If you over tightened the drain plug nut, you may have stipped some of the threads on the oil pan. A gasket or crush washer wont help you in that case.
Check out this solution.
https://www.hayabusa.org/forum/general-bike-related-topics/114895-stripped-oil-pan-fixed.html
Or do a search for Repair drain plug.
Good luck!
Check out this solution.
https://www.hayabusa.org/forum/general-bike-related-topics/114895-stripped-oil-pan-fixed.html
Or do a search for Repair drain plug.
Good luck!