Yamaha XC200T Service Manual page 74

LENG 1%®_ INSPECTIONAND REPAmR
(_} . .... 3_Cut:
®Valve guide inside diameter {_}
Use the Valve Guide Reame_ (YM@1227)
{!/.
NOTE:
_Valve guide reamer must be turned clockwise
when inserting or drawing,
@
_a} {_} Valve guide
Vahze Seat
1, Eliminate:
eCarbon deposit
From valve seat and valve face (,_},
2, AppEy:
_Mechanics bluing dye (Dykem) _)
Ob
,/ To contact surface of valve face,
3, Position:
oVatves (Intake and exhaust)
Into cyfinder head,
Spin the vatve quickly back and forth with
a Lapping Stick £_i},then putl out the valves,
/ }
4,, Measure:
_Valve seat width
The valve seat and vatve face will have re-
moved bluing wherever they contacted each
other,
Out of specification/Pitting/Variation of
valve seat width-*Cut vatve seat further,
a t Width
andard: 0,9_ 1.1 mm
(&035 0°043 in)
L Wear limit: 2.0 mm {0.080 in}
3_21