Yamaha 150A - Tightening Torques

2-18
SPEC
E
TIGHTENING TORQUES
TIGHTENING TORQUES 2
SPECIFIED TORQUES
Part to be tightened Thread size
Tightening torques
Nm m•kgf ft•lb
POWER UNIT
Fuel pump M5 3 0.3 2.2
Intake silencer M6 3 0.3 2.2
Carburetor drain plug — 5 0.5 3.6
Pilot jet plug — 3 0.3 2.2
Oil pump M6 7 0.7 5.1
Flywheel magnet assembly
(oil injection and 225DET)
M20 190 19 137
Flywheel magnet assembly
(pre-mix except for 225DET)
M20 165 16.5 120
Negative battery lead M8 7 0.7 5.1
Positive battery lead M6 4 0.4 2.9
Power unit mount M8 21 2.1 15
Ignition coil M6 8 0.8 5.8
Emergency switch — 4 0.4 2.9
Starter motor lead M6 9 0.9 6.5
Relay assembly lead M6 4 0.4 2.9
Starter motor M8 30 3.0 22
Intake manifold
1st
M6
4 0.4 2.9
2nd 8 0.8 5.8
Reed valve M5 3 0.3 2.2
Reed valve stopper M3 1 0.1 0.7
Spark plug M14 25 2.5 18
Thermostat cover
1st
M6
4 0.4 2.9
2nd 8 0.8 5.8
Cylinder head cover
1st
M6
4 0.4 2.9
2nd 8 0.8 5.8
Cylinder head
1st
M8
15 1.5 11
2nd 30 3.0 22
Engine cooling water temperature
sensor
— 18 1.8 13
Cooling water pressure
control valve cover
1st
M6
4 0.4 2.9
2nd 8 0.8 5.8
Exhaust port outer cover
1st
M6
4 0.4 2.9
2nd 8 0.8 5.8
Crankcase
1st
M8
10 1.0 7.2
2nd 18 1.8 13
1st
M10
20 2.0 14
2nd 40 4.0 29