Small honda 5.5 engine shaft PTO attachment?

I recently found a small 5.5 honda engone in my garage, and when i was running it, i noticed that the shaft wasn't spinning fast at all, then i noticed this weird circular thing bolted onto it, and it had its separate oil fill hole… What is this? How do i take it off?! I don't want to take it off and mess it up

Without a picture of it I can only guess that you are talking about the clutch.

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