Boyesen quick shot 2

So this may be a stupid question but I bought one of these an as far as I understood it they're a one fits all (most 450 bikes have a kiehin fcr carb). I bought it on eBay brand new in package didn't say only fits certain bikes but when I received it, it has a stamp on it that says 2007 crf 250/450 mods required for other models. So what is the difference and or will it work on my 07 yz450?? Thanks in advance for any help

Look up the PN and see if there is a cross reference. I know that same thing happens on a couple parts. Maybe the Boysen site could help. The other option would be to just try it and see what happens. It should only take a couple minutes to see if it fits up properly.

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