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That will happen if the bike falls over.
That sponge block in the corner covers the crank case breather tube, the bock is made to make oil fumes into oil droplets so they get bigger and drop out of the air.
If the bike falls over the oil comes up the breather tube, past the block and into the air box.
Clean the oil out and keep a eye on it, if you keep getting oil without the bike falling over you have motor problems.
Blow by the piston rings is a way of getting oil into the air box this would also cause the motor to perform poorly and could be the reason you are having trouble.
That sponge block in the corner covers the crank case breather tube, the bock is made to make oil fumes into oil droplets so they get bigger and drop out of the air.
If the bike falls over the oil comes up the breather tube, past the block and into the air box.
Clean the oil out and keep a eye on it, if you keep getting oil without the bike falling over you have motor problems.
Blow by the piston rings is a way of getting oil into the air box this would also cause the motor to perform poorly and could be the reason you are having trouble.