Yamaha F50 Service Manual
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62Y3A118-20 1 2 3 4 5 6 7 8 I Checking the fuse 1. Check the fuse and fuse holder for conti- nuity. Replace if there is no continuity. Checking the wiring harness (10 pins) 1. Check the wiring harness for continuity. Replace if there is no continuity. Checking the neutral switch 1. Check the neutral switch for continuity. Replace if there is no continuity. Checking the starter relay 1. Connect the digital circuit tester leads to the starter relay terminals. 2. Connect the brown (Br) lead to the posi- tive battery terminal. 3. Connect the black (B) lead to the nega- tive battery terminal.4. Check for continuity between the starter relay terminals. Replace if there is no continuity. 5. Check that there is no continuity between the starter relay terminals after discon- necting the brown or black lead. Replace if there is continuity. Lead color Brown (Br) Brown (Br) Free Push Starting system
ELECElectrical systems –+ 8-2162Y3A11 Starter motor8
62Y3A118-22 1 2 3 4 5 6 7 8 I No. Part name Q’ty RemarksTightening torques Stage N·mkgf·mft·lb 1 Clip 1 2 Pinion stopper 1 3Spring 1 4 Starter motor pinion 1 5 Upper bracket 1 6 O-ring 1 Not reusable 7 Washer 1 1 8Shim—As required 9 Washer 2 1 10 Armature 1 11 Stator 1 12 O-ring 1 Not reusable 13 Brush holder assembly 1 14 Brush set 1 15 O-ring 1 Not reusable 16 Washer 1 17 Spring washer 1 18 Nut 1 9 0.9 6.5 19 Lower bracket 1 20 Screw 2 M4 × 12 mm 21 Bolt 2 M5 × 125 mm Starter motor
ELECElectrical systems –+ 8-2362Y3A11 Removing the starter motor pinion 1. Slide the pinion stopper 1 down as shown, and then remove the clip 2 . Checking the starter motor pinion 1. Check the pinion teeth for cracks or wear. Replace if necessary. 2. Check for smooth operation. Replace if necessary. NOTE: Turn the pinion clockwise to check that it operates smoothly and turn it counterclock- wise to check that it locks. Checking the armature 1. Check the armature axial free play. Replace the washers and shim(s) 3 if out of specification.2. Check the commutator for dirt. Clean with #600 grid sandpaper and com- pressed air if necessary. 3. Measure the commutator diameter. Replace the armature if out of specifica- tion. Dial gauge 1 : YU-03097 Dial gauge set 1 : 90890-01252 Magnetic flexible stand 2 : YU-34481 Magnet base 2 : 90890-06705 Free play limit: 0.6 mm (0.024 in) Diameter limit: 31.0 mm (1.22 in)
62Y3A118-24 1 2 3 4 5 6 7 8 I 4. Measure the commutator undercut a . Replace the armature if out of specifica- tion. 5. Check the armature for continuity. Replace if out of specifications. Checking the brushes 1. Measure the brush length. Replace the brush assembly if out of specification.2. Check the brush holder for continuity. Replace if out of specifications. Checking the starter motor operation 1. Check the operation of the starter motor after installing it to the power unit. Commutator undercut limit: 0.2 mm (0.01 in) Armature continuity Commutator segments b Continuity Segment – Armature core c No continuity Segment – Armature shaft d No continuity Brush length limit a : 12.0 mm (0.47 in) Brush assembly continuity Brush 1 – Brush 2 Continuity Brush 1 – Brush 3 Brush 2 – Brush 3 Brush holder 4 – Brush assembly holder 5 No continuity Starter motor
ELECElectrical systems –+ 8-2562Y3A11 Charging system8 1Lighting coil 2Rectifier Regulator 3Fuse 4BatteryB: Black G: Green R: Red G/W : Green/white
62Y3A118-26 1 2 3 4 5 6 7 8 I Checking the lighting coil 1. Measure the lighting coil output peak voltage. Replace the stator coil if below specification. WARNING When checking the peak voltage do not touch any of the connections of the digital tester leads. NOTE: Use the peak voltage adaptor with the digi- tal circuit tester. When measuring the peak voltage, set the selector on the digital circuit tester to the DC voltage mode . Checking the Rectifier Regulator 1. Measure the Rectifier Regulator output peak voltage. If below specification, mea- sure the lighting coil output peak voltage. Replace the Rectifier Regulator if the out- put peak voltage of the lighting coil is above specification. WARNING When checking the peak voltage do not touch any of the connections of the digital tester leads. NOTE: Use the peak voltage adaptor with the digi- tal circuit tester. When measuring the peak voltage, set the selector on the digital circuit tester to the DC voltage mode . Digital multimeter: YU-34899-A Digital circuit tester: 90890-03174 Peak voltage adaptor: YU-39991 / 90890-03172 Test harness (3 pins): YB-06770 / 90890-06770 Lighting coil output peak voltage: Green (G) – Green (G) r/minUnloaded Cranking 1,500 3,500 DC V 11.9 42 127 Lighting coil resistance (use as reference): Green (G) – Green (G) 1.2–1.8 Ω at 20 °C (68 °F) Digital multimeter: YU-34899-A Digital circuit tester: 90890-03174 Peak voltage adaptor: YU-39991 / 90890-03172 Test harness (4 pins): YB-06771 / 90890-06771 Charging system
ELECElectrical systems –+ 8-2762Y3A11 NOTE: After starting the engine, disconnect the out- put lead (red lead) of the Rectifier Regulator when measuring the output peak voltage.Rectifier Regulator output peak voltage: Red (R) – Black (B) r/minUnloaded 1,500 3,500 DC V 18.9 19.5
Index i-162Y3A11 A. Acceleration pump .................................... 1-15 Adjusting the dash-pot (acceleration pump) ................................ 4-24 Adjusting the pilot screw ........................... 4-22 Adjusting the throttle link rod..................... 4-21 Adjusting the trim sensor .......................... 7-46 After test run ............................................. 1-36 Applicable models ....................................... 1-5 Assembling the carburetor ........................ 4-20 Assembling the cylinder body ................... 5-64 Assembling the drive shaft .............. 6-27 , 6-66 Assembling the forward gear .......... 6-27 , 6-65 Assembling the fuel pump......................... 4-10 Assembling the gear pump ....................... 7-66 Assembling the lower case ............. 6-25 , 6-63 Assembling the oil pan .............................. 7-39 Assembling the power trim and tilt motor .. 7-76 Assembling the propeller shaft assembly ....................................... 6-16 , 6-55 Assembling the propeller shaft housing ......................................... 6-16 , 6-55 Assembling the tiller handle ............ 7-15 , 7-23 Assembling the tilt cylinder ....................... 7-69 Assembling the trim cylinder ..................... 7-67 B. Backlash (F50/F50A) ................................ 6-39 Backlash (T50/FT50B, FT50C) ................. 6-77 Bleeding the power trim and tilt (built-in)... 7-71 Bleeding the power trim and tilt (not installed) .......................................... 7-70 Bottom cowling.......................................... 7-25 Break-in..................................................... 1-36 C. Carburetor ........................................1-10, 4-17 Carburetor unit .......................................... 4-11 CDI unit with microcomputer ....................... 1-7 Charging system ....................................... 8-25 Check the valves....................................... 7-65 Checking the anodes ................................ 3-19 Checking the armature.............................. 8-23 Checking the battery ....................... 1-33 , 3-20 Checking the bearings .................... 6-25 , 6-63 Checking the brushes ............................... 8-24 Checking the camshaft ............................. 5-45 Checking the carburetor............................ 4-19 Checking the CDI unit ............................... 8-15 Checking the charge coil........................... 8-15 Checking the compression pressure......... 5-25Checking the connecting rod big end side clearance ................................................ 5-59 Checking the connecting rod bolt ............. 5-59 Checking the connecting rod small end inside diameter ....................................... 5-59 Checking the cooling water passage ........ 3-13 Checking the crankshaft ........................... 5-59 Checking the crankshaft main journal oil clearance ................................................ 5-60 Checking the crankshaft pin oil clearance ................................................ 5-61 Checking the cylinder bore ....................... 5-56 Checking the cylinder head ...................... 5-46 Checking the diaphragm and valves ........ 4-10 Checking the drive shaft ..................6-25 , 6-63 Checking the electrical components ........... 8-4 Checking the engine idle speed ............... 3-15 Checking the engine oil .....................1-33 , 3-5 Checking the engine shut-off switch ......... 8-17 Checking the engine start switch .............. 8-17 Checking the engine start switch and engine stop switch/engine shut-off switch .......... 1-35 Checking the filters ................................... 7-65 Checking the fuel filter ................................ 3-5 Checking the fuel joint and fuel hoses (fuel joint-to-carburetor) ............................ 3-4 Checking the fuel pump .............................. 4-9 Checking the fuel system ......................... 1-33 Checking the fuse ............................7-79 , 8-20 Checking the gear oil ................................ 1-33 Checking the gear oil level ....................... 3-17 Checking the gear pump .......................... 7-66 Checking the gearshift and throttle operation..................................... 1-34 Checking the gearshift operation .............. 3-14 Checking the ignition coil .......................... 8-14 Checking the ignition spark gap ............... 8-13 Checking the ignition timing...................... 3-15 Checking the lighting coil .......................... 8-26 Checking the lower case .................6-25 , 6-63 Checking the lower unit (for air leakage) .. 3-19 Checking the neutral switch...................... 8-20 Checking the oil pressure ......................... 5-25 Checking the oil pressure switch .............. 8-18 Checking the oil pump .............................. 5-47 Checking the oil strainer and the relief valve .............................................. 7-39 Checking the outboard motor mounting position ................................................... 1-34 Checking the pilot water outlet ................. 1-35 Checking the pinion and forward gear ..................................6-25 , 6-63 Checking the piston clearance ................. 5-57