gray wire mod question

I just bought a 2000 wr400 and I am putting a fmf powercore 4 pipe on it, should I cut that gray wire? also do I need to jet it after I put the pipe on? I haven't been riding for 8 years so im not up to snuff on jetting and the new style bikes.

How do you know it hasn't been cut or pulled yet?

http://thumperfaq.com

Read and learn. Pretty much what applies to the 250f applies to the 400, 426, and 450

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