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Old 04-22-2011, 11:11 PM   #36
Brtp4 OP
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Joined: Sep 2006
Location: Bend, OR
Oddometer: 1,965
The airbox side OD is bigger, so an XR400 boot is needed:





One thing that is different, and still unresolved, is the crankcase venting. My bike is a California model, and had a more extensive crankcase recirc system. The 250 boot has a boss to attach the hoses to, that the 400 boot does not have.



Also, I noticed that the stock intake manifold had hardened considerably, so I took no chances and replaced it.
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Brtp4 screwed with this post 10-04-2014 at 06:50 AM
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