Yamaha F40BWHD - Checking the Rocker Arm and Rocker Shaft; Checking the Valve Spring

CYLINDER HEAD
5-32
E
POWR
CHECKING THE VALVE SPRING
1. Measure:
• Free length
Out of specification → Replace.
2. Measure:
• Tilt valve
Out of specification → Replace.
CHECKING THE ROCKER ARM AND
ROCKER SHAFT
1. C h e ck:
•Rocker arm
Pitting/wear → Replace.
2. Measure:
• Rocker arm inside diameter
• Rocker shaft outside diameter
Out of specification → Replace.
a
Free length limit
37.85 - 39.85 mm
(1.491 - 1.569 in)
a
a
Tilt limit
IN, EX 1.7 mm (0.07 in)
a
a
b
Rocker arm inside diameter
16.000 - 16.018 mm
(0.6299 - 0.6303 in)
Rocker shaft outside diameter
15.971 - 15.991 mm
(0.6288 - 0.6296 in)
a
b
a
b