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Outboard Motor
FT50C
Yamaha FT50C User Manual
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BRKT
Bracket unit
7-49
62Y5A11
Checking the trailer switch
1.
Check the trailer switch for continuity.
Replace if out of specification.
Checking the trim sensor
1.
Measure the trim sensor resistance.
Replace if out of specification.
NOTE:
Turn the lever
1
and measure the resistance
as it gradually changes.
Lead color
Switch
positi
on
Sky blue
(Sb)
Red (R)
Light g
reen
(Lg)
Up
Free
Down
Trim sensor resistance:
Pink (P)
–
Black (B)
10
–
288.3
Ω
at 20
°
C (68
°
F)
217
219
Table of Contents
1 General Information
3
Default Chapter
2
Important Information
2
Table of Contents
3
General Information
4
How to Use this Manual
6
Manual Format
6
Symbols
7
Safety While Working
8
Fire Prevention
8
Ventilation
8
Self-Protection
8
Parts, Lubricants, and Sealants
8
Good Working Practices
9
Disassembly and Assembly
9
Identification
9
Applicable Models
9
Serial Number
9
Features and Benefits
10
Use of Leaded Gasoline
10
Newly Designed Four Carburetors
10
CDI Unit with Microcomputer
11
Lower Unit
12
Technical Tips
13
Carburetor
13
Acceleration Pump
18
Ignition System
20
Ignition Timing Control
22
Power Trim and Tilt
24
Predelivery Checks
31
Checking the Fuel System
31
Checking the Gear Oil
32
Checking the Engine Oil
32
Checking the Battery
32
Checking the Outboard Motor Mounting Position
32
Checking the Remote Control Cables
32
Checking the Steering System
33
Checking the Gearshift and Throttle Operation
33
Checking the Tilt System
33
Checking the Engine Start Switch and Engine Stop Switch/Engine Shut-Off Switch
34
Checking the Pilot Water Outlet
34
Test Run
34
Break-In
34
After Test Run
34
Propeller Selection
31
Propeller Size
31
Selection
31
Spec Specifications
35
Specifications
35
General Specifications
36
Maintenance Specifications
38
Power Unit
38
Lower Unit
41
Electrical
41
Chk Adj/Chk Adj
51
Chk Adj
52
Special Service Tools
52
Periodic Checks and Adjustments
52
Maintenance Interval Chart
53
Top Cowling
54
Checking the Top Cowling
54
Fuel System
54
Checking the Fuel Joint and Fuel Hoses (Fuel Joint-To-Carburetor)
54
Checking the Fuel Filter
54
Power Unit
55
Checking the Engine Oil
55
Replacing the Engine Oil
55
Checking the Timing Belt
56
Checking the Valve Clearance
56
Checking the Spark Plugs
58
Checking the Thermostat
59
Checking the Cooling Water Passage
59
Control System
60
Checking the Throttle Cable Operation
60
Checking the Gearshift Operation
60
Checking the Engine Idle Speed
61
Checking the Ignition Timing
62
Power Trim and Tilt Unit
62
Checking the Power Trim and Tilt Operation
62
Checking the Power Trim and Tilt Fluid Level
63
Lower Unit
63
Checking the Gear Oil Level
63
Chk Adj
64
Replacing the Gear Oil
64
Checking the Lower Unit (for Air Leakage)
65
Checking the Propeller
65
General
65
Checking the Anodes
65
Checking the Battery
66
Lubrication
67
Fuel Fuel System
69
Fuel
69
Special Service Tools
70
Fuel System
70
Hose Routing
71
Fuel and Blowby Hoses
71
Fuel Filter and Fuel Pump
72
Checking the Fuel Pump
74
Disassembling the Fuel Pump
74
Checking the Diaphragm and Valves
75
Assembling the Fuel Pump
75
Carburetor Unit
76
Carburetor
78
Checking the Carburetor
80
Checking the Prime Start
81
Assembling the Carburetor
81
Adjusting the Throttle Link Rod
82
Adjusting the Pilot Screw
82
Synchronizing the Carburetors
83
Adjusting the Dash-Pot (Acceleration Pump)
84
Powr Power Unit
86
Powr
86
Special Service Tools
88
Power Unit
90
Checking the Compression Pressure
100
Checking the Oil Pressure
100
Removing the Power Unit
100
Timing Belt and Sprockets
103
Removing the Timing Belt and Sprockets
104
Checking the Timing Belt and Sprockets
105
Installing the Sprockets and Timing Belt
105
Cylinder Head
108
Removing the Cylinder Head
111
Checking the Valve Springs
112
Checking the Valves
112
Checking the Valve Guides
113
Replacing the Valve Guides
113
Checking the Valve Seat
114
Refacing the Valve Seat
115
Checking the Rocker Arms and Rocker Arm Shaft
117
Checking the Camshaft
117
Checking the Cylinder Head
118
Checking the Oil Pump
118
Installing the Valves
119
Installing the Camshaft
120
Installing the Rocker Arm Assembly
120
Installing the Cylinder Head
121
Cylinder Body
122
Removing and Installing the Oil Filter
124
Disassembling the Cylinder Body
124
Checking the Piston Diameter
125
Checking the Cylinder Bore
125
Checking the Piston Clearance
126
Checking the Piston Rings
126
Checking the Piston Ring Grooves
127
Checking the Piston Ring Side Clearance
127
Checking the Piston Pin Boss Bore
127
Checking the Piston Pin
127
Checking the Connecting Rod Small End Inside Diameter
128
Checking the Connecting Rod Big End Side Clearance
128
Checking the Connecting Rod Bolt
128
Checking the Crankshaft
128
Checking the Crankshaft Main Journal Oil Clearance
129
Checking the Crankshaft Pin Oil Clearance
130
Selecting the Crankshaft Main Journal Bearing
132
Selecting the Connecting Rod Big End Bearing
132
Assembling the Cylinder Body
133
Installing the Power Unit
136
Lowr Lower Unit
139
Lowr
139
Lower Unit
140
Special Service Tools
140
Lower Unit
142
Removing the Lower Unit
145
Water Pump and Shift Rod
146
Removing the Water Pump and Shift Rod
148
Checking the Water Pump and Shift Rod
148
Installing the Water Pump and Shift Rod
148
Propeller Shaft Housing
150
Removing the Propeller Shaft Housing Assembly
152
Disassembling the Propeller Shaft Housing
152
Disassembling the Propeller Shaft Assembly
153
Checking the Propeller Shaft Housing
153
Checking the Propeller Shaft
153
Assembling the Propeller Shaft Assembly
154
Assembling the Propeller Shaft Housing
154
Installing the Propeller Shaft Housing
155
Drive Shaft and Lower Case
156
Removing the Drive Shaft
158
Disassembling the Drive Shaft
158
Disassembling the Forward Gear
158
Disassembling the Lower Case
159
Checking the Pinion and Forward Gear
159
Checking the Bearings
159
Checking the Drive Shaft
159
Checking the Lower Case
160
Assembling the Lower Case
160
Assembling the Forward Gear
160
Assembling the Drive Shaft
161
Installing the Pinion
161
Installing the Lower Unit
161
Shimming
163
Selecting the Pinion Shims
164
Selecting the Forward Gear Shims
165
Backlash
166
Selecting the Reverse Gear Shims
166
Measuring the Forward Gear Backlash
166
Brkt Bracket Unit
168
Brkt
168
Special Service Tools
170
Tiller Handle
171
Bottom Cowling
176
Checking the Throttle Cable and Shift Rod
178
Assembling the Tiller Handle
178
Lubricating the Throttle Gear
179
Checking the Shift Rod Assembly Operation
179
Upper Case
180
Disassembling the Oil Pan
184
Checking the Oil Strainer and the Relief Valve
184
Assembling the Oil Pan
184
Installing the Upper Case
186
Clamp Brackets
187
Removing the Clamp Brackets
188
Installing the Clamp Brackets
188
Adjusting the Trim Sensor
189
Swivel Bracket and Steering Arm
190
Removing the Steering Arm
192
Installing the Steering Arm
192
Power Trim and Tilt Unit
194
Removing the Power Trim and Tilt/Hydro Tilt
195
Tilt Cylinder and Trim Cylinder
196
Trim Cylinder
198
Gear Pump
200
Disassembling the Tilt Cylinder
204
Disassembling the Trim Cylinder
204
Disassembling the Gear Pump
204
Checking the Tilt Cylinder and Trim Cylinder
205
Check the Valves
205
Checking the Filters
206
Checking the Gear Pump
206
Assembling the Gear Pump
206
Assembling the Trim Cylinder
207
Assembling the Tilt Cylinder
209
Bleeding the Power Trim and Tilt (Not Installed)
210
Bleeding the Power Trim and Tilt (Built-In)
211
Power Trim and Tilt Motor
212
Checking the Power Trim and Tilt Motor
213
Assembling the Power Trim and Tilt Motor
214
Installing the Power Trim and Tilt
214
Power Trim and Tilt Electrical System
216
Checking the Fuse
217
Checking the Power Trim and Tilt Relay
217
Checking the Trailer Switch
218
Checking the Trim Sensor
218
Elec Electrical Systems
219
Elec
219
Electrical Systems
220
Special Service Tools
220
Checking the Electrical Components
221
Measuring the Peak Voltage
221
Measuring the Lower Resistance
221
Electrical Components
222
Starboard and Port Views
222
Front View
223
Top View
224
Tiller Handle Model
225
Wiring Harness
226
Ignition System and Ignition Control System
227
Checking the Ignition Spark Gap
229
Checking the Spark Plug Caps
229
Checking the Ignition Coil
230
Checking the CDI Unit
230
Checking the Charge Coil
230
Checking the Pulser Coil
231
Checking the Pulser Coil Air Gap
232
Checking the Engine Start Switch
232
Checking the Engine Shut-Off Switch
232
Checking the Thermoswitch
233
Checking the Oil Pressure Switch
233
Starting System
234
Checking the Fuse
235
Checking the Wiring Harness (10 Pins)
235
Checking the Neutral Switch
235
Checking the Starter Relay
235
Starter Motor
236
Removing the Starter Motor Pinion
238
Checking the Starter Motor Pinion
238
Checking the Armature
238
Checking the Brushes
239
Checking the Starter Motor Operation
239
Charging System
240
Checking the Lighting Coil
241
Checking the Rectifier Regulator
242
Trbl Shtg
243
4
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Yamaha FT50C Specifications
General
Brand
Yamaha
Model
FT50C
Category
Outboard Motor
Language
English
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