Yamaha VMX12H, Дополнительное руководство по обслуживанию

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IN SPEC TIO N A N D R EPA IR
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6. M easure:
seat w idth
O ut of specification/R em aining pitting/
Variation of valve seat w idth Cut val ve
further.
R em o ve ju st en o u g h m aterial to ach ieve satisfac-
tory seat.
1.0 0.1 m m
. .
0.039 0.004 in
Valve seat recutting steps are necessary if:
*Valve seat is uniform around perim eter of
valve face but too w ide or not centered on
val ve face.
To center the seat or
to reduce its w idth
face indicates that valve seat is
centered on valve face but is too w ide (see
“a” di agram ).
seat is in the m iddle of the valve face
but too narrow (see “b” diagram ).
ve seat
IS
too narrow and right up near
val ve m argi n (see “c” di agram ).
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