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new cylinder head - 2004 crf250r

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i understand that a crf250r from 04 can b fitted with the sm head all the way to a 08... what parts does a 250r cylinder head come with ... does it come with the hole valve assembly an stuff like that

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best bet if your staying stock is to put a 08/09 head on it.. assembly comes with guides, seats, cam retainers (come matched with the head)

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2007 has better flow than an 04, and you can use the same valves. The 08 head is better yet, but you must use 08 valves.

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