I thinking about buying a 2006 Z1000 with around 15k on it. It has been down once and the owner only replaced the muffler and the bar end. It looks like it was a low speed deal as the damage is very light and the frame slider sure did it's job. Is there anything else I should check? Also, what should be a reasonable price for the bike?
Last but not least, are there any other issues I should know about on this model?
If he lets you, take the thing for a ride. Get it up to around 40mph, then let go of the handlebars - if they start shaking slightly, then the accident caused some frame tweaks... This happened to mine after I was hit on the freeway and the bike basically ghost-rided itself until it fell over like a low side accident. Wasnt dropped HARD, yet the steering still shook like crazy if you let off the bars.
Also, take a close look around where the radiator attaches to the frame - if you see any rust or change in the paint there, its because the crash actually bent the radiator as well.
Neither of these are DETRIMENTAL to the bike - I still rode mine around for two years in that condition. It was fine. Reason I say you look for this is because you can use that info to drop the price accordingly.
As for value, depends upon what state you are in. Check KBB.com - they give retail and trade in prices. Your price (private seller) should be between the two ranges they give you.
Good luck!