wr426cam for yz426

6 replies to this topic
  • Thumper728

Posted December 05, 2004 - 04:43 PM


I have been reading the other threads cant get the strait scoop
I want to make the yz more user friendly in the woods
I saw something about a auto decomp what is that about,
also would the milder cam and heavier flywheel be the way to go

  • Matt96xr6

Posted December 05, 2004 - 05:09 PM


The 426 has the same cam in the Wr and YZ. The timing is different.

Now the 450 uses different cams and different timing. Your best bet is a heavy flywheel weight and an autodecomp cam.

  • Thumper728

Posted December 05, 2004 - 05:17 PM


with the decomp cam do I need to replace both cams
and I wonder which flywheel weight would be the best.
who is the best source for the cams

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  • Fastest1

Posted December 05, 2004 - 08:15 PM


You will just need the exhaust cam from either a WR or YZ 450. The cams are different on the 450's so if you want low end torque, get the Wr cam. The YZ cam cant be timed differently like you could on the 426. Try the cam first, then a weight if you need it. It will help alot.

  • Dano426

Posted December 06, 2004 - 07:21 AM


The 03 450 exhaust cam will help with starting and add some low end torque. I installed one last year and it works great for the starting issues. I had a 12oz flywheel on my bike and liked it a lot, until I installed a Rekluse Z-start auto clutch. Take a look at a Z-Start - It is by far the best money ever spent! :cry:

If you are looking for a flywheel I have a 12oz steahly for sale. PM me

  • RogerDedrick

Posted December 06, 2004 - 07:47 AM


with the decomp cam do I need to replace both cams
and I wonder which flywheel weight would be the best.
who is the best source for the cams

I have used the WR450 exhaust cam in my 426 this year. It is a large imnprovement over the stock YZ cam for the woods. It really pulls right off idle very strong and is fairly linear all the way up. It is worth it just for the ease of starting as well.

  • Thumper728

Posted December 07, 2004 - 02:46 PM


ok now which cam to get the wr450 or the yz450 cam

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