Do I have a 426 or 400?

9 replies to this topic
  • alex_naumov1

Posted November 02, 2015 - 08:53 PM


So I bought an 01 yz426f and I googled the vin one day and I saw links with both yz426 and yz400.. And I was wondering if there is anything I can find on the bike to make sure what model it is. Thanks

  • slotracer577

Posted November 02, 2015 - 09:10 PM


Cylinder should have the cc on it. Don't remember the real differences. I think the carbs are different.

  • Islay426

Posted November 02, 2015 - 11:19 PM


if you can't figure it out and are desperate, they have different clutches. just take the clutch cover off and if the basket has solid "fingeres" then it's a 426, if it has "V"ed ones then it's a 400.

  • grayracer513

Posted November 03, 2015 - 07:16 AM


To begin, the 10th VIN character is the year model of the frame. W, X, & Y are '98-'00, and 1 and 2 are '01 & '02.  The '98-'99 were 400's, '00-'02 were 426's (unless you have a WR, which are the same except the 2000 WR was still a 400.


That's not definitive, because a 400 will drop directly into an '01 or earlier 426 frame.  So, on the front of the cylinder, at the bottom edge near the right side, the engine size is cast in.  It will either say 399cc or 426cc.  


But again, it's hard to tell because the 426 top will fit on a 400 with a little fiddling, so then what?  If it's a 400, the clutch pressure plate will have 5 springs, the 426 clutch has 6. 


Also, on a 400F, the hot start control is mounted to a tab on the frame by the air box, with a hose running to a barb on the intake port at the head, while the 426 carb has the hot start built in; it has a red knob like the choke pull knob on it.

  • alex_naumov1

Posted November 03, 2015 - 01:03 PM


The year code is 01 and I have a red hot start knob next to the choke built into the carb. So it's most likely the 426 correct?

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  • alex_naumov1

Posted November 03, 2015 - 01:06 PM


I finally found the displacement casting and its the 426 whew! I was worried I was lied to all this time!

  • Goonyz400f

Posted November 05, 2015 - 06:55 PM


I know that a 400 will have to code 5be all over the bike like on the kick start,carb,engine,brakes

  • grayracer513

Posted November 06, 2015 - 07:46 AM


I know that a 400 will have to code 5be all over the bike like on the kick start,carb,engine,brakes


As will a YZ250F and  YZ426.  A lot of 5BE parts were carried over for a while.  

  • Goonyz400f

Posted November 06, 2015 - 01:31 PM


Oh damn haha

  • skthom2320

Posted November 07, 2015 - 01:05 PM


Actually, a YZ400 would be a good bike to have just from a collectors point of view. These are the bikes (YZ400 and YZ426) that started the 4 stroke revolution. I had an '01 YZ426 and it is still one of the favorite bike I've ever had.

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