Yamaha F50 Service Manual

62Y3A112-28
1
2
3
4
5
6
7
8
I
Clamp bracket
Symbol UnitModel
USA T50TR———
Canada T50TR———
Worldwide FT50BET FT50CEHD FT50CED FT50CET
B1 mm (in) 126 (5.0)
B2 mm (in) 254 (10.0)
B3 mm (in) 163.5 (6.4)
B4 mm (in) 50.8 (2.0)
B5 mm (in) 180 (7.1)
B6 mm (in) 355 (14.0)
B7 mm (in)—
B8 mm (in) 139 (5.5)
B9 mm (in) 18.5 (0.7)
C2 mm (in)—
C3 mm (in) 69 (2.7)
D1 mm (in) 13 (0.5)
D2 mm (in) 55.5 (2.2)
Maintenance specifications 

SPECSpecifications
2-2962Y3A11
Tightening torques2
Specified torques
Part to be tightened Thread sizeTightening torques
N·mkgf·mft·lb
Power unit
Flywheel magnet nut—160 16 116
Stator base screw M6 4 0.4 2.9
Cover screw M6 3 0.3 2.2
Negative battery lead bolt M8 9 0.9 6.5
Positive battery lead nut—70.75.1
Oil pressure switch—90.96.5
Oil pressure switch lead screw—20.21.4
Ignition coil bolt M6 7 0.7 5.1
Starter motor bolt M8 30 3.0 22
Starter motor terminal nut—70.75.1
Power unit bolt M8 21 2.1 15...

62Y3A112-30
1
2
3
4
5
6
7
8
I
Lower unit (T50/FT50B, FT50C)
Check screw—70.75.1
Lower unit bolt M10 40 4.0 29
Drain screw—70.75.1
Propeller nut—35 3.5 25
Ring nut—105 10.5 76
Water inlet cover screw—50.53.6
Pinion nut M22 95 9.5 69
Bracket unit
Tiller handle assembly nut (F50/F50A)—37 3.7 27
Engine shut-off switch nut (F50/F50A)—40.42.9
Tiller handle bracket nut (F50/F50A)—38 3.8 27
Main switch nut (F50/F50A)—50.53.7
Friction wing nut (FT50C)—13 1.3 9.4
Tiller handle assembly nut (FT50C)—37 3.7 27...

SPECSpecifications
2-3162Y3A11
General torques
This chart specifies tightening torques for
standard fasteners with a standard ISO
thread pitch. Tightening torque specifications
for special components or assemblies are
provided in applicable sections of this man-
ual. To avoid warpage, tighten multi-fastener
assemblies in a crisscross fashion and pro-
gressive stages until the specified torque is
reached. Unless otherwise specified, torque
specifications require clean, dry threads. 
Components should be...

62Y3A11
CHK 
ADJ
1
2
3
4
5
6
7
8
I
Periodic checks and adjustments
Special service tools ..................................................................................... 3-1
Maintenance interval chart ............................................................................ 3-3
Top cowling .................................................................................................... 3-4
Checking the top cowling........................................................................... 3-4...

CHK 
ADJ
Periodic checks and adjustments
3-162Y3A11
Special service tools3
Oil filter wrench
YU-38411
Flywheel magnet holder
YB-06139
Universal puller
YB-06117
Inductive self-powered tachometer
YU-08036-B
Battery powered timing light
YM-33277-APressurfge/vacuum tester
YB-35956-A
Oil filter wrench
90890-01426
Flywheel holder
90890-06522
Flywheel puller
90890-06521
Digital tachometer
90890-06760
For USA and Canada
For worldwide 

62Y3A113-2
1
2
3
4
5
6
7
8
I
Timing light
90890-03141
Leakage tester
90890-06762
Special service tools 

CHK 
ADJ
Periodic checks and adjustments
3-362Y3A11
Maintenance interval chart3
Use the following chart as a guideline for general maintenance.
Adjust the maintenance intervals according to the operating conditions of the outboard.
NOTE:
If operating in salt water, turbid or muddy water, flush the engine with fresh water after each use.
If leaded gasoline is used regularly, check the engine valves and related parts every 300 hours of
operation in addition to the items in the maintenance interval...

62Y3A113-4
1
2
3
4
5
6
7
8
I
Top cowling3
Checking the top cowling
1. Check the fitting by pushing the cowling
with both hands. Adjust if necessary.
2. Loosen the nuts and bolts 1
.
3. Move the hook 2
 up or down slightly to
adjust its position.
NOTE:
To loosen the fitting, move the hook toward
the seal.
To tighten the fitting, move the hook away
from the seal.
4. Tighten the nuts and bolts.
5. Check the fitting again and, if necessary,
repeat steps 2–4.
Fuel system3
Checking the fuel joint and fuel...

CHK 
ADJ
Periodic checks and adjustments
3-562Y3A11
Checking the fuel filter
1. Check the fuel filter element 1
 for dirt
and residue and check the fuel filter cup
2
 for foreign substances and cracks.
Clean with straight gasoline and replace
the cup if necessary.
ÈF50/F50A
ÉT50/FT50B, FT50C
NOTE:
Be sure not to spill any fuel when removing
the fuel filter cup.
Power unit3
Checking the engine oil
1. Place the outboard in an upright position.
2. Remove the engine oil dipstick, wipe it
clean, and then...