Yamaha F400A 2022 - Checking the Valve Lifter; Checking the Camshaft

7-50
Camshaft
Checking the valve lifter
1. Check:
• Valve lifter
Damaged/scratched/worn → Replace.
2. Measure:
• Valve lifter outside diameter “a”
Out of specification → Replace.
Checking the camshaft
1. Check:
•Pulser rotor
Damaged/rough/scratched → Replace.
TIP:
• Be careful not to scratch or damage the face
of the flange.
• If there is a scratch that is more than 0.2 mm
(0.008 in) deep or more than 0.5 mm (0.020
in) wide on the surface of the flange, an error
may occur in the cam position sensor signal.
2. Measure:
• Cam lobe height “a”
• Fuel pump cam width across corners (di-
rect injection pump) “b”
Out of specification → Replace.
Maximum wear depth
1.00 mm (0.0394 in)
Outside diameter
30.964–30.980 mm (1.2191–
1.2197 in)
a
a
IN
EX
a
b
b