This is the original cylinder off my 2007 KLX250s. I pulled it off when it had 5500 miles on it, and I installed a Bill Blue 351 kit. I kept this original cylinder and piston as insurance, just in case something went wrong with the 351. I sent Bill a separate cylinder for a core and tucked this, my original, away. the 351 has been very reliable, and now I want to clean house so off to eBay it goes. Buy it now price is at $170. Bill Blues core charge is $175, so if you want to keep your original cylinder, you would be about even buying this one to send in for the bore job or as a core.

It will fit a 2006, 2007, 2009, 2010, 2012, or 2013 KLX 250s and the 2009-2010 KLX250sf.

Kawasaki KLX 250S Cylinder Jug and Piston 11005 0112 | eBay