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Thread: 400EX Header on a 350X???

  1. #1
    Merge_88 is offline At The Back Of The Pack Arm chair racerAt the back of the pack
    Join Date
    Nov 2007
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    St. Louis area
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    262

    400EX Header on a 350X???

    So I used the search function for a few hours last night and really didnt get the info I wanted. I did find some threads mentioning it could be done, but didnt get any really good closeup shots of the modifications needed to make it work. Just wondering if anyone has some pics of a modded 400EX header and some tips/tricks to make this work. I would just get another 350X header but solid ones seem pretty far and few. By the way, please delete this thread if it is a topic that has been covered a 1000 times and I just didnt use the search correctly.
    Thanks
    1983 Honda 70
    1983 Honda 200
    1986 Honda "Super" 200X
    1983 Honda 250R
    1985 Honda 250R
    1985 Honda Big Red
    1986 Honda 350X/400EX conversion
    2005 Yamaha WR450F conversion
    1985 Yamaha Tri-Zinger
    1986 Kawasaki Tecate


  2. #2
    Join Date
    Jan 2009
    Location
    s. louisiana
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    38
    My 350x had a 400ex header and muffler on it when I bought it, when I started restoring it I had to cut one of the head pipes off by the jug to get it to come out. After that I found gouges on the frame where they pried it around to get it to fit.

  3. #3
    Join Date
    Oct 2002
    Location
    Northeast
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    17,460
    Unfortunately, you put in 400EX header and you get all kinds of crazy results.....

    They fit, there is some cut/refit/welding involved.

    We need to get the search feature fixed NOW!!!!!
    All our government does is distract us while they steal from us, misspend our tax $ and ruin our country

  4. #4
    Merge_88 is offline At The Back Of The Pack Arm chair racerAt the back of the pack
    Join Date
    Nov 2007
    Location
    St. Louis area
    --
    262
    Thanks guys, I think this is the route I am going to take Yes, the search doesnt seem to be functioning correctly.
    1983 Honda 70
    1983 Honda 200
    1986 Honda "Super" 200X
    1983 Honda 250R
    1985 Honda 250R
    1985 Honda Big Red
    1986 Honda 350X/400EX conversion
    2005 Yamaha WR450F conversion
    1985 Yamaha Tri-Zinger
    1986 Kawasaki Tecate


  5. #5
    TexFest's Avatar
    TexFest is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    Aug 2002
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    U.S.
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    339
    merge_88 i got a 400ex header if you need it
    TPC 450R

  6. #6
    Join Date
    Sep 2008
    Location
    Buffalo
    --
    808
    the search feature works poorly for me as well. I have a hard time finding Threads I started or threads I posted in. It worked fine before the upgrade to the new site. Now I can barely use it. On topic I am of no help with 400ex header.
    Tpc 450
    86 250r
    86 350x
    86 200x
    86 250sx
    85 225DR
    (2) 84 YTM
    (3) 85 Atc 70

  7. #7
    Join Date
    Jan 2007
    Location
    Masshole
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    2,191
    I got a full 400ex system on mine. There are a cpl things that need to be done to make it work correctly. Ill try to post pics of everything later today or tomm morn.

  8. #8
    junit's Avatar
    junit is offline At The Back Of The Pack Arm chair racerFirst time rider
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    Jan 2010
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    fremont ohio
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    154
    I have a 350x head pipe ill give you u just pay for shipping its not stock its a cobra header

  9. #9
    Join Date
    Apr 2008
    Location
    Kalamazoo, Michigan
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    814
    Bringing this thread back to life. I am also trying to use the search feature and it is not giving me optimal results.

    I want pictures, details, anything that can be useful to make this swap work better.
    Leave feedback for me here : [Please Don't start another thread again!]
    http://www.3wheelerworld.com/showthr...for-MagicJames

    Current :
    86 250SX
    86 350X
    86 250R Project

    Owned and Sold

    85 250R
    2 ATC70's 84 and 79

  10. #10
    mrtwidster1 is offline At The Back Of The Pack Arm chair racerFirst time rider
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    Nov 2007
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    tn. usa
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    169
    Quote Originally Posted by MagicJames View Post
    Bringing this thread back to life. I am also trying to use the search feature and it is not giving me optimal results.

    I want pictures, details, anything that can be useful to make this swap work better.
    Sasquatch, The 350x you rode at coal creek had the 400ex header. You remember? The one you got busted on by the Lady POPO? Yes, I did tell you the back brakes did not work!!!! LOL LOL!

  11. #11
    Join Date
    Oct 2007
    Location
    Grosse Tete, LA
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    3,440
    guys if you're cutting and fitting a new headpipe...you may as well do a little more work. SNag you an aftermarket 400ex headpipe. and right where the two pipes go into one, kick it up to around 2 inches or so.

    it'll flow.

  12. #12
    baycitysteve's Avatar
    baycitysteve is offline At The Back Of The Pack Arm chair racerFirst time rider
    Join Date
    Aug 2011
    Location
    baycity
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    199
    any one have a 350x cobra header i need one asap lmk thanks steve

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