05 zx6r steering vibration

I have noticed that when riding quite slow (under 20kmph) that I get a strange vibration through the bars.
A mechanic once told me that Kwaka's are a little unstable at slow speed due to the steering geometry; is this related and normal for these bikes?
Any help or suggestions would be much appreciated.
A mechanic once told me that Kwaka's are a little unstable at slow speed due to the steering geometry; is this related and normal for these bikes?
Any help or suggestions would be much appreciated.