Checking The Camshaft; Checking The Spark Plug - Yamaha F30B 2018 Service Manual

Checking the camshaft

1. Measure:
• Lobe height "a"
Below specification  Replace.
Cam lobe height IN
30.737–30.837
1.2141 in)
Limit
30.587 mm (1.2042 in)
Cam lobe height EX
30.933–31.033
1.2218 in)
Limit
30.783 mm (1.2119 in)
2. Measure:
• Runout
Above specification  Replace.
Runout
0.030 mm (0.0012 in)
a
mm (1.2101–
mm (1.2178–
7-40
3. Measure:
• Camshaft journal diameters "a", "b", and
"c" and cylinder head journal inside diame-
ters "d"
Out of specification  Replace.
d
d
d
Camshaft
Journal diameter
36.925–36.945
1.4545 in)
Cylinder head
Journal inside diameter
37.000–37.025
1.4577 in)

Checking the spark plug

1. Clean the electrodes "a" using a spark plug
cleaner.
a
Camshaft and valve
c
b
a
mm (1.4537–
mm (1.4567–