2005 kawasaki KX 250 "ne leakes" Questions

...br8 br9s and tryed diffent mixs with the fule and 2 stroke am goin to try cleanin tank and fule lines and then try a new plug but if ne one has ne idears plz message me thanxs dan NGK brand spark ...

...the valve cover it looks as though the area it the double sided screw sits is threaded on the engine side. The weird part is I can get it tight without the cover and new gasket but when I place