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F2.5A
Yamaha F2.5A Service Manual
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F2.5A
SER
VICE MANU
AL
69M-28197-3E-11
290470
2
Table of Contents
1 General Information
3
Important Information
2
Table of Contents
3
General Information
5
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
10
Applicable Model
10
Serial Number
10
Features and Benefits
11
Ignition System
11
Blowby Gas Reburning System
12
Oil Check Window
13
Idle Silencer
14
Splash Lubrication System
15
Low Vibration Tiller Handle
16
Technical Tips
17
TCI System
17
Automatic Tilt Support and Steering Pivot Immobilization System
18
Cooling Water Flow Chart
19
Propeller Selection
20
Propeller Size
20
Selection
20
Predelivery Checks
20
Checking the Fuel System
20
Checking the Gear Oil
20
Checking the Engine Oil
21
Checking the Outboard Motor Mounting Height
21
Checking the Steering System
21
Checking the Gear Shift and Throttle Operation
22
Checking the Engine Shut-Off Switch
22
Checking the Cooling Water Pilot Hole
22
Test Run
23
Break-In
23
After Test Run
23
Adjusting the Engine Idle Speed
23
Spec Specifications
25
Default Chapter
25
Specifications
25
General Specifications
26
Maintenance Specifications
28
Power Unit
28
Electrical
30
Dimensions
31
Tightening Torques
33
Specified Torques
33
General Torques
34
Chk Adj/Chk Adj
35
Periodic Checks and Adjustments
36
Special Service Tools
36
Chk Adj
36
Maintenance Interval Chart
37
Fuel System
38
Checking the Fuel Line
38
Checking the Fuel Filter
38
Power Unit
38
Checking the Engine Oil
38
Changing the Engine Oil
39
Checking the Valve Clearance
39
Checking the Spark Plug
40
Checking the Thermostat
41
Checking the Cooling Water Passage
42
Control System
42
Checking the Engine Idle Speed
42
Checking the Ignition Timing
43
Chk Adj
44
Checking the TCI Unit Air Gap
44
Lower Unit
44
Checking the Gear Oil Level
44
Changing the Gear Oil
45
Checking the Lower Unit for Air Leakage
46
Checking the Propeller
46
General
46
Checking the Anodes
46
Lubricating the Outboard Motor
47
Fuel Fuel System
49
Default Chapter
49
Fuel
49
Special Service Tools
50
Fuel System
50
Hose Routing
51
Fuel and Blowby Hoses
51
Fuel Tank
52
Carburetor and Intake Silencer
53
Carburetor
54
Draining the Fuel
56
Checking the Fuel Tank and Fuel Filler Cap
56
Checking the Fuel Filter
56
Checking the Fuel Cock
56
Checking the Carburetor
56
Assembling the Carburetor
58
Installing the Carburetor
58
Installing the Throttle Cable
59
Adjusting the Pilot Screw
59
Powr Power Unit
61
Default Chapter
61
Powr
61
Special Service Tools
62
Power Unit
62
Power Unit
64
Checking the Compression Pressure
68
Disassembling the Manual Starter
68
Checking the Spiral Spring
69
Assembling the Manual Starter
69
Removing the Power Unit
71
Cylinder Head
73
Removing the Cylinder Head
75
Checking the Rocker Arms
76
Checking the Push Rod Guide
76
Checking the Push Rods
76
Checking the Valve Springs
76
Checking the Valves
77
Checking the Valve Guides
77
Replacing the Valve Guides
78
Checking the Valve Seat
79
Refacing the Valve Seat
79
Checking the Cylinder Head
81
Installing the Valves
82
Cylinder Block
83
Disassembling the Cylinder Body
85
Checking the Piston Diameter
85
Checking the Cylinder Bore
86
Checking the Piston Clearance
86
Checking the Piston Rings
86
Checking the Piston Ring Grooves
87
Checking the Piston Ring Side Clearance
87
Checking the Piston Pin Boss Bore
87
Checking the Piston Pin
88
Checking the Connecting Rod Small End Inside Diameter
88
Checking the Connecting Rod Big End Side Clearance
88
Checking the Crankshaft
88
Checking the Crankpin Oil Clearance
89
Checking the Camshaft
90
Checking the Valve Lifters
91
Checking the Oil Splasher Gear
91
Disassembling the Cylinder Block
91
Assembling the Cylinder Block
92
Disassembling the Crankcase
92
Checking the Oil Seal Housing
93
Assembling the Crankcase
93
Assembling the Piston and Cylinder Block
94
Installing the Power Unit
97
Lowr Lower Unit
99
Default Chapter
99
Lowr
99
Special Service Tools
100
Lower Unit
100
Lower Unit
101
Removing the Lower Unit
104
Removing the Water Pump and Shift Rod
104
Checking the Water Pump and Shift Rod
105
Propeller Shaft Housing
106
Removing the Propeller Shaft Housing Assembly
107
Disassembling the Propeller Shaft Assembly
107
Disassembling the Propeller Shaft Housing
107
Checking the Propeller Shaft Housing
107
Checking the Propeller Shaft
108
Assembling the Propeller Shaft Assembly
108
Assembling the Propeller Shaft Housing
108
Drive Shaft and Lower Case
109
Removing the Drive Shaft
110
Disassembling the Lower Case
110
Checking the Pinion and Forward Gear
111
Checking the Drive Shaft
111
Checking the Lower Case
111
Assembling the Lower Case
111
Installing the Drive Shaft
112
Installing the Propeller Shaft Housing
113
Installing the Water Pump and Shift Rod
113
Installing the Lower Unit
114
Brkt Bracket Unit
117
Bracket Unit
117
Brkt
117
Tiller Handle
118
Assembling the Tiller Handle
120
Installing the Tiller Handle
120
Upper Case, Swivel Bracket, and Clamp Brackets
123
Assembling the Swivel Bracket
125
Assembling the Clamp Brackets
126
Installing the Upper Case
126
Elec Electrical Systems
127
Electrical Systems
127
Elec
127
Special Service Tools
128
Electrical Components
129
Top View
129
Wiring Harness
130
Ignition System
131
Checking the Ignition Spark Gap
131
Checking the Spark Plug Cap
131
Checking the TCI Unit
132
Checking the Engine Shut-Off Switch
132
Trbl Shtg
133
Troubleshooting
133
Other manuals for Yamaha F2.5A
Owner's Manual
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Yamaha F2.5A Specifications
General
Max Power Output
2.5 HP
Fuel Induction System
Carburetor
Gear Ratio
2.08:1
Starting System
Manual
Shaft Length
381mm (15")
Gear Shift
Forward-Neutral
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