?'s About YZ Cam in an '05
Posted April 04, 2005 - 07:17 PM
I did have a couple of questions, if I go ahead with the mod...When installing the YZ cam, do I install it they same way as the WR cam with regard to the punch marks lining up at TDC as shown in the manual? If that's all there is to it, other than re-checking my valve clearances once it's installed, then it's a breeze. Now will the YZ cam tend to create tighter or looser valve clearances? Thanks to all you speed gurus out there for your wisdom ...SC
Posted April 04, 2005 - 09:52 PM
It won't be "scary fast" compared to stock, but it will provide a noticeable improvement.
Couple it with a YZ pipe, open the airbox, and add a JD jet kit and you're good to go.
Posted April 05, 2005 - 05:32 AM
Posted April 05, 2005 - 07:02 AM
With the longer pin, it holds the valve open too long and doesn't allow enough compression to build for starting.
The only difference between the YZ and WR cam is the timing marks are rotated by one tooth and the pin is shorter. You CAN grind the pin down and rotate the cam as you would an '02, but for the $150, I'd just buy a new cam.
Posted April 05, 2005 - 03:45 PM
Posted April 05, 2005 - 04:34 PM
Posted April 05, 2005 - 05:08 PM
At first he thought we had screwed something up because he felt like he was hitting the rev limiter too quickly. A quick check pinned in 5th at 81mph proved that the limiter was in fact NOT cutting in at 7k as we suspected... the bike is just THAT FAST getting through 1st through 3rd, and pulls hard in 4th.
Compared to my WR (still timed WR), the bikes are pretty much even into 3rd. Top end of 3rd the YZ-timed WR will pull away slightly, and by the middle of 4th it's all over for the stock WR.
There is NO loss of bottom end.