Yamaha YQ50 Service Manual page 97

ENGINE ASSEMBLY AND ADJUSTMENT
PISTON, CYLINDER AND CYLINDER HEAD
Q Carburetor joint
W Reed valve
E Gasket
R Cylinder head
T Cylinder head gasket
Y Cylinder
A Piston clearance:
0.029 ~ 0.042 mm
B Piston rings end gap:
0.15 ~ 0.35 mm
C Piston rings side clearance:
0.03 ~ 0.05 mm
D Spark plug:
Type: BR8HS
Manufacturer: NGK
16 Nm (1.6 m.kg)
LT
20 Nm (2.0 m.kg)
U Cylinder gasket
I Piston ring
O Piston
P Piston pin
{ Piston pin clip
} Bearing
4 Nm (0.4 m.kg)
14 Nm (1.4 m.kg)
11 Nm (1.1 m.kg)
4-36
ENG