Checking The Timing Belt And Sprocket; Checking The Camshaft - Yamaha F150B Service Manual

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Checking the timing belt and
sprocket
1. Check the interior and exterior of the tim-
ing belt. Replace if cracked, damaged, or
worn.
2. Check the drive sprocket a and driven
b.
sprockets
damaged, or worn.
a
7-29
Power unit
Replace if cracked,
b

Checking the camshaft

1. Measure the cam lobe height a and
width b. Replace the camshaft if out of
specification.
Cam lobe height a:
Intake:
45.300–45.400 mm (1.7835–1.7874 in)
Exhaust:
44.350–44.450 mm (1.7461–1.7500 in)
Cam lobe width b:
Intake and exhaust:
35.950–36.050 mm (1.4154–1.4193 in)
2. Measure the camshaft runout. Replace if
out of specification.
Camshaft runout limit:
0.03 mm (0.0012 in)
a
b