recently I was thinking about buying new exhaust system, but long story short, I decided to take a flashlight and check how the exhaust flanges and bolts are looking.
Instead I noticed there was quite a lot of dirt stuck to the right side of the engine, between the cylinders 3 and 4. I have the bike for almost a year and never noticed that. The picture is taken after I cleaned it up a bit.
First thing I thought of was a blown gasket, but the first rib (on which the gasket is) was clean, without any dirt or oil marks, the oil and dirt starts on the second rib from the top (counting from the bottom of the exhaust flange). I seems to me that the oil is leaking from somewhere I can't see and then flowing down on this bolt and onto the engine:
From a quick search I just did I gathered that somewhere on the 4th cylinder is an oil passage, which can cause problems. Over the last year I learned about and worked on almost everything on the bike, except the engine itself (I kinda hoped it would not need my attention for a while, but guess not...
) I would really like to hear the opinion on this from somebody a bit more experienced than me. Thank you!