Engine Inspection and Maintenance 
Table of tightening torque for fastening parts used in Engine   
Fastening position and part name 
Tightening torque(N·m) 
Cylinder cap nut M8 
Cylinder cap nut M6 
Cylinder cap bolt 
Cylinder block connecting bend bolt 
Cylinder block connecting nut 
Flywheel locknut 
Valve clearance adjuster 
Gearshift changeover contact screw 
Closing bolt 
Right side cover bolt 
Front left cover bolt 
Coil screw 
Clutch separating disc bolt 
Clutch locknut 
Filter screen cover bolt 
Tensioner pinch bolt 
Drive gear locknut 
Drive sprocket bolt 
Engine oil pump screw 
Ratchet upper and lower baffler screw 
Spark plug 
25~28 
8~12 
8~12 
8~12 
8~12 
50~55 
10~15 
8~12 
8~12 
8~12 
8~12 
8~12 
6~8 
45~50 
8~12 
8~12 
50~60 
18~22 
8~12 
8~12 
18~22 
Components that cannot be reused: 
Please be sure to use new paper pad, sealing ring, O ring, cotter pin, circlip, retainer and so on while 
installing or assembling components.