Yamaha F100A, Service Manual

Page: 186 / 463

5-21
POWR
E
CAMSHAFTS
SERVICE POINTS
Camshaft inspection
1. Measure:
●
Camshaft lobe dimensions
a
and
b
Out of specification
→
Replace the
camshaft.
2. Measure:
●
Camshaft journal diameter
a
●
Camshaft cap inside diameter
b
Out of specification
→
Replace the
camshaft or cylinder head.
Camshaft lobe dimension:
a
IN: 37.22 ~ 37.38 mm
(1.465 ~ 1.472 in)
b
IN: 29.92 ~ 30.08 mm
(1.178 ~ 1.184 in)
a
EX: 36.90 ~ 37.06 mm
(1.453 ~ 1.459 in)
b
EX: 29.92 ~ 30.08 mm
(1.178 ~ 1.184 in)
Camshaft journal diameter:
a
: 24.96 ~ 24.98 mm
(0.9827 ~ 0.9835 in)
Camshaft cap inside diameter:
b
: 25.000 ~ 25.021 mm
(0.984 ~ 0.985 in)
b
b
a
Camshaft installation
1. Install:
●
Camshaft
●
Camshaft cap
Installation steps:
●
Before installing the exhaust and
intake camshafts, turn the crankshaft
until cylinder #1’s piston is at TDC on
the compression stroke.
●
Install the camshaft caps in the proper
position as shown and with the
stamped numbers facing upside
down.
5
2 A
1
1
A
7
2 A
6
1
A
8
2 A
9
2 A
10
2 A
6
7
8
9
10
2
2 A
1
1
A
3
2 A
4
2 A
5
2 A
1
2
3
4
5