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Ok.. Just thinking about future engine modifications to the 04' CR250R..now when I need a new piston should I have the cylinder bored over, mill the head, and have a porting job done?

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Ok.. Just thinking about future engine modifications to the 04' CR250R..now when I need a new piston should I have the cylinder bored over, mill the head, and have a porting job done?

No over bore.

Just ported and mill & thinner base gasket.

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