Yamaha F150 [118/313] Checking the camshaft

Yamaha F150 [118/313] Checking the camshaft
POWR
Power unit
5-33
63P3F11
7. If the valve seat contact area is too nar-
row and situated near the top edge of the
valve face, use a 30° cutter to cut the top
edge of the valve seat. If necessary, use
a 45° cutter to center the area and set its
width.
b
Previous contact width
8. If the valve seat contact area is too nar-
row and situated near the bottom edge of
the valve face, use a 60° cutter to cut the
bottom edge of the valve seat. If neces-
sary, use a 45° cutter to center the area
and set its width.
b
Previous contact width
9. Apply a thin, even layer of lapping com-
pound onto the valve seat, and then lap
the valve using a valve lapper (commer-
cially available).
CAUTION:
Do not get the lapping compound on the
valve stem and valve guide.
10. After every lapping procedure, be sure to
clean off any remaining lapping com-
pound from the cylinder head and the
valve.
11. Check the valve seat contact area of the
valve again.
Checking the camshaft
1. Measure the cam lobe. Replace if out of
specification.
2. Measure the camshaft runout. Replace if
out of specification.
Cam lobe
a
:
Intake:
45.30045.400 mm
(1.78351.7874 in)
Exhaust:
44.35044.450 mm
(1.74611.7500 in)
Cam lobe
b
:
Intake and exhaust:
35.95036.050 mm
(1.41541.4193 in)

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