Yamaha Rhino 450 YXR45FAV, Service Manual

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ENG
CAMSHAFT, ROCKER ARMS AND VALVES
2. Remove:
• valve cotters
NOTE:
Attach a valve spring compressor 1 between
the valve spring retainer and the cylinder head
to remove the valve cotters.
CHECKING THE CAMSHAFT
1. Check:
• cam lobes
Pitting/scratches/blue discoloration
→
Replace.
2. Measure:
• cam lobe dimensions
a
and
b
Out of specification
→
Replace.
Valve spring compressor
P/N. YM-04019, 90890-04019
Camshaft lobe limit
Intake
a
40.52 mm (1.5953 in)
b
32.08 mm (1.2630 in)
Exhaust
a
40.52 mm (1.5953 in)
b
32.08 mm (1.2630 in)
CHECKING THE ROCKER ARMS AND
CAMSHAFT
1. Check:
• camshaft lobe contact surface
1
• valve adjusting screws
2
Blue discoloration/pitting/scratches
→
Replace.