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Ugh. That piston looks nasty!
To respond to your question, the cylinder and piston will be very close to each other (if everything is correct). For example, an XR200 will have a 63.42mm piston and 63.60mm cylinder, if everything is well worn. A new engine is much tighter. If you intend to bore out an engine and use a new piston, usually 0.5mm is removed.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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