2.. Did you have crosswinds, when you faced this problem
3.. Do you have noticeable vibrations in your Ninja, especially in the windsheild and Fairing?
The above 3 can be reasons...
BTW, i am able to answer this, since i have myself done 160+ with an LS2 helmet, with no wind pressure at all. Only effect the wind had, that i could not hear my engine sound post 130 kmph, and heard only wind gushing.

regards







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