Yamaha YX600S Service Manual page 77

~~~~~~~~~1_N_SP_E_C_T_1o_N~A_N_D~R_E_PA_1_R_I
ENG
1~1
302-013
3. Bore valve guide
~
to obtain proper valve
stem clearance.
Use 6 mm (0.24 in) Reamer (YM-04066)
G).
Valve Seat
1. Inspect:
•Valve seat
Pitting/Wear-+ Cut.
2. Measure:
•Valve seat width
G)
Out of specification-+Follow next steps.
Standard width Wear limit
Valve
seat
width
3.
Apply:
1.0±0.1 mm 2.0 mm
(0.039±0.0039 in) (0.078 in)
•Mechanic's bluing dye (Dykem)
(to valve and seat)
4. Position:
•Valve
(into cylinder head)
5.
Spin it rapidly back and forth, then lift valve
and clean off all grinding compound.
6. Inspect:
•Valve seat surface
Wherever valve seat and valve face made
contact, bluing will have been removed.
7. Measure:
•Valve seat width
Valve seat width must be uniform in contact
area.
Out of specification-+Cut.
3-20