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Can a 02 CR 250 be upgraded with a 05 cylinder and head?

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Don't believe so. I know the 125 has a different water pump and cases

125's are a different bike.  it can be done on the 250's with the domed piston, expansion chamber & CDI.  The CDI isn't as crucial, but would provide the right mapping for the 05-07 porting specs.  

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