07 YZ450F Sputtering

13 replies to this topic
  • Yamaha Nemesis

Posted September 09, 2008 - 11:50 PM


When I have the throttle held steady on my YZ450F it sputters. It accelerates and runs fine but its just when I'm holding it steady it sputters and I can feel the bike jerk. Its not severe but it has me concerned. I wanted to know if this is normal or is there something wrong?

  • DBMX 925

Posted September 10, 2008 - 12:01 AM


Did you adjust the fuel screw? I'd start there.

  • grayracer513

Posted September 10, 2008 - 06:26 AM


If the sputter is still present after you get the idle mixture correctly set, try lifting the needle one position.

  • Yamaha Nemesis

Posted September 10, 2008 - 08:50 PM


I adjusted the fuel screw and still have problems. My friend and I are going to adjust the needle. I have read that other people have had this problem. Has anyone found a definite solution?

  • Aka.Goose

Posted September 10, 2008 - 11:08 PM


definite solution = ZipTy carb mod

  • fulltaps

Posted September 10, 2008 - 11:32 PM


My 06 YZ 450 has always done the same. If she is not accelerating, she jerks the same way. I always just thought these bikes were made to constantly be on the power and are not happy putting around..!! Get on the gass and solve the problem !!

  • Yamaha Nemesis

Posted September 13, 2008 - 06:14 PM


Will riding with the sputtering damage the bike?

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  • grayracer513

Posted September 13, 2008 - 07:59 PM


I'm curious. Are you guys among those using fattened up jetting in order to get rid of every last trace of decel popping, or something?

  • Yamaha Nemesis

Posted September 13, 2008 - 08:51 PM


I just bought my bike and it is all stock

  • mikedabike

Posted September 14, 2008 - 07:20 AM


I got rid of the sputter by getting rid of the too big pilot everyone was recommending. Went back to stock and dialed in the fuel screw and it pretty much went away.

  • Yamaha Nemesis

Posted September 15, 2008 - 11:34 AM


I'm running 93 gasoline in my bike. I thought about using 94 to try to get rid of the sputtering. Would this work?

  • grayracer513

Posted September 15, 2008 - 01:26 PM



A change in fuel might do it, and it might happen that the higher octane fuel would be the one that would run better, it's just as likely that the lower octane fuel would. Octane relates ONLY to the anti-knock index, and to nothing else.

  • WB450

Posted September 16, 2008 - 08:47 AM


definite solution = ZipTy carb mod


  • WillC751

Posted August 23, 2011 - 05:39 PM


My 07 450 has been sputtering also. As im going through the gears its just not the same it kicks and sputs as i twist the throddle its verry frustrating. my bike is all stock also.

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