426 Questions.

[fastrnrik]

I have been looking around for a hybrid and have found a good deal on a Walsh with the Yamaha 426 motor. I've ridden a CRF450 hybrid, but I've never messed with the 426's and I don't know much about these motors, so I'm hoping some of you guys can give me some info on them.
*pro's/con's?
*weak links, known problems?
*any big bore cylinders available? seems I've heard of them being bumped to a 444? I may be wrong?
*parts interchangability with other YZ motors?
*power? The motor will be professionally built. It will be strictly a race motor. The bike will be TT raced against some modern production 450's with healthy motors. If the 426 ain't worth messing with or won't hang, then I would probably want to switch over to a CRF450 motor.
*any other thoughts or input?

Any help would be appreciated. Thanks.

[hskers82]

pm jrspawn on here.he has built quite a few 426 hybreds

[g9901920]

426'S ARE GREAT! they work better at 426cc's becuase they are high RPM engines. They have plenty of power, and there's no doubt that they can handle any 450 you throw at them! They really are great flattrack engines because of there power-band being higher in RPM's.
good luck!

[vinny casta]

426 revs nice and the are so reliable i think. im selling my hybrid if you are intrested. all gibson with the 400ex conversion 426 in it built by east coast will send pics. nothing stock except for gas tank