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Thread: 04, 400ex smoking

  1. #1
    Join Date
    Feb 2008
    Posts
    24

    04, 400ex smoking

    i have a 2004 honda 400ex my first quad, i noticed its starting to smoke, i know theres something wrong but not sure what. someone told me to use a heavier oil , 15w50 is that a good choice, or do i have to rebuilt the engine, if anyone has any tips that would be great thanks, Matt

  2. #2
    Join Date
    Aug 2007
    Location
    S. La.
    Posts
    79
    Is it smoking all the time or just after you start it and it stops after warm up? If it stops that's pretty normal for 400ex's but if it is all the time then you might have a problem.

  3. #3
    Join Date
    Feb 2008
    Posts
    24
    no it seems to be smoking all the time worse when i first start it but it does smoke all the time, its gotton worse since i first noticed it about a couple months ago

  4. #4
    Join Date
    Oct 2007
    Posts
    313
    i think you need new rings... have a video to show us?
    2001 300EX
    FMF Powercore4 Full
    (no spark arestor)
    20x11x9 Holeshot HD's
    Uni Filter (no lid)
    ProTaper bars
    14t front

  5. #5
    Join Date
    Feb 2008
    Posts
    24
    how do i get ahold of this video, its something i would do myself and having a video to help would be great

  6. #6
    Join Date
    Oct 2007
    Posts
    313
    Originally posted by matthewb20
    how do i get ahold of this video, its something i would do myself and having a video to help would be great


    Dude i was asking if he had a video lol my bad
    2001 300EX
    FMF Powercore4 Full
    (no spark arestor)
    20x11x9 Holeshot HD's
    Uni Filter (no lid)
    ProTaper bars
    14t front

  7. #7
    Join Date
    Feb 2008
    Posts
    24
    i went to the local honda dealer and they told me it was going to cost 1100.00 bucks to rebuilt the engine and replace the piston and rings, thats bull****

  8. #8
    Join Date
    Feb 2008
    Location
    MD
    Posts
    692
    dam dude im also getting rings, piston, valves, from a frined who works at a dealer is doing it on the side i ll let yz know how i make for tout but 1100 for just rings id be breaking out the maunel and doing it myself hat , i thought i needed just rings not all this other work SURPriZ
    06 ktm300 xcw: trail weapon

    99 400ex:
    .FMF megamax
    .FMF powerbomb header
    .10/1 wiesco pistion
    ,protaper se bars
    .Uni filter
    .nerf bars

    Faster, faster, faster, until the thrill of speed overcomes the fear of death…
    - Hunter S. Thompson

  9. #9
    Join Date
    Feb 2008
    Posts
    24
    well the dealer said that would be worst case, replacing more than rings, think he also added valves piston rings cam everything, he didnt give me a price for just rings, i wish i knew someone that could do it on the side

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