250F 2010 kx250f oil leak

I went out to look at my bike which I had stored for the winter and found a puddle of oil that looked like it leaked from the left side of the motor and I'm no big mechanic any idea on what it might be, thanks!
 
What is this plug for anyways
it lets you see the flywheel, the large one lets you rotate the crank and through the small hole you will see marks indicating what position the crank/piston is at, top dead center for example, which it needs to be at in order to check the valves and time the engine.
 
it lets you see the flywheel, the large one lets you rotate the crank and through the small hole you will see marks indicating what position the crank/piston is at, top dead center for example, which it needs to be at in order to check the valves and time the engine.
Thanks, I do need to shim the valves also. My local Kawasaki dealer should sell o rings eh?
 
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