Yamaha YZ 2019 Series, Owner'S Service Manual

Page: 242 / 398

CLUTCH
5-43
EAM30112
CHECKING THE CLUTCH HOUSING
1. Check:
• Clutch housing dogs “a”
Damage/pitting/wear

Deburr the clutch
housing dogs or replace the clutch housing.
TIP
Pitting on the clutch housing dogs will cause er-
ratic clutch operation.
EAM30113
CHECKING THE CLUTCH BOSS
1. Check:
•
Clutch boss splines
Damage/pitting/wear

Replace the clutch
boss.
TIP
Pitting on the clutch boss splines will cause er-
ratic clutch operation.
EAM30114
CHECKING THE PRESSURE PLATE
1. Check:
•
Pressure plate
Crack/damage

Replace.
EAM30115
CHECKING THE PUSH LEVER SHAFT
1. Check:
•
Push lever shaft
Wear/damage

Replace.
EAM30116
CHECKING THE CLUTCH PUSH RODS
1. Check:
•
Push rod 1 “1”
• Bearing “2”
•
Washer “3”
• Push rod 2 “4”
•
Ball “5”
Cracks/damage/wear

Replace.
2. Measure:
• Push rod 2 bending limit
Out of specification

Replace.
EAM30117
CHECKING THE PRIMARY DRIVE GEAR
1. Check:
• Primary drive gear
Damage/wear

Replace the primary drive
and primary driven gears as a set.
Excessive noise during operation

Replace
Clutch spring free length
47.80 mm (1.88 in)
Limit
45.41 mm (1.79 in)
a
Push rod bending limit
0.30 mm (0.012 in)