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Thread: 400EX won't start

  1. #16
    Join Date
    May 2002
    Location
    Southeastern Wisconsin
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    3,658
    Follow the arrow to the flat head screw on the bottom of the carb. Back that out until fuel flows out the spigot next to it. This is the chock side of the carb. Normally the yellow choke handle would be on this side.

    As far as the "exrta" fluids, just change the oil (drain bolt near the shifter and under the oil tank), change the oil filter, clean the air filter and get rid of the gas. The 400ex engine is one of the toughest out there.
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  2. #17
    Join Date
    Nov 2007
    Location
    Field, Ontario, Canada
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    63
    Yeah I changed oil and oil filter few weeks ago when did the plug. Unwrenching the plug for oil take it was cold so accidentally broke the whole tip off, had to get it welded again.
    Yeah I just went out today to see the carb and I remember that whole side. Thank you for the pic.

    Where is the spigot exactly, never heard of that sorry. Is it the brass looking one pointing leftward or the one coming straight outward with what looks to be a brass ballberring inside it.

  3. #18
    Join Date
    May 2002
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    Southeastern Wisconsin
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    3,658
    Quote Originally Posted by Chillyboarder View Post
    Where is the spigot exactly, never heard of that sorry. Is it the brass looking one pointing leftward or the one coming straight outward with what looks to be a brass ballberring inside it.
    Turn the screw out and look for the fuel. It should be running out a black hose on the spigot outlet on the bottom of the carb. Either way, you'll find it when the fuel starts running.

  4. #19
    Join Date
    Nov 2007
    Location
    Field, Ontario, Canada
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    63
    Ok, and any idea what that plug is on the direct bottom? Had taken it off last week thinking it would drain. Turned gas valve off but not much gas came out still. though still came out of it

  5. #20
    Join Date
    Jan 2003
    Location
    NE Arkansas
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    2,344
    That's the flaot bowl drain. You can access the main jet there also.
    36 yo, Apple geek, married with kids, conservative. If you are a GUN OWNER and not a member of the NRA, SHAME ON YOU! JOIN!

    Gun control is not about guns, it's about CONTROL!

    My Rags
    85 ATC70,85 ATC70,85 ATC110,83 ATC185S,85 ATC250ES,02 400EX,04 Polaris ATP 500
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  6. #21
    Join Date
    Nov 2007
    Location
    Field, Ontario, Canada
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    63
    My brother said if it's ice in the carb then I need to take the bottom plate off. That whole little bottom section where the drain screw is looks like what he might have mentioned. Is there alot of little parts of anything that'll fall out if I took that off?

    And I probable still need to take carb out to do that right, since so little space

  7. #22
    Join Date
    Jan 2003
    Location
    NE Arkansas
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    Sent you a PM back. Noticed your location, Canada. heheh
    36 yo, Apple geek, married with kids, conservative. If you are a GUN OWNER and not a member of the NRA, SHAME ON YOU! JOIN!

    Gun control is not about guns, it's about CONTROL!

    My Rags
    85 ATC70,85 ATC70,85 ATC110,83 ATC185S,85 ATC250ES,02 400EX,04 Polaris ATP 500
    Past rags:2000 Scrambler 400, 86 350X, 86 250R, 84 200S, 97 ATK260LQ

  8. #23
    Join Date
    May 2002
    Location
    Southeastern Wisconsin
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    3,658
    Quote Originally Posted by Chillyboarder View Post
    My brother said if it's ice in the carb then I need to take the bottom plate off. That whole little bottom section where the drain screw is looks like what he might have mentioned. Is there alot of little parts of anything that'll fall out if I took that off?

    And I probable still need to take carb out to do that right, since so little space
    Well water would be at the bottom of that bowl so if you did have ice you would have seen it in that cap you took off. I guess if it was mine I'd just take the carb off and check to see if everything was clean at this point. It certainly wouldn't hurt. Don't worry about getting in over your head, there isn't a bunch of loose parts in there.

  9. #24
    Join Date
    Nov 2007
    Location
    Field, Ontario, Canada
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    63
    Yeah but I seem to screw things up sometimes. And it scares me, not having anyone else to go to if something did go wrong.

    Doing it in a cold ass shed with few tools would just make me more nervous.

    I really want to take it apart, one career I might go into is a mechanic, I love watching my dad fixing anything and such, being in a nice warm garage getting all greasy is just my thing.
    My brother is coming up for a couple days at the end of march, if I don't have done by then I'll have to get his help.

    Could you tell me how many connects go to it exactly? And all I would need to do is take apart side plastics and top middle one, right? Then take off the few connections and bring the carb inside and tinker away. Is there anything else?

    I'm off for the night, nearly 11:30, talk to you guys in the morning!
    Last edited by Chillyboarder; 02-15-2008 at 12:20 AM.

  10. #25
    Join Date
    May 2002
    Location
    Southeastern Wisconsin
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    Quote Originally Posted by Chillyboarder View Post
    Yeah but I seem to screw things up sometimes. And it scares me, not having anyone else to go to if something did go wrong.

    Doing it in a cold ass shed with few tools would just make me more nervous.

    I really want to take it apart, one career I might go into is a mechanic, I love watching my dad fixing anything and such, being in a nice warm garage getting all greasy is just my thing.
    My brother is coming up for a couple days at the end of march, if I don't have done by then I'll have to get his help.

    Could you tell me how many connects go to it exactly? And all I would need to do is take apart side plastics and top middle one, right? Then take off the few connections and bring the carb inside and tinker away. Is there anything else?

    I'm off for the night, nearly 11:30, talk to you guys in the morning!
    Cold ass shed........... I can relate to that! PM me tomorrow and I'll step you through it when I get back. I might be able to get you a pic or two also.

  11. #26
    Join Date
    Jan 2003
    Location
    NE Arkansas
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    2,344
    http://www.exriders.com/vbb/showthre...hreadid=221742

    try that, should help.

    Also, be very careful jumpstarting it from a truck, I've heard of damage being done from that. I would not have the truck running if I had to jump it that way. Charge your battery up before you try to start it would be better.

    Let us know what jets are in there and how the carb looks.
    36 yo, Apple geek, married with kids, conservative. If you are a GUN OWNER and not a member of the NRA, SHAME ON YOU! JOIN!

    Gun control is not about guns, it's about CONTROL!

    My Rags
    85 ATC70,85 ATC70,85 ATC110,83 ATC185S,85 ATC250ES,02 400EX,04 Polaris ATP 500
    Past rags:2000 Scrambler 400, 86 350X, 86 250R, 84 200S, 97 ATK260LQ

  12. #27
    Join Date
    Nov 2007
    Location
    Field, Ontario, Canada
    --
    63
    lol I charge my battery all the time, it dies pretty quick. Booster on it helps it stay at a quick speed. It shouldn't hurt from a truck if it's still a 10v. (10v is the right size right?)
    Though I suppose some trucks could easily have more.

    It looks like a glorious day today, sun is out and clear blue sky. I have to go shovel some snow for an hour though, more or less.

    Will it say the jet size on them?

  13. #28
    Join Date
    May 2002
    Location
    Southeastern Wisconsin
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    3,658
    12v and it's the overload of extra amps that you should be worried about. You won't fry your electric system but you may burn up the starter.

    The jets will be labeled right on them. The size doesn't really matter as far as your current problem goes, it ran before with them it should run now. Just make sure they are clean.

    Did you get rid of that gas and change that plug yet?

  14. #29
    Join Date
    Nov 2007
    Location
    Field, Ontario, Canada
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    63
    I do not have a thin walled wrench to fit in there for plug

    Could you tell me the exact size I need for the plug? I'll try and ask neighbor when go to shovel.
    Last edited by Chillyboarder; 02-15-2008 at 12:31 PM.

  15. #30
    Join Date
    May 2002
    Location
    Southeastern Wisconsin
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    Quote Originally Posted by Chillyboarder View Post
    I do not have a thin walled wrench to fit in there for plug

    Could you tell me the exact size I need for the plug? I'll try and ask neighbor when go to shovel.
    18mm I believe.

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