cam chain pitch changed? with what model year?

3 replies to this topic
  • WRF-Rowdy

Posted April 25, 2015 - 10:35 AM


Hear the rumor that the cam chain pitch changed so that one should be careful which YZ-cam he sticks into his WR.


With what model year did WR resp. YZ use a different cam chain pitch?



My plan is to buy a '06 YZ450F cam and put it into my '12 WR450F.



edit: case closed. the cam chain is identical between '12 WR450F and '06 YZ450F, hence the sprockets must be interchangable.




Edited by WRF-Rowdy, April 25, 2015 - 10:54 AM.

  • stevethe

Posted April 25, 2015 - 11:07 AM


No such rumors. A hot cam works from 03-13 WR450. Cam chains are the same.
The issue you may have is with the decompression pin. Rumor has it you can grind it down a millimeter to make it start friendlier with your electric starter when cold.

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  • Pooley

Posted April 25, 2015 - 05:14 PM


Actually, the cam chain pitch DID change with the change in displacement from 426 to 450.  2003 to ?? model year cams from a 450 do fit in a 426, but the gear pitch is different. 


So, only half a rumor :).

  • Geoffit

Posted April 26, 2015 - 01:31 PM


The 400's used the chain width like the 250 I put a 450 exhaust in a 400 ( to get the auto decompress) and used a 250 sprocket worked like a charm. I've put the yz exhaust in a couple of WRs with the pin as is and they e- start with no issues FYI ,


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