Checking The Clutch Housing; Checking The Clutch Boss; Checking The Pressure Plate; Checking The Push Lever Shaft - Yamaha YZ450FX 2019 Owner's Service Manual

Clutch spring free length
48.00 mm (1.89 in)
Limit
45.60 mm (1.80 in)
EAM30112

CHECKING THE CLUTCH HOUSING

1. Check:
• Clutch housing dogs "1"
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.
1 1 1
3 3
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
5-44
1 1 1
2 2
5 5
Push rod bending limit
0.10 mm (0.004 in)
CLUTCH
4 4