Yamaha F115A - Checking the Valve Spring; Checking the Cylinder Head; Checking the Valve Guide

5-29
POWR
E
VALVES
CHECKING THE VALVE SPRING 5
1. Measure:
• Free length a
Out of specification → Replace.
Free length limit
52.25 mm (2.057 in)
5330
2. Measure:
• Valve spring tilt a
Out of specification → Replace.
Valve spring tilt limit
IN and EX
2.6 mm (0.10 in)
5340
CHECKING THE CYLINDER HEAD 5
Measure:
• Cylinder head warpage
Out of specification → Reface or
replace.
Warpage limit
0.1 mm (0.004 in)
5350
CHECKING THE VALVE GUIDE 5
Measure:
• Valve guide bore a
Out of specification → Replace the
guide.
Replacement steps
(1) Remove the valve guide with the valve
guide remover/installer.
Valve guide bore
6.005 - 6.018 mm
(0.2364 - 0.2369 in)
Valve guide remover
YM-4064-A / 90890-04064
a
5360
5370