Started to put new rings in my top end today ('01 KDX200) and found that my piston was crack and the cylinder had some gouging. The odd thing was that 7 of the 8 bolts for the head had white corrosion on the shanks, but one was shiny new looking. I bought this bike in Aug. of '09 and am the second owner. The original owner said he never rebuilt the top end, but now I wonder. How can I tell if the cylinder has been worked on? Re-plated or sleeved? After cleaning the carbon off of the piston the only markings I could find was the letter "B" and and arrow. Is this a factory mark/piston? I also suspended a small magnet in the cylinder and it was attracted to the sides of the cylinder. Does this indicate that it has been sleeved?
Here are some pictures,
Edited by Sthutch, 22 December 2010 - 07:58 PM.
updating with pics