Yamaha YXR660FAS Service Manual download pdf (Page 161)

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ENG

VALVES AND VALVE SPRINGS

11.Measure:

• compressed spring force a

Out of specification → Replace.

b

Installed length

12.Measure:

• spring tilt a

Out of specification → Replace.

Compressed spring force

Intake

100.0 ~ 115.7 N at 27.5 mm

(10.20 ~ 11.80 kg,

22.49 ~ 26.01 lb at 1.08 in)

Exhaust

120.6 ~ 138.3 N at 31.0 mm

(12.30 ~ 14.10 kg,

27.12 ~ 31.09 lb at 1.22 in)

Spring tilt limit

Intake

2.5°/1.4 mm (0.055 in)

Exhaust

2.5°/1.6 mm (0.063 in)

INSTALLING THE VALVES AND VALVE

SPRINGS

1. Apply:

• molybdenum disulfide oil

(onto the valve stem and valve stem seal)

2. Install:

• valve spring seats

• valve stem seals

• valves

• valve springs

• valve spring retainers

NOTE:

Install the valve springs with the larger pitch a

facing upwards.

b

Smaller pitch

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