Yamaha F4B Service Manual

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Specified tightening torque
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Specified tightening torque
Fuel system
Power unit
Lower unit
Part to be tightened Screw size
Tightening torques
N·m kgf·m ft·lb
Choke cable nut — 4 0.4 3.0
Choke holder bolt M5 4 0.4 3.0
Fuel cock screw M6 7 0.7 5.2
Intake manifold bolt M6 12 1.2 8.9
Throttle cable locknut — 4 0.4 3.0
Throttle link screw M4 1.5 0.15 1.11
Fuel pump valve screw M3 0.5 0.05 0.37
Fuel pump screw M4 2 0.2 1.5
Fuel pump bolt M6 7 0.7 5.2
Part to be tightened Screw size
Tightening torques
N·m kgf·m ft·lb
CDI unit bolt M6 10 1.0 7.4
Valve adjusting locknut — 10 1.0 7.4
Drive plate screw — 7 0.7 5.2
Start-in-gear protection cable locknut — 2 0.2 1.5
Flywheel magnet nut — 60 6.0 44.3
Engine shut-off switch nut — 2 0.2 1.5
Power unit mounting bolt M6 12 1.2 8.9
Crankcase bolt
1st
M6
50.53.7
2nd 11 1.1 8.1
Blind plug M8 20 2.0 14.8
Pivot bolt — 10 1.0 7.4
Cylinder head bolt
1st
M8
13 1.3 9.6
2nd 28 2.8 20.7
Thermostat cover anode screw M5 2 0.2 1.5
Spark plug — 13 1.3 9.6
Connecting rod cap bolt
1st
M7
60.64.4
2nd 12 1.2 8.9
Breather plate screw M5 8 0.8 5.9
Part to be tightened Screw size
Tightening torques
N·m kgf·m ft·lb
Drain screw — 9 0.9 6.6
Flushing screw — 9 0.9 6.6
Lower case mounting bolt (S-transom model) M6 11 1.1 8.1
Lower case mounting bolt (L-transom model) M6 15 1.5 11.1
Shift joint bolt M6 16 1.6 11.8
Check screw — 9 0.9 6.6
Power unit technical data / Lower unit technical data / Specified tightening torque

Yamaha F4B Specifications

General

Brand	Yamaha
Model	F4B
Category	Outboard Motor
Language	English