welcome onboard, add pics...
oily filter chamber is normal, flooded with oil, not so good
pull out your spark plug and check the color, if very white-ish, then you are suffering a lean condition, i.e. not enough fuel.
most provable cause would be dirty/clogged jets in the carb, or sometimes even water in the bowl.
easy to check, start with the simple stuff, see if it helps.
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