YZ426 to 450 Cylinder swap

2 replies to this topic
  • BuckHopkins

Posted February 10, 2007 - 06:06 PM


Has anyone sucessfully swapped a 450 cylinder into a 426? i have a 426 that i love but would like more power out of it! (i'm getting fat in my old age)

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  • Pincushion

Posted February 10, 2007 - 06:39 PM


Punch the stock jug to accept a 97mm piston and you'll have a 444. Much easier than grafting a 450 jug to a 426 lower end. Dont expect miracles though.... your 426 isn't too far off the 450's as it sits stock.

  • j753301

Posted February 10, 2007 - 11:14 PM


the difference between the 2 is the stroke not the bore.the 426 and the 450 have the same 95mm bore so putting the 450(63.4mm stroke) on the 426 (60.1mm stroke) will do nothing.

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