HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
bfg50

YZ cam upgrade.

10 posts in this topic

I am wondering why my WR450 is hard to start after I put the YZ cam in it. Could it be the jetting? Or could it be related to the woodruff key problem, is it possible that it is bent just enough to throw off the timing?

Share this post


Link to post
Share on other sites

I did mine when the engine was still hot and it started up right away. I also rode a few hundred miles on it before going back to WR cam. I did notice that it was a little easier to start with the YZ cam. I would check that you have the cam in the right position. Take the cover off and check everything again. :)

Share this post


Link to post
Share on other sites

I appreciate the feed back. I carefully checked the cam before I put it all back together. I actually marked the timing chain (with a magic marker) exactly where the WR cam's markings were. When I put the YZ cam in I used the same spot for the one that lines up with the top of the head (the left hand side mark). The top mark on the cam did not go in the exact same spot. That mark is 1 tooth to the right (closer to the intale cam). Does that sound right to you?

Share this post


Link to post
Share on other sites

That sounds right as far as the mark on the cam needs to be at the top of the engine cylinder sleeve casting. I remember it looking ackward because the decompression linkage looked in a different position. I rechecked mine and counted 13 links between the marks on the 2 cam sprockets. As far as why I went back to WR cam timing. In tight woods and hill climbing the WR cam is superior for load end grunt. You lose bottom end to get the high reving mid and top ends of the YZ cam. I for one did not like the sacrifice. More power up top does not suit my terrain and since my style of riding is a lot of short shifting and lugging to control wheelspin (mud) the WR cam is better for me. If i were out west in the desert I would definitely go with the YZ cam it rips! :)

Share this post


Link to post
Share on other sites

I counted 13 pins too. Well I have the woodruff fix scheduled at the dealership. I will let you know if it is bent. :)

Share this post


Link to post
Share on other sites

Thats strange. When I put my 01 WR250F to yz spec, it gained low, mid, and top. Very noticable all around. I WAS going to do it to my 450. I don't think I'll mess with it now. Thanks alot :)

Share this post


Link to post
Share on other sites

Yeah but if you get a good pipe on the WR the bottom end will rule by an even larger margin! Thunderrrrrrrrrrrrrr Alleyyyyyyyyyy! :)

Share this post


Link to post
Share on other sites

Don't cheat yourself. The WR with a YZ cam has plenty of bottom end. If you need more just change your sprockets. The YZ cam gives you all that and CRAZY REVING 2-stroke like BLAST OFF ACCELERATION!!!!!!!!!!!!!!!!!!!! :)

Don't forget. The WR cam is designed to s l o w you down. :D

Share this post


Link to post
Share on other sites

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
Sign in to follow this  
Followers 0