Engine swap

5 replies to this topic
  • Y4a5m0afha

Posted April 30, 2013 - 01:03 AM


I need to find out if a yz450f 2006 motor will fit in a yz450f 2005 frame.

  • motofella

Posted April 30, 2013 - 01:33 AM


No it wont unfortunantly , the 2005 model has a steel frame and the 2006 was the start of the aluminum frame, wich are compleatly different.

  • grayracer513

Posted April 30, 2013 - 06:38 AM


The rear and lower hard points line up, but because the cylinder on the '06-'09 is more upright, I think you'd run into some serious carb clearance problems.

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  • Y4a5m0afha

Posted May 01, 2013 - 01:37 AM


The reason for the question is I want some more grunt out of my bike like a big bore kit and stroker kit which goes in 06 model but not 05.

  • Geoffit

Posted May 01, 2013 - 05:13 AM


Well there are big bores for the 05 and Falicon in Florida still lists stroker cranks for the 05s as well

  • grayracer513

Posted May 01, 2013 - 06:58 AM


Luke's Racing will build your existing cylinder (or exchange it) into a 478. Piston availability is no problem. Stay with the '05 engine.

BTW, if you are running the stock ignition on an '05, you can get a massive improvement in low end grunt by using either an '04 or an '06 CDI. The '04 will produce the bigger low/mid hit, while the '06 will rev better, but either will improve the performance of the stock unit.

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