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Popping and Backfiring when you let off the throttle

Discussion in 'All Terrain Vehicles' started by stucksucksnayota, Sep 20, 2010.

  1. Sep 20, 2010 at 6:07 PM
    #1
    stucksucksnayota

    stucksucksnayota [OP] Well-Known Member

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    Barry
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    OEM roof rack, Shorty antenna (eBay), soft tonneau cover, K&N drop in air filter, bed mat, interior LED lights, 5100's, MT tires to come soon!!!
    Got a quick question for anyone who would have an idea about this!

    I have a 2003 z-400 and it runs great doesn't burn any oil doesn't miss runs good! But ever since i bought it about 4 months ago it has popped and back fired any time you let off the gas. I thought it might have been the rusted through muffler on it so I bought a DG racing pipe from a guy off Craigslist that looks like its brand new and it seems to do it even worse now. I am running a 160 main jet cause it be popping and back firing because its running to lean or rich? Every where I've read they say I should be running a 175 but I havent had to time mess with it yet.

    Doesn't have an exhaust leak anywhere? Any thoughts or ideas of how to fix it cause its about to drive me nuts!
     
  2. Sep 30, 2010 at 1:22 PM
    #2
    Zombie Runner

    Zombie Runner Are these black helicopters for me?

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  3. Sep 30, 2010 at 1:27 PM
    #3
    emtlibby

    emtlibby Slaughtering goats

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    my old vw's used to do this whenever too rich, or timing off. Setting timing, cleaning my points, and a carb cleaning usually worked for me.
     
  4. Sep 30, 2010 at 1:47 PM
    #4
    TundraStop

    TundraStop Well-Known Member

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    too many to list really!
    Jet it you need larger jets! A pipe will help also!
     
  5. Sep 30, 2010 at 1:55 PM
    #5
    TundraStop

    TundraStop Well-Known Member

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    too many to list really!
    Thats the truth just by the jets they are like 3-8$ a piece
     
  6. Oct 1, 2010 at 4:56 AM
    #6
    FoxySandChick

    FoxySandChick Well-Known Member

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    I have a Z400 also ;)... that bike is bullet proof! Too bad I don't ride it anymore...

    I agree, sounds like you are running lean.
    Before you re-jet it upgrade the intake, we use k&n on everything. You might want to get that pipe re-packed since you don't know how long it's been used or when it was last serviced. Once you have the pipe and intake set up how you want then work on the jetting, its best to get the specs from a forum for the set-up you have and your location.
    Yup, buy a couple size jets up and down instead of the kit, much cheaper.
     
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