Thanks for the responses below on replacing the top end. Based on the responses, what is the proper way to break in the new piston and rings. Also, do I need any special tools to replace the ring and piston other than a torque wrench? Two more question on the 1995 KDX 200's is it common for there to be a rattling noise comming from the cylinder, someone told me it is? Last question, are the cylinder walls durable on this bike so that there is a good chance I won't need a new cylinder when I inspect it. Thanks for the help. It is much appreciated.