How is the world is the FZ1 cheaper than the FZ6?
Part of what sets an insurance rate is demographics.
What's the typical demographic that's riding all of the 600 bikes? CBR600, SV650, FZ6, gixxer 600, etc?
Now, What's the typical demographic that's riding the CB900, FZ1, CBR1000, B12, etc?
Insurance companies will tell you that the "younger" crowd is riding the 600s. There are more of them being written off, more of them doing damage to other person's property, and more of them with riders getting killed.
When I phoned my ins co for a quote on the 919, the friend with me said that I cringed noticably while waiting for the quote.
I was "pleasantly" surprised, in that the quote wasn't over $1500/yr for a <1 yr licensed rider on a "might as well be a litre bike". I still found a company that charges less than half of what I was originally quoted and have moved there. I pay less than $600 for full coverage on the bike. The comparable CB600 (Hornet 599) is upwards of $750, and MUST have a two-stage alarm professionally installed on it before they'll insure it.
We've been looking at bikes for the other half for a bit now, and he looks at the ins cost for each of them. -Every- time, the "600" bikes have been more to insure than the litre, litre +, or near litre bikes.