS2695 YS2700 YS0775 YS2710 YS3035 YS4010 YS4015 YS3040 YS3045 YS5075 YS5025 YS5030 YS5035 YS5040 YS5045 YS5050 YS5055 YS5060 YS5065 YS5070 YS3095 YS3065 YS3070 YS3075 YS5080 YS5085 DESCRIPTION Crankcase Cylinder head assy. [. . . ]