Yamaha Motor YZ250F 2005 Manuel D'atelier Du Proprietaire page 330

Table des Matières

Publicité

VALVES AND VALVE SPRINGS
5. Measure:
NOTE:
• When installing a new valve always replace
the guide.
• If the valve is removed or replaced always
replace the oil seal.
6. Eliminate:
7. Inspect:
8. Measure:
Measurement steps:
• Apply Mechanic's blueing dye (Dykem) b
• Install the valve into the cylinder head.
• Press the valve through the valve guide
• Measure the valve seat width. Where the
• If the valve seat is too wide, too narrow, or
4 - 38
• Runout (valve stem)
Out of specification → Replace.
Runout limit:
0.01 mm (0.0004 in)
• Carbon deposits
(from the valve face and valve seat)
• Valve seat
Pitting/wear → Reface the valve seat.
• Valve seat width a
Out of specification → Reface the valve
seat.
Valve seat width:
Intake:
0.9 ~ 1.1 mm
(0.0354 ~ 0.0433 in)
<Limit>: 1.6 mm (0.0630 in)
Exhaust:
0.9 ~ 1.1 mm
(0.0354 ~ 0.0433 in)
<Limit>: 1.6 mm (0.0630 in)
to the valve face.
and onto the valve seat to make a clear
pattern.
valve seat and valve face made contact,
blueing will have been removed.
the seat is not centered, the valve seat
must be refaced.
ENG

Publicité

Table des Matières
loading

Ce manuel est également adapté pour:

Yz250fv 2005

Table des Matières