YZF-R1 Gas tank filler cap issue - water entering

I've told you about the issue I had with water entering my gas tank through the filler cap. Here are pictures of how it looks like. I took the filler cap apart, sanded and sprayed it, put it all back, greased it, but after a couple months the same issue comes back, the inside of the filler cap rusts, water comes in after heavy rain....

My Yamaha YZF-R1 gas tank filler cap is rusted. See the water on the right, inside?


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