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Thread: 400EX Won't Start

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  1. #1
    Join Date
    May 2013
    Location
    Central KY
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    31

    400EX Won't Start

    So I'm trying to help my brother in law out with his '05 400EX. It died while riding it and now won't start. I thought a spark plug would be a quick and cheap idea so I changed that and still nothing. The starter is spinning and the starter clutch is catching because I could see the piston moving while I had the spark plug out. I'm thinking it's something in the electrical system but I'm not great with electrical stuff. What should I check next? Any help is greatly appreciated.

  2. #2
    Join Date
    Jul 2013
    Posts
    366
    I'm sure you've already checked but does it have gas? Lol but it sounds like electrical to me Check the fuse back by the battery
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  3. #3
    Join Date
    May 2013
    Location
    Central KY
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    Sadly, it has gas. When he told me it wouldn't start, the first thing I checked was the gas.

  4. #4
    Join Date
    Sep 2012
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    177
    check to see that the plug is sparking. put it in the wire and hold the "finger " on the header. thwn turn it over and watch for a spark at the tip. if it has spark check compression, incase you dont have a compression tester that will fit i reccomend harbor freight. they have a 3 piece compression tester with interchangeable sizes. they are 30-40$
    2003 400ex
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  5. #5
    Join Date
    Dec 2010
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    Quote Originally Posted by Drifterboy3 View Post
    check to see that the plug is sparking. put it in the wire and hold the "finger " on the header. thwn turn it over and watch for a spark at the tip. if it has spark check compression, incase you dont have a compression tester that will fit i reccomend harbor freight. they have a 3 piece compression tester with interchangeable sizes. they are 30-40$

    Yes...check if it has spark. If it does, put plug back in and throttle it a bunch like your trying to flood it while hitting the start button....now take out the plug, it should be wet with gas....if the plug is dry your not getting gas. You cab also shoot a little gas down the plug hole and if it has spark it will ignite and run a split second. Let us know if you have spark and gas.
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    2001 Honda/KTM 520 Hybrid Quad. Its like a 400EX but twice the horsepower.
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  6. #6
    Join Date
    May 2013
    Location
    Central KY
    Posts
    31
    Will check it this afternoon when I get in from work. Good place to start. Thanks guys. I'll let you know what I figure out.

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