Part II Repair Instructions
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2-4 Torque parameters of fasteners
(1) Torque parameters of parts
No. Process Description Bolt Specification
Torque Range
N.m In.lb.
1 Oil drain Connector Oil drain Connector 18~23 159.3~203.5
2 Spark Plug M14×1 25~30 221.2~265.3
3 Connecting Rod Cover Six Hexagonal Flange Bolt M6×35 11~13 97.4~115
4 Crankcase Cover Bolt Six Hexagonal Flange Bolt M8×45 24~32 212.4~283.2
5 Fuel Pump Assy. Six Hexagonal Flange Bolt M6×25 6~9 53.1~79.6
6 Breather Valve Assy. Six Hexagonal Flange Bolt M6×16 8~12 70.8~106.2
7 Cylinder Head
Six Hexagonal Flange Bolt M10×1.25×70
50~55 442.5~486.7
Six Hexagonal Flange Bolt M10×1.25×50
8 Push Rod Location Limit Plate Valve Adjust Stud 28~32 247.8~283.2
9 Valve Lash Inspection（Q1） Valve Lock Nut M6 12~16 106.2~141.6
10 Flywheel Six Hexagonal Flange Bolt M12×35 90~115 796.5~1017
11 Ignition Coil Six Hexagonal Flange Bolt M6×25 8~12 70.8~106.2
12 Electric Starter Motor Six Hexagonal Flange Bolt M8×30 22~30 194.7~265.5
13 Inlet Pipe
Six Hexagonal Flange Bolt M6×35 8~12 70.8~106.2
Stud Bolt M6×106 6~8 53.1~70.8
14 Shroud Comp Hexagonal Flange Step Bolt 6×16.8-8×5.8 8~12 70.8~106.2
21 Charging Coil Screw Inner Six Angle M6×25 8~12 70.8~106.2
23 Breather Valve Cover Six Hexagonal Flange Bolt M6×16 8~12 70.8~106.2
24 Ignition Coil Six Hexagonal Flange Bolt M6×25 8~12 70.8~106.2
25 Regulater Six Hexagonal Flange Bolt M6×16 6~8 53.1~70.8
27 Oil Pump Cover Six Hexagonal Flange Bolt M6×16 8~12 70.8~106.2
28 Oil Screen Cover Six Hexagonal Flange Bolt M6×16 8~12 70.8~106.2
29 Oil Tube Plate Six Hexagonal Flange Bolt M6×16 8~12 70.8~106.2
31 Governor Arm Nut M6 8~12 70.8~106.2
33 Connector, Oil Filter M20 40~45 354~398.2
34 Cylinder Head
Stud Bolt M8×34 12~16 106.2~141.6
Nut M8 15~18 132.7~159.3
35 Oil Filter / 9~13 79.6~115
36 Carburetor Solenoid Valve M12 9~11 79.6~97.4
Note: for unspecified bolts and nuts in the above mentioned table, please refer to standard torques.
(2) Standard torque parameters
Fastening Parts
Bolt Specification
Torque (N.m)
Bolt and nut
5 mm Bolt and nut 4-7
6 mm Bolt and nut 8-12
8 mm Bolt and nut 20-28
10 mm Bolt and nut 35-40
12 mm Bolt and nut 50-60
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