Yamaha WR45OFR service manual Inspection, Runout camshaft Less than 0.03 mm 0.0012

CAMSHAFTS

ENG

1 2

3

6.Remove:

●Clips

●Exhaust camshaft 1

●Intake camshaft 2

NOTE:

Attach a wire 3 to the timing chain to prevent it from falling into the crankcase.

INSPECTION

Camshaft

1.Inspect:

●Cam lobes

Pitting/scratches/blue discoloration → Replace.

2.Measure:

●Cam lobes length a and b Out of specification → Replace.

Cam lobes length:

Intake:

a31.200 ~ 31.300 mm

(1.2283 ~ 1.2323 in) <Limit>: 31.100 mm (1.2244 in)

b22.550 ~ 22.650 mm

(0.8878 ~ 0.8917 in) <Limit>: 22.450 mm

(0.8839 in) Exhaust:

a30.950 ~ 31.050 mm

(1.2185 ~ 1.2224 in)

<Limit>: 30.850 mm (1.2146 in)

b22.494 ~ 22.594 mm

(0.8856 ~ 0.8895 in) <Limit>: 22.394 mm (0.8817 in)

3.Measure:

●Runout (camshaft)

Out of specification → Replace.

Runout (camshaft):

Less than 0.03 mm (0.0012 in)

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