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Thread: Please help 300ex sputters

  1. 07-31-2001, 08:20 PM #1
    Nate's96 300ex
    Nate's96 300ex is offline Senior Member
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    Please help 300ex sputters

    I have installed a k&n jet kit on my 300ex and running no airbox lid with a fmf performax pipe and when im in like 3rd gear and its almost WOT and then I slowly let off the throttle it starts to like bog out until i let the throttle off or give it more this only happens in 3rd gear also if I like try to push the throttle in and out very quickly it does this it alos does it when I really wnat to take off and get wide open it might do it once WHAT THE PROBLEM
    Wiseco 11:1 bored .080 Piston, TC rev box, FMF Performax full Exhuast System, K&N air filter, Outerwears Prefilter, Custom air box lid, 400ex carb, DG jets, Removed choke Plate, Cometic Gaskets, Custom oil cooler, Sidewinder gearing 14-37,
    LoneStar Billet Bearing Carrier, RK racing chain, Pure Sport Realtor on douglas .190, Titan Fast Trekker front tires, Shockwears shock covers, Ceet Graphics kit, Dg grab bar
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  2. 07-31-2001, 08:36 PM #2
    400exRacerX's Avatar
    400exRacerX
    400exRacerX is offline Sick Style ATV Racing
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    check for any air leaks in your pipe, when i got my new pipe i had a air leak causing it to backfire on deccel, and my friends 400 was sputering when ever he hit the throttle and that was caused buy a bad connection to the spark plug cap.
    #71
    2000 Roll/Laeger's/Houser/Axis 416ex

    2001 Arens/Laeger's/PEP 250r

    Thanks to my sponsors for 2003 : 00-Buck ATV Racing, Team Pompton, Nebulae Race Team, Milton Inn Packaged Goods, Napa Auto Parts of Oak Ridge, Sick Style Racing, WD-40, Hinson Racing, IMS, Sport Center Racing, and Nac's racing

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  3. 07-31-2001, 08:39 PM #3
    Nate's96 300ex
    Nate's96 300ex is offline Senior Member
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    the pipe is fine but i might have to check that spark plug it never use to do it but like maybe a couple of time when i installed it then it stopped now its doing it could it be the air/fuel mixture screw I have messed with that a little???
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  4. 07-31-2001, 08:43 PM #4
    400exRacerX's Avatar
    400exRacerX
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    yea it could be the screw i never messed with mine, you will have to get it back to stock settings and go from there. it might be the plug though, because most people pull there spark plug cap off by the wire WHICH YOU ARE NOT SUPPOSED TO DO and it loosens the wire after a while and it makes the connection bad.
    #71
    2000 Roll/Laeger's/Houser/Axis 416ex

    2001 Arens/Laeger's/PEP 250r

    Thanks to my sponsors for 2003 : 00-Buck ATV Racing, Team Pompton, Nebulae Race Team, Milton Inn Packaged Goods, Napa Auto Parts of Oak Ridge, Sick Style Racing, WD-40, Hinson Racing, IMS, Sport Center Racing, and Nac's racing

    I'd also like to give a special thanks to Baldwin Motorsports for all there help and support they gave me.

    We are now accepting resumes, this is a New Jersey based team. westsyder50@hotmail.com
    http://www.geocities.com/sickstyleatv/index.html

    Team Rcokford Fosgate 401+ northeast champ 147.7db
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  5. 07-31-2001, 08:45 PM #5
    Nate's96 300ex
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    so what will I have to do if it is that wire get a new one???
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  6. 07-31-2001, 08:49 PM #6
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    4punksdad
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    Originally posted by Nate's96 300ex
    so what will I have to do if it is that wire get a new one???
    no....the spark plug cap just screws onto the end of the wire...........righty tighty, lefty loosey....

    also check to make sure the intake boot is still connected to the carb properly.........sounds like an air/fuel mixture problem to me.
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  7. 07-31-2001, 08:53 PM #7
    Nate's96 300ex
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    ill try that to man this really sucks what would happen if i just ignored it but i wont im just wondering
    Wiseco 11:1 bored .080 Piston, TC rev box, FMF Performax full Exhuast System, K&N air filter, Outerwears Prefilter, Custom air box lid, 400ex carb, DG jets, Removed choke Plate, Cometic Gaskets, Custom oil cooler, Sidewinder gearing 14-37,
    LoneStar Billet Bearing Carrier, RK racing chain, Pure Sport Realtor on douglas .190, Titan Fast Trekker front tires, Shockwears shock covers, Ceet Graphics kit, Dg grab bar
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  8. 07-31-2001, 08:54 PM #8
    Nate's96 300ex
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    I also have taken the choke plate off
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  9. 07-31-2001, 08:55 PM #9
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    400exRacerX
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    now this is slowing looking to be a carberation problem to me, but still check the cap, u never no
    #71
    2000 Roll/Laeger's/Houser/Axis 416ex

    2001 Arens/Laeger's/PEP 250r

    Thanks to my sponsors for 2003 : 00-Buck ATV Racing, Team Pompton, Nebulae Race Team, Milton Inn Packaged Goods, Napa Auto Parts of Oak Ridge, Sick Style Racing, WD-40, Hinson Racing, IMS, Sport Center Racing, and Nac's racing

    I'd also like to give a special thanks to Baldwin Motorsports for all there help and support they gave me.

    We are now accepting resumes, this is a New Jersey based team. westsyder50@hotmail.com
    http://www.geocities.com/sickstyleatv/index.html

    Team Rcokford Fosgate 401+ northeast champ 147.7db
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  10. 07-31-2001, 08:59 PM #10
    Nate's96 300ex
    Nate's96 300ex is offline Senior Member
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    yea prolly is so first i will mess with the air/fuel screw im pretty sure thats prolly it if thats not it then what
    Wiseco 11:1 bored .080 Piston, TC rev box, FMF Performax full Exhuast System, K&N air filter, Outerwears Prefilter, Custom air box lid, 400ex carb, DG jets, Removed choke Plate, Cometic Gaskets, Custom oil cooler, Sidewinder gearing 14-37,
    LoneStar Billet Bearing Carrier, RK racing chain, Pure Sport Realtor on douglas .190, Titan Fast Trekker front tires, Shockwears shock covers, Ceet Graphics kit, Dg grab bar
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