07 WR450f deceleration popping

5 replies to this topic
  • Andot09

Posted June 09, 2009 - 03:36 AM


Hi, my new (second hand) Wr450f has an annoying, loud pop noise as i decelerate. It only seems to happen for the first 20-30mins of a ride even after i let it warm up for 5ish. The baffles have been removed from the exhaust. I was wondering if anyone knew how to stop this as it is extremely annoying.

  • ww44wrf450f

Posted June 09, 2009 - 04:41 AM



try this link see --- grayracer513 link? give him some gas :thumbsup:

  • KennyMc

Posted June 09, 2009 - 08:28 AM


Does the Australian bike have the AIS on it?

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  • Andot09

Posted June 09, 2009 - 10:56 PM


Hey thanks for the link and no the australian bikes dont have AIS. After reading from the link i still cant understand why it stopped as it got later in the day?

  • ranger85

Posted June 10, 2009 - 08:22 AM


If it goes away later in the day, or after the bike is real good and hot, than it sounds like you are a little lean on your pilot. It's getting hotter in the day, thus richening the mixture. Try going up a size on your pilot jet and set the fuel screw to 1 1/2 to 2 turns out.

  • Andot09

Posted June 11, 2009 - 02:47 AM


Thanks for the help, ill give that richer pilot jet a go because it sounds logical. I have a feeling a richer one came with the bike anyway. Thanks


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