Engine; Adjusting The Valve Clearance - Yamaha 2004 YP400 Service Manual

ADJUSTING THE VALVE CLEARANCE

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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
3. Remove:
• timing plug
• spark plug
• rubber sheet 1
• cylinder head cover 2
• cylinder head cover gasket
4. Measure:
• valve clearance
Out of specification → Adjust.
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)
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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.
CHK
ADJ
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