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ncmountainman

05 exhaust cam

11 posts in this topic

i'm considering putting a yz exhaust cam in my 04 wr450 my ? is ,did the 05 cam change profile for more bottom end (they seem to mention it in the brochures that the 05 has improved bottom) and if so will it fit in the 04 head?? :cry: thanx.....bob

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I haven't run a degree wheel on an '05, but I believe that the lobe profile on both engines is the same. What I think is different is that the timing of the cam has been shifted so that the power comes on later, and doesn't hit so hard at low RPM. Doug Dubach has be doing this for a while, and will re-time your cam for you. See http://www.dubachracing.com/products.aspx?lCatID=13#75

When Yamaha says the '05 offers "smoother" low speed power, I don't think "more" is what they mean. They mean a little less to start with, then a more gradual transition to the meat of the power.

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great, so the only way to get "more" bottom end power is to just go with the 04 yz cam? and the wr exhaust cam is just a detuned version of the yz for more control in the woods? sounds good, thanx

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On the question of the WR vs. YZ within '04 model year, I suggest you do a search to see what comes up. In the 250F, the cam itself is the same, and you can actually change the timing of one or the other to make a WR more like a YZ, but in the 450s, I'm not sure.

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dont waste your time chasing yamahas cam. Buy a hotcams cam. It will deliver more power without question. then when you are satisfied that hotcams rocks buy an intake cam too.

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Probably better off buying the set to begin with; they would compliment themselves.

Hey, 'Rider, where've you been? I thought you got lost in the upgrade. :cry:

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dont waste your time chasing yamahas cam. Buy a hotcams cam. It will deliver more power without question. then when you are satisfied that hotcams rocks buy an intake cam too.

exactly. :cry:

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thanx for the reply, using both hotcams will i have increased bottom as compared to the stock wr or will it just move the power curve up the rpm scale?

:cry:

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I never did get around to installing them. But it gives more mid and top end. But you still maintain your bottem if not get a lil more.

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