Yx140 big valve head

[pidasmuz]

Hi i'm knew here,
can anyone tell me how i can tell whether my Yx140 engine has the larger valves
without pulling the head off and actually measuring them?

 

[The_GDFP]

It does....

 

[pidasmuz]

i've read somewhere that there's two different versions of the yx140 heads, one with smaller and one with larger valves?
is this true, and how could one tell which are which?

 

[sean01]

iv never come across a small valve 140 head.

if it was a 125 then id say yeah

as for telling the difference...

2 bolt tappet covers usually mean big valve
screw in tappet covers like genuine crf50's are small valve