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?

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

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