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FZR250 to 400 Conversion

Discussion in 'FZR250.com - Archives' started by patch, May 28, 2005.

  1. patch

    patch New Member

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    Hi all,
    Has anybody done the 250 to 400 conversion. It's a 2kr model.
    I am also looking for a price and availability of a 400 engine. It seems to me that 400's are cheaper to buy as I'm told they were sold in Australia.

    I am told this conversion is quite common and there are adaptor plates available.

    Cheers
    Graham
     
  2. Muck

    Muck New Member

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    I may do the 250 to 400 convesion when the 250 engine in mine goes bang. It doesn't look too hard to do, and I know that the brakes are up to it on the 3LN.
     
  3. grendal

    grendal New Member

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    Interesting to see how a 2kr will handle with its nimble frame? lol
     
  4. Boz

    Boz New Member

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    the manual for teh 400 is around somewhere (in pdf) so perhaps you can look into that for sizes to see how compatible the frames are? (see <!-- m --><a class="postlink" href="http://p072.ezboard.com/fexupbrotherhoodfrm42.showMessage?topicID=2.topic">http://p072.ezboard.com/fexupbrotherhoo ... ID=2.topic</a><!-- m --> for a link to the 400 manual)
     
  5. patch

    patch New Member

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    Thanks guys. This was my sons bike, he's an apprentice motorbike mechanic. On the weekend he bought an trx850 with race cams and a killer (ducati type exhaust, Biiiggggg back rim tyre etc so I inherited the FZR250.

    This will be a fun project as I used to own a motorbike shop in my younger days in Canberra and raced a bike for many years.
    Plus I want to put this 400 in the 250 frame and give my son something to thing about with his 850...lol

    If you guys come across any more info on the conversion from a 250 to 400 engine let me know please

    Cheers
    Graham
     
  6. FZR Dude

    FZR Dude New Member

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    The 400 frame is soooooo much tighter. It truely was/is a race frame for the street.
     
  7. Boz

    Boz New Member

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  8. Darrel_b021

    Darrel_b021 New Member

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    im really sorry to open a very old thread... but is it really possible to convert a 250 engine to a 400 engine???
     
  9. FZR Dude

    FZR Dude New Member

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    The only way would be to transplant a motor. I doubt that there is enough cyl wall to bore out to a 400.
     

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