Oil leak
 

My GZ250 is leaking oil, the leakage is small, it is not noticeable on the floor where I park the bike (no drops) but you can see oil around the cylinder (attached pics), nevertheless I would like to know your opinion on when I should start to get worried about the leakage being to much. I check the engine oil every time I ride so I am not too worried about the motorcycle having a low level of oil.

I will appreciate any advice you can provide.

Thanks.

Check the head bolts. The GZs have a penchant for leaking on the left front. Usually, the head bolts have vibrated loose. Be careful not to over tighten them. Maybe someone else can chime in to let you know how much torque is needed without breaking anything.