YZ400-426-450f parts interchange

3 replies to this topic
  • Kawturbo1

Posted October 06, 2006 - 03:36 PM


I just acquired a 99' YZ400f.I was wondering if the 426 or 450 cylinder would fit on the 400.And what other parts are interchangeable.The bike I have had the piston hit a valve.I haven't got it apart yet to see exactly what is wrong with it.But any help would be great.

  • Florida_426

Posted October 06, 2006 - 05:27 PM


No to all the questions. You probably will be better off getting parts from ebay or some on line OEM parts service like Yamaha of Troy. Best of luck.


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  • Smokeslider

Posted October 06, 2006 - 09:02 PM


I had the same problem with a 98 400 about the head hitting a valve, it came down to a faulty top-end job that the dealer fixed for free do to the faulty top-end. The valve fell into the cylinder thus hitting the piston

  • Kawturbo1

Posted October 19, 2006 - 06:56 AM


Thanks for the info.After looking into it more closely I found the 426 head and piston can be interchanged with the 400.It cost very little.I got a 426 head off e-bay for 120 and the piston/jug for 80.Im going to send the crank out to have it stroked by 2.5mm and make a 440 out of it.I talked to a bunch of people and that have had it done and they say the differance is incredable.

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