Do i Need to Re tune the bike?

I'am adding hot cams "exhaust & intake" , also new fmf pipe & exhaust to my yz426f. do i need to re-tune or re-calibrate soemthing? jetting,valve,ect.. need help! grr:banghead:

ya, anytime you change the flow it is not going to act right, i would also add a high flow air filter also, like a uni and follow these carb tuning instructions

http://www.4strokes.com/tech/4sjetting.asp

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