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[QUOTE="jeredh, post: 1244952, member: 64361"]
This is not correct.  I have a service manual for a 2003 KX250 M1 (M1 just designates two stroke machine) in front of me, and it states:

"If any of the cylinder inside diameter exceeds the service limit, the cylinder must be replaced with a new one since the PLATED cylinder cannot be bored or honed".

You can have the cylinder replated, but I would be safe and stick with the manufacturer's suggested and DO NOT bore or hone a plated cylinder.  You can replace the cylinder at a fair price, and save yourself a huge headache down the road.  Wiseco does make a piston/ring kit for bored cylinders for the 2003 KX250.  So you can bore it, but i wouldn't.   Boring it will remove the electrofused plating.  If you read the benefits of this plating, you'll understand why you do not want to bore or hone the plating.  GET A SERVICE MANUAL!

I also recommend not using anything abrasive to clean the cylinder.  This means no scotchbrite pads, etc.   Soap, water and elbow grease is all I do.

I just put a new piston, ring and gaskets in my 2003 KX250 yesterday, for what it's worth. Removing the cylinder and jug took about 1-1/2 hours.  Replacing the piston, rings and  gasket and putting it all back together will take about the same time.

I'm also replacing the reeds and putting a new exhaust on.

:)
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