Yamaha Vmax VMX17C 2009 - Engine; Adjusting the Valve Clearance

ENGINE
3-4
EAS20472
ENGINE
EAS20530
ADJUSTING THE VALVE CLEARANCE
The following procedure applies to all of the
valves.
T
IP
• Valve clearance adjustment should be made
on a cold engine, at room temperature.
• When the valve clearance is to be measured or
adjusted, the piston must be at top dead center
(TDC) on the compression stroke.
1. Remove:
• Generator cover plate
Refer to “GENERATOR AND STARTER
CLUTCH” on page 5-37.
• Cylinder head covers
Refer to “CAMSHAFTS” on page 5-9.
2. Remove:
• Timing mark accessing screw “1”
• Crankshaft end cover “2”
3. Measure:
• Valve clearance
Out of specification → Adjust.
T
IP
• If the valve clearance is incorrect, record the
measured reading.
• Measure the valve clearance in the following
sequence.
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Piston #1 TDC
a. Position piston #1 at TDC by turning the
crankshaft counterclockwise until the “T1”
mark “a” on the generator rotor is aligned with
the stationary pointer “b” on the generator
cover.
b. Check that the punch mark “c”, punch mark
“d”, and “1” mark “e” are aligned as shown.
c. Measure the valve clearance with a thickness
gauge.
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Piston #3 TDC
a. Position piston #1 at TDC.
Valve clearance (cold)
Intake
0.10–0.17 mm (0.0039–0.0067 in)
Exhaust
0.22–0.29 mm (0.0087–0.0114 in)
Valve clearance measuring sequence
Cylinder #1 → #3 → #2 → #4
2
1
A. Front
Thickness gauge
90890-03180
Feeler gauge set
YU-26900-9
T1
ab
c
d
e