In this video I picked up a $850 2009 Kawasaki KX85 with a KX100 big wheel conversion. The bike had previously cold seized and lost compression on a brand new piston and cylinder. I rehoned the cylinder and put a new ProX piston in and had a great running bike. I broke it in and took it to the track putting 4 hours on it with no issues. Finally freshened it up with new plastics and graphics.