Yz426 with 03 yz450 sleeve and head. Possible?

Yamaha YZ426F

5 replies to this topic
  • MattyDubz426f

Posted October 01, 2014 - 09:03 AM

#1

Yz426 yz450 bigbore bolton 03yz450 stroker

  • grayracer513

Posted October 01, 2014 - 09:25 AM

#2

Is there a question?



  • MattyDubz426f

Posted October 01, 2014 - 10:19 AM

#3

Ok.... Is it possible to put the sleeve and head off of a 03yz450. Onto the yz426 motor. For big bore swap with no machining needed. And what timing chain to use

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  • grayracer513

Posted October 01, 2014 - 12:53 PM

#4

As I understand it, it's possible to adapt the gen1 450 cylinder and head onto a 426, but the bore is the same 95mm that the 426 is already, so even after all that work and expense, it won't be any bigger than it is now.

  • MattyDubz426f

Posted October 01, 2014 - 12:58 PM

#5

Is the stroke longer on a 450 than the 426??? Could that be a power advantage. Leaving the 426 lowerend and putting the 450 top end and piston n rod.

  • grayracer513

Posted October 01, 2014 - 02:48 PM

#6

...would do nothing.  The radial distance between the crank shaft and crank pin (where the rod goes) is what controls the stroke, not the rod length.  And no, a 450 crank will NOT fit a 426.







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