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KX250 top end rebuild

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I'm rebuilding a top end on a KX250 with around 70-80 hours on it. It still runs strong and feels nearly as powerful as new, but I'm sure it's overdue for a rebuild.

What's the difference between cast and forged pistons? Are Vertex pistons any good? I noticed they're cast aluminum and they have some special coating on the skirt.

When are you supposed to go with B-D size pistons (.01" larger size)? I don't plan on getting it bored and replated (though I won't know for sure until I take it apart), but it is generally OK to use the standard size piston?

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I have used Vertex with great results, but I was not able to find any recently. I think they may have gone out of business. What year is your bike?

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