'99 YZ400 Frame work on a '01 YZ426?

11 replies to this topic
  • waterppk

Posted March 14, 2005 - 05:07 PM


I purchased a damaged 2001 YZ426 and need to get a new frame for it. I found a 1999 YZ400 frame that the seller says will work perfect for my 426. Just by looking at pictures they look like an exact match. Does anyone know if they are the same or not?

Thanks alot!


  • 02YZ426

Posted March 14, 2005 - 05:23 PM


The 2 frames have different part numbers according to yamaha. I doubt it would work, but its possible. If I were you, I would wait and get the proper frame and save the hassel. What happend to your frame anyway? If its cracked or bent a little, it can be repaired.

  • waterppk

Posted March 14, 2005 - 08:27 PM


The frame is crunched pretty well.

Anyone else have anything?

  • JohnBosson

Posted March 15, 2005 - 04:05 AM


It fits right in
I have a wr400 and dropped in a yz426 motor - it was a straight swop - no mods.
Then I fitted some 17" wheels and went super motard racing. :)

  • Fastest1

Posted March 15, 2005 - 05:13 AM


Are you getting the swingarm in the deal? Yes the motor will swap as stated above, however swingarm pivot size might be different and the linkage for the shock will probably have been revised. Just check part#'s on the swingarm pivot and linkages.

  • JohnBosson

Posted March 15, 2005 - 06:09 AM


I didn't have to modify anything - went straight in.
Frame 1998 - motor 2001

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  • waterppk

Posted March 15, 2005 - 06:25 AM


Thanks alot for the help guys, I'll call him today and have him measure the swingarm and shock mounts/pivots.

Thanks again!

  • Fastest1

Posted March 15, 2005 - 11:22 PM


The motors are the same castings throughout the years of the 400/426, but there were changes in swingarm pivot diameters, airbox mounting, linkages and a few other things. So if it is just the frame you are getting (not the subframe, swingarm, airbox, etc.) it might end up in a parts hunt but they should be readily available here in the classifieds or on Ebay.

  • Matt96xr6

Posted March 16, 2005 - 07:52 AM


swingarm did not change until 2002.

The frame geometry for the steering and suspension is better on the 426 than the 400. you will be taking a step backwards.

  • waterppk

Posted March 16, 2005 - 10:04 AM


Frame gets here on thursday and i plan on swapping everything over on friday. I'll let you guys know how it goes and whatnot. As far as geometry, i'll take the step backwards to be able to ride for a week over spring break. I'll be looking for the right frame over summer, but i didn't have enough time now to find a good one, but i had the money available to purchase the 400 frame now and find a 426 one later.

Thanks again for all the info!

  • waterppk

Posted March 21, 2005 - 06:22 PM


Everything switches fine between frames. The ONLY difference is that the frames have different cable guides up in front. :)

  • Matt96xr6

Posted March 21, 2005 - 08:55 PM


FYi, the 2002 426 casing are different from the 98-01. Reason, larger swing arm bolt.

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