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About Yz400fRiDa

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  1. I just purchased a brand new left over 09 kx450f a couple weeks ago and yesterday purchased a pro-circuit full system t4-R exhaust. I was just curious if I need to re-map the fuel injection or if it is recommended. They bike is stock except for the exhaust. Thanks in advance.
  2. This is my first post here. I was wondering what are some of the (if any) common problems with the 1999 yz400f. I currently own a yamaha warrior and atv's are getting kind of boring to me. I have prevously ridden dirt bikes so there is no problem. Thanks