Yamaha 2004 YP400, Руководство по обслуживанию, Страница: 89 / 417

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CHK
ADJ
ADJUSTING THE VALVE CLEARANCE
EAS00048
ENGINE
ADJUSTING THE VALVE CLEARANCE
The following procedure applies to all of the
valves.
NOTE:
_
• 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:
• storage box
Refer to “RIDER SEAT AND STORAGE
BOX”.
2. Remove:
• V-belt case air filter cover
1
• V-belt case air filter element
1
3. Remove:
• timing plug
• spark plug
• rubber sheet
1
• cylinder head cover
2
• cylinder head cover gasket
1
2
4. Measure:
• valve clearance
Out of specification
→
Adjust.
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a. Turn the primary sheave nut on the left side
of the crankshaft counterclockwise to turn
the crankshaft.
b. Align the “I” mark
a
on the generator rotor
with the stationary pointer
b
on the genera-
tor rotor cover to position the piston at TDC
on the compression stroke.
Valve clearance (cold)
Intake valve
0.15 ~ 0.20 mm
(0.0059 ~ 0.0079 in)
Exhaust valve
0.25 ~ 0.30 mm
(0.0098 ~ 0.0118 in)