Yamaha VMX12H Supplementary Service Manual page 147

I NSPECTI O N AND REPAI R
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3-23
6. M easur e:
seat w i dt h
O ut of speci f i cat i on/ R em ai ni ng pi t t i ng/
Var i at i on of val ve seat w i dt h
f ur t her .
R em ove just enough m aterial to achieve satisfac-
tory seat.
1. 0
0. 039
Val ve seat recut t i ng st eps are necessary i f :
* Val ve seat i s uni f or m
val ve f ace but t oo w i de or not cent er ed on
val ve f ace.
f ace i ndi cat es t hat val ve seat i s
cent er ed on val ve f ace but i s t oo w i de ( see
" a" di agr am ) .
seat i s i n t he m i ddl e of t he val ve f ace
but t oo nar r ow ( see " b" di agr am ) .
ve seat t oo nar r ow and r i ght up near
I S
val ve m ar gi n ( see " c" di agr am ) .
Cut val ve
0. 1 m m
0. 004 i n
ar ound per i m et er of
To cent er t he seat or
t o r educe i t s w i dt h
. .