Oil Question

Energy One
Just bought a 2003 Mastiiff with 2k miles.

When the bike runs for a bit and gets good and hot, the oil starts seeping back out of the filler where the cap is on it. Does the bike have too much oil in it? There is no dip stick. just a cap that pushes down in there. i havent seen any way to check the oil level. Shouyld there be an eye glass or something?


My first bike so forgive me if this sounds stupid, and thanks for the help.
 
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