A WoF has nothing to do with oil or fuel leaks unless the oil is dripping on the floor or over your back tyre and the fuel is not actualy wet - the word is considerable and I consider any leaks should be put under consideration,just my considered opinion.
Sounds like the big nut could be the cam chain tensioner,there could be an Oring to seal this,we need that picture.Oil weeps on a bike of this age are pretty normal,dripping oil is not - give it a good clean and go for a thrash,then check them again - if it's gushing out you have a problem,just a weep is nothing to cry about.
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