DAELIM VJF125 Service Manual - page 147

10-9

CYLINDER HEAD / VALVES

70

45

OLD SEAT WIDTH

SEAT WIDTH

Apply  a  light  coating  of  Prussian  Blue  to  each  valve

face.

Tap the valve against the valve seat serveral times with

the  valve  guide  reamer,  without  rotating  the  valve,  to

check for proper valve seat contact.

If  the  contact  area  is  too  high,  grind  the  seat  using

cutter as like. 

IN  : 20 degree , EX : 30 degree flat cutter

Refinish  the  seat  to  specifications,  using  a  45  degree

finish cutter.

If  the  contact  area  is  too  low  on  the  valve,  grind  the

seat using 70 degree cutter..

Refinish  the  seat  to  specifications,  using  a  45  degree

finish cutter.

Using a 70 degree cutter, remove the bottom 

of the

old seat.

Using  a  45  degree  cutter,  cut  the  seat  to  the  proper

width.

VALVE SEAT WIDTH : 0.9~1.1mm

35

60

CONTACT TOO HIGH

CONTACT TOO LOW

OLD SEAT WIDTH

OLD SEAT WIDTH