The fuel tank whine was the very first mod I did to the 2 Ninja's, I found it that annoying...
http://www.kawiforums.com/ninja-250r...-pictures.html
It worked completely on the Red but the Black still has the occasional 'moan', I'm going to replace both fuel caps with SSR fuel caps...
http://www.slingshotracing.net/catal...cap-p-158.html