JD Jet Kit in 2001 yz426f?

Has anyone tried the JD jet kit in their 2001 YZ426F? I want to buy one for my cousins bike as a present but he is one of those guys that thinks that his bike runs good enough and says he does not want to mess it up. I have a JD kit in my 2002 yz250f and it was worth every penny. Is it worth it for the YZ426F?

I have never seen anything but good written about his kits. Your brother doesnt know what to compare it to. You can always improve! Buy it for him! :thumbsup:

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