Remove the valve and inspect the valve seat face.
The valve seat contact should be within the specified
width and evenly all around the circumference.
If the valve seat width is not within specification,
reface the valve seat.
NOTE
Valve faces and stem tips cannot be ground. If a valve
face or stem tip is rough, worn unevenly, or contacts
the seat improperly, the valve must be replaced.
Measure the valve seat width.
STANDARD VALUE : 0.8 -1.0 mm
SERVICE LIMIT : 1.4 mm
VALVE SEAT REFACING
Reface the worn valve seat by using valve seat cutters
and grinders.
NOTE
Follow the refacer manufactuer’s operating instructions.
Reface the valve seat whenever the valve guide has
been replaced.
Be careful not to grind the seat more than necessary.
Using a 45 degree cutter, remove any roughness or
irregularities from the seat.
Using a 37 degree cutter, remove
of the existing
valve seat material.
9-9
CYLINDER HEAD / VALVES
Summary of Contents for BESBI SC125 -
Page 1: ......
Page 36: ...MEMO...
Page 56: ...MEMO...
Page 60: ...7 0 LH CRANKCASECOVER KICKSTARTER CONTINUOUSLYVARIABLE TRANSMISSION...
Page 77: ...MEMO...
Page 78: ...8 0 A C GENERATOR STARTER CLUTCH...
Page 87: ...MEMO...
Page 88: ...9 0 CYLINDER HEAD VALVES...
Page 104: ...10 0 CYLINDER PISTON...
Page 111: ...MEMO...
Page 112: ...11 0 TRANSMISSION CRANKSHAFT CRANK CASE...
Page 123: ...MEMO...
Page 124: ...MEMO...
Page 136: ...MEMO...
Page 144: ...MEMO...
Page 164: ...MEMO...
Page 178: ...MEMO...
Page 184: ...MEMO...
Page 185: ...20 WIRING DIAGRAM G Gr B G O Lb Lb I GNI TI ON SWI TCH G O COMBI MERER ASS Y...
Page 186: ...I GNI TI ON SWI T CH FUEL UNI T ENGI NE STOP SWI T CH PASS...
Page 187: ...SERVICEMANUAL 2007 09 PRINTED 2007 09 PUBLICATION...
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