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This question tests the limits of the motorcycle mechanical knowledge of the team as we have never taken apart a CG motor to understand firsthand the workings so if we get this wrong anywhere you motorcycle mechanics out there can clean this up. The CG motor does not have an "oil filter" that one thinks of like a car which forces all oil through a media to trap particles.
There is a screen on the oil pump inlet within the oil sump that prevents large size particles from being sucked into the oil pump so some of these particles would be kept out of the oil pump and others small enough to pass through the screen. If not sucked up into the pressurized oil system they are still in the crankcase where they can still be thrown around in the workings. The second device is called an oil spinner or centrifugal oil filter that sits on the end of the crankshaft and I believe it is connected to the oil pump and as oil enters by force it slings the debris out to be trapped against the sides. The spinner does need to be cleaned so often and also the screen but the oil pump screen faces out so it does not trap particles, it prevents them from entering, think of a sewing thimble shaped screen facing out. To really get the debris out the oil has to be changed.
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