Yz426 with 03 yz450 sleeve and head. Possible?

[MattyDubz426f]

Yz426 yz450 bigbore bolton 03yz450 stroker

[grayracer513]

Is there a question?

[MattyDubz426f]

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

[grayracer513]

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]

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]

...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.