Hey guys, just got home from a ride and put the bike in the garage. Just got the bike a few weeks ago and tonight started doing some clutch up wheelies in 1st. So fun. The bike is a 2000 CBR 600F4. I just had a look at the shifter side around the casing and saw this. What is the fix?? I know it's due for an oil change but why is this happening? Thanks. Looking forward to getting some quick answers of what caused this and how it needs to get back to perfect.

 

Looks like it could be the counter shaft seal,this is usually caused by the chain being to tight.Take the cover off and remove the counter sprocket to check.

 

Mine was missing the o ring in the gasket that could be it too.

 

Has it come loose ?