need help, 400f motor and 450f motor compatibility

2 replies to this topic
  • 400f mech

Posted April 24, 2009 - 08:09 PM


hey, i recently threw the rod in my 98 400f, was going to rebuild but then i found a 450f motor for cheep, i was wondering if the 450 motor would bolt into my 400f frame? the motor is out of a 04 yzf450 would appricate any help asap. thanks

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  • grayracer513

Posted April 24, 2009 - 08:35 PM


It may fit fairly well, although you'll probably need custom inserts made for the rear hard point to match the 400 swing arm.

But why not just buy a used '04 for $2k or less and save the hassle (to say nothing of newer, lighter, etc.,)?

  • 400f mech

Posted April 24, 2009 - 08:40 PM


would love to get a newer bike but i am only in highschool and have a tight budget, and i am also in process of building a cr500 trx250r hybrid so money is an issue, making inserts or modifying the frame is not a problem, many hours of using a mig and tig welder, thanks alot grey for the imput, looking foreward to getting the bike back together, been riding a rm125 in desperation

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