KYMCO G-Dink 125i, Руководство пользователя, Страница: 143 / 451

2. Engine > Valves G-Dink 125i
59
Inspect the valves for damage and burning. Measure the valve stem
diameter in several places where the valve makes contact with the
guide. If the measurement is below specification replace the valve.
Item Standard (mm)
IN
4.975
─
4.990
Valve stem O.D.
EX 4.955
─
4.970
Inspect the valve seat and the valve seat width. The valve seat should
be centered on the valve face. If the seat is pitted, worn out, or fits
poorly on the valve face the valve seat must be resurfaced.
Item Standard (mm)
IN 0.55
─
0.85
Valve seat width
EX
1.15
─
1.45
Measure the inside diameter of the valve guides. Replace the guides if
the measurement is out of specification. Calculate the valve stem-to-
guide clearance. Replace the guide and valve if the clearance is out of
specification.
Item
Standard (mm)
IN 5.00 - 5.012
Valve guide I.D.
EX 5.00 - 5.012
IN 0.010 - 0.037
Valve stem-to-guide clearance
EX 0.030 - 0.057