Yamaha YZ125 2019 Owner's Service Manual page 113

INSTALLING THE CYLINDER HEAD AND
CYLINDER
1. Apply:
• Engine oil
To piston "1", piston ring "2" and cylinder
surface.
2. Install:
• Cylinder "1"
Make sure the piston ring is properly posi-
tioned. Install the cylinder with one hand
while compressing the piston ring with the
other hand.
After installing, check the smooth movement of
the piston.
CYLINDER HEAD, CYLINDER AND PISTON
3. Install:
• Nut (cylinder) "1"
Tighten the nuts in stage, using a crisscross
pattern.
4. Install:
• Collar "1"
• Push rod "2"
• Plain washer "3"
• Bolt (push rod) "4"
• Set the collar "5" included in owner's tool kit to
install the bolt (push rod).
• Do not forget to remove the collar.
4-26
Nut (cylinder):
30 Nm (3.0 m•kg, 22 ft•lb)
Bolt (push rod):
5 Nm (0.5 m•kg, 3.6 ft•lb)