wr426 cam timing

I am planning on a top end refresh on my 01 wr. I bought the bike used a few years back so I want the piece of mind knowing that things are fresh. The question is: can I, for sure, put in a OEM 03 yz450 cam(auto decompress purposes)? I also want the bike to have more snap like the yz's have. In past threads there has been discussion if it correct to set 13 or 14 links between cam gears. Should I first clock the wr cam to yz spec, note the lobe position of the cam, and then install the new yz cam with the lobe in the same position regardless of the marks on the cam gear? Is the cam profile close enough between the two to do that or would I line up the indexing marks on the gear with the edge of the cylinder just like it was putting it in a yz 450? Thanks for any input

Hear ya go...SC

426AutoDecomp.jpg

Just count the "pins" between the dots like the pic misure clark posted (14) and you will be right on the money :thumbsup:

Thanks, I recall seeing this at some point. Has anyone out there done there cam upgrade according to this? If my valves are in spec to begin with do I automatically need to reshim with new cam in? What pros and coms did you experience? I just want to do it right the first time, is it better to just retime the stock cam???

You need to remeasure the clearance whenever you remove/replace a cam...SC

I read somewhere that the yz 450 cam gear has a different pitch and if installed there would be accelerated wear. Is the better choice the hot cams yz 426 cam w/ decompression and is it better to use their intake cam as well? Thanks for any info.

I read somewhere that the yz 450 cam gear has a different pitch and if installed there would be accelerated wear. Is the better choice the hot cams yz 426 cam w/ decompression and is it better to use their intake cam as well? Thanks for any info.

Go with the Hot Cams auto deco cam. It's worked great in my 01 WR 426 I have over 3000 miles on it and it works great. Yeah it may cost a few bucks more but it works. I kept the stock intake cam. No problems at all. No more starting ritual and no other problems when using it with a stock intake cam or cam chain. You don't need the intake cam unless your really looking for some HP or a different delivery curve. Hell a good running 426 is fast enough for me.

Thanks, I recall seeing this at some point. Has anyone out there done there cam upgrade according to this? If my valves are in spec to begin with do I automatically need to reshim with new cam in? What pros and coms did you experience? I just want to do it right the first time, is it better to just retime the stock cam???

Yes, those are the instructions I used when I did this mod.

sounds like some guys have had some issues w/ the hot cams, but it sounds like it's more with the e-start. How does the power delivery comparred to the stock cam set w/ yz time? I think that I'll probably go w/ both cams though. I mostly ride desert, but I do ride Kennedy Meadows area a few times a wear. I just want to feel more hit like my crf 450 has, but I want to keep the rideability w/ the heavier flywheel weight. Thanks for all the info

I am putting a Hotcam in my wr400 do I also have to retard the cam by one tooth from 90 degrees. Can anyone answer this?

Thanks

I put the cam in was easier then I thought, hardest part getting chain around cam while keeping engine at TDC. NO FN decompress lever I am so happy it starts like a normal bike now.

If those chains were a little longer..................................!!!!!!!!!!!!!!!!!!

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now