Yamaha YXR660FAS Service Manual download pdf (Page 187)

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ENG

PRIMARY AND SECONDARY SHEAVES

CHECKING THE PRIMARY SHEAVE

1. Check:

• weight outside diameter a

Out of specification → Replace the weight.

Weight outside diameter

30 mm (1.18 in)

<Limit>: 29.5 mm (1.16 in)

2. Check:

• primary pulley slider

• primary sliding sheave splines

Wear/cracks/damage → Replace.

• spacer

• primary pulley cam

Cracks/damage → Replace.

3. Check:

• primary sliding sheave

• primary fixed sheave

Cracks/damage → Replace.

CHECKING THE SECONDARY SHEAVE

1. Check:

• secondary fixed sheave smooth operation

• secondary sliding sheave smooth operation

Scratches/damage → Replace as a set.

2. Check:

• torque cam grooves 1

Wear/damage → Replace.

3. Check:

• guide pins 2

Wear/damage → Replace.

4. Check:

• secondary sheave spring

Damage → Replace.

5. Measure:

• secondary sheave spring free length a

Out of specification → Replace the second-

ary sheave spring.

Free length

124.2 mm (4.89 in)

<Limit>: 112.0 mm (4.40 in)

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