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Thread: 400ex frame with yz426 conversion????

  1. #1
    Join Date
    May 2006
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    Georgia
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    129

    400ex frame with yz426 conversion????

    i was about to buy a frame that has the 426 conversion in it but i was wondering can a yz400f and yz450f engine in it. Or will it just fit the yz426f engine.

    And how much horsepower does this motor produce stock does anybody have a clue.

  2. #2
    Join Date
    Feb 2005
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    PA
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    3,552
    i was told that the 426 has a little more hp and alot more torche. idk about the conversion kit i would talk to the guys at jb racing
    04 dodge cummins 6 speed
    Houser crf hybrid
    08 trx450r

  3. #3
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    May 2006
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    Georgia
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    I would greatly appreciate it.

  4. #4
    Join Date
    Apr 2006
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    Alberta, Canada
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    The YZ426F and the YZ400F have the same motor mounts but i'm not sure about the YZ450F. The YZ400F and the YZ426F are pretty much the same engine besides the bore the piston pin and the connecting rod and diffrent crank bearings.

  5. #5
    Join Date
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    Georgia
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    But which would be best for trails.

  6. #6
    Join Date
    May 2006
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    NJ
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    Originally posted by atownswhizkid
    But which would be best for trails.

    the 426 or 450 because they have more torque than the 400. the 426 is plenty motor for trails. i would leave it as is.
    2009 KTM450XC.

  7. #7
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    Apr 2006
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    Alberta, Canada
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    I think any of the YZF engines will work good for trail riding.

  8. #8
    Join Date
    May 2006
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    NJ
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    4,698
    Originally posted by LT250RMan
    I think any of the YZF engines will work good for trail riding.

    ya, but the 450 motor hits so hard(only the ones before '06 do this) that is almost too much for anybody but a pro racer to handle in the woods.
    2009 KTM450XC.

  9. #9
    Join Date
    Jul 2006
    Location
    north central US
    Posts
    4,305
    why do the 06 and older hit hard? why isnt it hte newer ones?
    Originally posted by BakerRacing40
    bad thing is she's probably been rode harder than half the bikes in the start gate..

    but you can still have fun with somethin that's a lil worn out...

    RIP John Gallagher Sr

    give him a blessing or two... god bless this rider and all fallin riders..
    http://www.metalmulisha.com/team/jeremy-lusk

    250r... the G.O.A.T of quads...

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