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  1. YFZ450 & YFZ450R General Talk
    So I recently rebuilt my 2009 yfz450r. Almost every part of the motor was replaced I have a vortex ECU. Originally it was hard to start after the rebuild and it could not crank over fast enough. Eventually I got it running with the starter for a little bit but shut it off. Soon the after I...
  2. YFZ450 & YFZ450R General Talk
    i have a 14 yfz450r fuel injected. ever since i installed my new exhaust and intake, it sounds like an ak-47 once i let off the throttle 🤣🤣. the back firing is crucial. not wanting to spend 800$ on a vortex. could a power commander fix the back firing?
  3. YFZ450 & YFZ450R General Talk
    Whats up everyone i got a 2017 yamaha yfz450r se, the problem with my atv is sometimes when i turn it on its at a high idle and i ride but when i give it gas and let go it gets stuck for a couple seconds than it continues to idle at a high rpm, sometimes i turn it off and turn it back on and it...
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