WR Trans in YZ426?


5 replies to this topic
  • Yammer-Hammer

Posted February 25, 2014 - 07:17 AM

#1

I imagine that the WR426 tranny interchange without a problem but what about like a WR450 tranny? Does anyone know if either of these are compatible and a direct swap into a YZ? I feel the gears on my 426 are to damn close together, it blast thru 1st thru 4th like its nothing

  • grayracer513

Posted February 25, 2014 - 07:58 AM

#2

None of the 450 transmissions will interchange with any of the 426's. 

 

An alternative to the either/or situation presented by the question of which trans to use is mixing ratios from one to the other.  I installed the 4th and 5th gears from a WR450 in my '06 YZ450 to give it longer legs for desert races.  I still have a close ratio 1-3, and the first 4 gears are an exact duplicate of the ratios in an '03-'05 4 speed, plus the WR 5th.  Something to give some thought to.



  • Yammer-Hammer

Posted February 25, 2014 - 12:01 PM

#3

Whats the difference in ratios between a wr426 5th and yz426 5th?

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  • grayracer513

Posted February 25, 2014 - 01:24 PM

#4

WR is .840 vs. .952  or 14% higher

 

WR426:

2.416
1.733
1.312
1.050
0.840

 

YZ426
1.846
1.533
1.278
1.091
0.952

 

YZ450 4 speed (for reference):
1.929
1.563
1.278
1.050



  • Yammer-Hammer

Posted February 25, 2014 - 02:35 PM

#5

Looks like im going to change out 4th and fifth in my yz with 4th and 5th from a wr, i like those ratios. Does anything have to be done with the shift forks or the shift drum?

  • grayracer513

Posted February 25, 2014 - 04:21 PM

#6

Nothing.







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