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head swap

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I have a cracked head on my 400 and a spare head that's in good shape. I'm not 100% sure if their compatible. The one on the bike now has Y-1 and 5JG00 marked on it and the spare I want to use has Y-2 and 5BE10. Their both 5 valve and the same dimensions. I don't know if any of that information is relevant so I'm hoping someone here can give me an answer. 

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As far as i can work out 5BE10 is YZ400-426 & 5JG00 is WR400-426

Pretty sure it will bolt straight on

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I just checked around ebay and noticed a yz426f head with 5JG00 and a wr400f head with 5BE-11102-30-00 5BE-11191-00-00 for the manufacturer part number. I'm gonna try it anyway 

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