My niner makes a high pitched metal dinging noise above 6.5k rpm in any gear. It is coming from the front of the bike. I have no idea where it's coming from. When i installed my tires i made sure everything was torqued to spec but the problem is still there.
I think it might be the crack on my front fender but i don't think it can make that noise.
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2006 Honda 919 (my baby)
1990 GS500 (POS first bike)
2015 Honda Grom (City destroyer)
May be that cracked fender but i'd also venture you may need to check the Triple tree bearings but if they are really bad you should feel it when coming to a stop or turning the bars, regardless of the engine speed.
88 Blue Hawk (NT650) Project Pics - http://tinyurl.com/clw8h3q
2000 DL650 - Being ridden but make me an offer if interested...
2002 DL1000 V-Strom