Daelim B-Bone 125cc service manual.pdf - Mojo

CYLINDER HEAD / VALVES
VALVE SEAT
● 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.
37
45
55
● 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.
ROUGHNESS
● Using a 45 degree cutter, remove any roughness or
irregularities from the seat.
● Using a 37 degree cutter, remove ¼ of the existing
valve seat material.
37
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