HYOSUNG RX 125 Service Manual page 45

3-15 ENGINE
● Lubricate each seal, and drive them into posi-
tion with the valve stem seal installer ①.
CAUTION
Do not reuse the oil seals.
Valve guide installer and stem seal installer
: 09916-44910
VALVE SEAT WIDTH
● Coat the valve seat with prussian blue uniformly.
Fit the valve and tap the coated seat with the
valve face in a rotating manner, in order to
obtain a clear impression of the seating
cotact. In this operation, use the valve lapper
to hold the valve head.
● The ring-like dye impression left on the valve
face must be continuous-without any break. In
addition, the width of the dye ring, which is the
visualized seat "width" , must be within the
specification.
Valve seat width
Valve seat width
If either requirement is not met, correct the seat by
servicing it as follows.
VALVE SEAT SERVICING
The valve seats for both intake and exhaust valves
are angled to present two bevels, 15�and 45� .
Valve seat cutter set : 09916-21110
Use only for 15�of intake side
15� ×75� Valve seat cutter : 09916-24910
Solid pilot (N-140-5.5) : 09916-24480
CAUTION
The valve seat contact area must be inspected
after each cut.
Standard 0.9~1.1mm
0。
15。
15。
45。
45。
Valve seat
①