Small oil leak on cooling fins

[antipeterleague]

Hey guys, have a small issue, hopefully it is easily resolvable.

This is my first bike, 2001 with about 17000km.

The second day of owning it I noticed the oil to be incredibly low so I changed it myself, the chain was looking horrid so I cleaned and lubed it, all this thanks to some helpful posts on this forum.

I saw a thread about an oil leak a few posts down and thought my problem was identical, but upon further inspection there is no leak around the exhaust connection to the engine. Instead it seems like its coming from the open area between the cooling fins, if that makes sense. Here are some pictures I snapped on my phone




The first image depicts what I'm talking about, there is a line of oil on the 4th fin down, on the right side of the middle divider.