DAELIM BESBI SC125 - Service Manual - page 97

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