Yamaha F100A - Cylinder Head Inspection; Valve Guide Inspection; Valve Spring Inspection

5-28
POWR
E
VALVES
Valve spring inspection
1. Measure:
● Free length a
Out of specification → Replace.
Free length limit:
52.25 mm (2.057 in)
2. Measure:
● Valve spring tilt a
Out of specification → Replace.
Valve spring tilt limit:
IN and EX: 2.6 mm (0.10 in)
Cylinder head inspection
1. Measure:
● Cylinder head warpage
Out of specification → Reface.
Warpage limit:
0.1 mm (0.004 in)
Valve guide inspection
1. Measure:
● Valve guide bore a
Out of specification → Replace the
guide.
Valve guide bore:
6.005 ~ 6.018 mm
(0.236 ~ 0.237 in)
Replacement steps:
● Remove the valve guide with the valve
guide remover/installer.
Valve guide remover/installer:
YM-4064-A/90890-04064
a