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cam shafts

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Yes you can. I put my 06YZ450 Ex. cam into my buddies 01 YZ426 over 2yrs ago and it still works great. Don't worry about the alignment dots on the Ex. Cam. Make sure the lobe is facing out.

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If you use a cam originally made for a YZ450, you'll have to use a modified timing procedure:

 

http://www.thumpertalk.com/topic/56257-yz-450-cam-mod-please-read/page-49#entry2979654

http://www.thumpertalk.com/topic/56257-yz-450-cam-mod-please-read/page-53#entry4458141

 

You're currently both money and ease of installation ahead to use a cam by Hot Cams or another aftermarket source that was built with the same auto decomp system but made expressly for a 426.  With that, you simply drop it in as if it were stock.

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