YG125-30A Maintenance Manual
Cylinder Head, Cylinder and Piston
60
The spark plug must be tightened to the specified tightening torque of
15
～
20N.m
for fear of leak.
While mounting the intake / exhaust valve, coat the mixture of engine oil and molybdenum disulfide on valve stem for
preliminary lubrication.
While mounting the stud, please use specified thread retaining adhesive.
While mounting the valve spring, let the sparse end face up.
Notice:
Do not damage the oil shield lip while mounting.
The valve lock clamp must be mounted in place; dropout of the valve lock clamp is dangerous.
No.
Procedure
Quantity
Remarks
1
1
2
Cylinder head gasket
1
Coat the mixture of engine oil and molybdenum disulfide
on the stem while assembling
3
Cylinder body gasket
1
Coat the mixture of engine oil and molybdenum disulfide
on the stem while assembling
4
Dowel Pin
2
5
cylinder head
1
Assemble with sparse end facing up
6
spark plug
1
Assemble with sparse end facing up
7
Gas CAM shaft seat
1
Assemble with sparse end facing up
8
Bolt M6*105
2
Replace it with a new one as required
9
Cylinder head nut
4
10
flat washer
4
Replace it with a new one as required Tightening torque
18-25N.m.
11
flat washer
2
Use thread retaining adhesive while assembling
Tightening torque 8-12N.m.
12
Muffler double head bolts
2
13
Gas CAM shaft baffle
1
14
Bolt M6*16
1
15
rectangular seals
1
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