Yamaha F25 - Power Unit

1-21
SPEC
Specification
Power unit
Part to be tightened Screw size
Tightening torques
N·mkgf·mft·lb
Oil pressure switch — 80.85.9
Pulser coil bolt M5 4 0.4 3.0
Adjusting screw locknut — 14 1.4 10.3
Drive plate screw ø5 5.4 0.54 3.98
Cover screw ø4 1.5 0.15 1.11
Sheave drum screw ø5 3.4 0.34 2.51
PTT relay cover screw ø53 0.32.2
Power unit mounting bolt
1st
M8
21 2.1 15.5
2nd 21 2.1 15.5
Apron screw M4 2 0.2 1.5
Drive sprocket nut — 150 15.0 110.6
Driven sprocket bolt M6 38 3.8 28.0
Flywheel magnet nut — 157 15.7 115.8
PTT relay lead nut — 50.53.7
Starter motor bolt M6 29 2.9 21.4
Cylinder head bolt
1st
M9
12 1.2 8.9
2nd 23 2.3 17.0
3rd 90°
Cylinder head bolt
1st
M6
60.64.4
2nd 12 1.2 8.9
Spark plug — 17 1.7 12.5
Rocker arm shaft bolt M8 18 1.8 13.3
Cylinder head anode plug — 18 1.8 13.3
Cylinder head anode screw M5 2 0.2 1.5
Thermo sensor — 23 2.3 17.0
Oil pressure switch bolt M4 2 0.2 1.5
Exhaust cover plug M18 55 5.5 40.6
Exhaust cover anode plug — 18 1.8 13.3
Exhaust cover anode screw M5 2 0.2 1.5
Exhaust cover plug M14 23 2.3 17.0
Oil filter — 18 1.8 13.3
Oil filter union bolt — 40 4.0 29.5
Exhaust cover bolt
1st
M8
60.64.4
2nd 12 1.2 8.9
Thermostat cover bolt
1st
M8
60.64.4
2nd 12 1.2 8.9
Balancer piston nut — 157 15.7 115.8
Connecting rod bolt
1st
M6
60.64.4
2nd 17 1.7 12.5
Crankcase bolt
1st
M8
15 1.5 11.1
2nd 30 3.0 22.1
Crankcase bolt
1st
M6
60.64.4
2nd 12 1.2 8.9
Crankcase cover bolt M6 12 1.2 8.9