new to me with no manuel. help!
The engine oil is the trans oil.
http://www.thumpertalk.com/forum/showthread.php?t=881284
Read also:
http://www.thumpertalk.com/forum/showthread.php?p=5221903#post5221903
...and download a manual:
http://www.yamaha-motor-europe.com/community/service/manuals.jsp
All this was in the Common Threads Sticky that you apparently bypassed. You might want to give that a look.
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I just got my self a 1998 yz400f. Can any body tell me how to change the transmission fluid? I can't find a fill hole or check hole nor window. any body.