Installing The Cylinder Head - Yamaha YZ125 2022 Owner's Service Manual

7. Remove:
• Collar
8. Install:
• Gasket (power valve housing)
• Power valve housing "1"
• Power valve housing bolt "2"
Power valve housing bolt
4.0 N·m (0.40 kgf·m, 3.0 lb·ft)
EAM30555

INSTALLING THE CYLINDER HEAD

1. Lubricate:
• O-ring
Recommended lubricant
Lithium-soap-based grease
2. Install:
• O-ring "1"
New
• Dowel pin
TIP
Apply the lithium-soap-based grease on the O-
rings.
CYLINDER HEAD, CYLINDER AND PISTON
3. Install:
• Cylinder head "1"
• Copper washer "2"
New
• Cylinder head nut "3"
TIP
Tighten the cylinder head nut in stage, using a
crisscross pattern.
4. Install:
• Spark plug
• Spark plug cap
• Radiator hose
5-15
New
Cylinder head nut
28 N·m (2.8 kgf·m, 21 lb·ft)
Spark plug
20 N·m (2.0 kgf·m, 15 lb·ft)
1