Checking The Primary Drive Gear; Checking The Friction Plates; Checking The Clutch Plates - Yamaha YBR250 2007 Service Manual

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CHECKING THE PRIMARY DRIVE GEAR

1. Check:
• primary gear nut 1
• lock washer 2
1
• washer 3
• primary drive gear 4
Wear/Cracks --> Replace.

CHECKING THE FRICTION PLATES

The following procedure applies to all of the clutch
plates.
1. Check:
• friction plates (narrow)
• friction plate
Damage/Wear --> Replace the friction
plates as a set.
2. Measure:
• friction plate thickness (narrow)
• friction plate thickness
Damage/Wear --> Replace the friction
plates as a set.
NOTE:
Measure the friction plate at four points.
Friction plats thickness
2.90 ~ 3.10 mm (0.11 ~ 0.12 in)

CHECKING THE CLUTCH PLATES

The following procedure applies to all of the steel
discs.
1. Check:
• clutch plates
Damage --> Replace the clutch plates as a
set.
2. Measure:
• steel disc runout (use the thickness gauge 1)
Out of specification --> Replace the steel
discs as a set.
Clutch plate runout limit
0.20 mm (0.079 in)
5-42
ENG
CLUTCH