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Early model 250r valve train blowups

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What did Honda do to prevent the Honda crf250 valve train blow ups, did they revise anything?

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The 06 head has been told it seem to have better valve life, and it has been told that the valve seat material was changed. But I still see them with short valve life. It is a purpose built race bike. Some maintenance is required. You try hitting a surface 233 time a second. Easy fix though. Just takes $. Bronze seats. 

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