I think I've found a decent 98 XJR on trademe http://www.trademe.co.nz/a.aspx?id=411663465 The seller seems like a very decent chap and the bike certainly looks cool in the flesh.
My major concern about it is it definitely runs hotter than the GSX1400 I have at home. I'm hoping to find some assurances that it's normal before I buy it but it definitely runs really well.
It definitely needs a good service. I was hoping someone could point me in the direction of a good independent bike garage. I'm staying near Whangaparaoa but I have my days free.
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