A round main jet? Witch craft?

I opened the carburetor on my 06WR450F for the first time since I bought it used two weeks ago and found a "c150" round main jet in there. Did the previous owner install an aftermarket jet kit?

The jet needle isn't stamped with a number. How can I identify this?

I see the O-ring attached to the AP mechanism and the throttle stop bolt has been ground down.

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