Engine; Adjusting The Valve Clearance - Yamaha YFM250RX 2008 Service Manual

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ADJUSTING THE VALVE CLEARANCE

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3-9
EAS00048

ENGINE

ADJUSTING THE VALVE CLEARANCE
The following procedure applies to all of the
valves.
NOTE: 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 the Top
Dead Center (TDC) on the compression
stroke.
1. Remove:
• seat
• front fender
• fuel tank
Refer to "SEAT, FENDERS AND FUEL
TANK".
2. Remove:
• spark plug cap
• spark plug
• cylinder head side cover
• cylinder head side cover
3. Remove:
• timing mark accessing screw
• crankshaft end accessing screw
4. Measure:
• valve clearance
Out of specification → Adjust.
Valve clearance (cold)
Intake valve
0.05 ~ 0.10 mm
(0.0020 ~ 0.0039 in)
Exhaust valve
0.10 ~ 0.15 mm
(0.0039 ~ 0.0059 in)
CHK
ADJ
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