This is the piston that just came out of my bike. You can very slightly feel the scratching ont he side of the piston. Its on the side of the exhaust manifold. To the eyes and to touch the cylinder wall, I could feel no scoring or scratches. Ihave the new piston and everything already installed in the bike and im just waiting for a power valve gasket to fire it up. Is this scratching normal? The last time I rode it was colder than usual, but the plug reading was still dark brown? Also is this burn pattern ok?
http://www.photodump.com/direct/Joe_148/piston1.jpg
http://www.photodump.com/direct/Joe_148/piston2.jpg
http://www.photodump.com/direct/Joe_148/piston1.jpg
http://www.photodump.com/direct/Joe_148/piston2.jpg