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g-powerr

'03 YZ250F cams in a '00 WR400

7 posts in this topic

I know that my question might be for the WR section but I'm sure I have a better chance for a good answer here so:

Will both intake and exhaust cams from a '03 YZ250F fit in my '00 WR400? I can get both cams for less than $100 so I think it will be a good deal. Also will I gain some more power with these cams, besides the auto decompression?

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No, the 250F cams won't fit at all.

The YZ450 cams won't fit as a pair, because you won't be able to time them. Read:

http://www.thumpertalk.com/forum/showthread.php?p=8907584#post8907584

Refer to the DCM cam thread, link to instructions for details.

Using the '03 exhaust cam provides a nice little boost in power, but the aftermarket stage one cams are easier to install.

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Thank you kindly sir!

It's really hard to get HotCams or any aftermarket cams here, almost nobody ships to Eastern Europe...wish I was born in the USA.

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Then what you want is a cam from an '03-'05 YZ450. An '06 will also work, but you'll loose a bit of low end (not much)

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Using the '03 exhaust cam provides a nice little boost in power, but the aftermarket stage one cams are easier to install.

grayracer513, please help me figure out what combination to use.

I have a '03 yz450f exhaust cam, and a hotcams stage 1 exhaust cam

What would you recommend for best performance in my case (yz426):

a. 03 exhaust cam + stock intake

b. hotcams stage 1 exhaust + stock intake

c. hotcams stage 1 both exhaust and intake (will need to buy the hotcams intake)

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There isn't really that much difference between the three. If I had the parts you have, I'd probably lean toward :thumbsup: just for the simplicity, assuming the Hot Cams exhaust is an auto decomp cam made for a 426.

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There isn't really that much difference between the three. If I had the parts you have, I'd probably lean toward :thumbsup: just for the simplicity, assuming the Hot Cams exhaust is an auto decomp cam made for a 426.

Thank you!

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