Ok, here's the scoop on YZ450 cam profiles. ALL '03-'09 YZ450's have the SAME lift and duration (as far as I can tell with a degree wheel
and dial indicator) and appear to be a symmetric profile.
I checked the lift, duration, lobe center, and decomp pin stats for the following cams;
5TA-00 intake ('03-'05 YZ and WR)
5TA-10 intake ('06 YZ/WR, '06-'09 YFZ)
2S2-00 intake and exhaust ('08-'09 YZ)
5TJ-10 exhaust ('03-'05 WR)
5TG-00 exhaust ('04-'05 YFZ)
4023-1IN Hot Cams
402-1E Hot Cams
I will be checking a set of '07 YZ cams, GYT cams, and a set of '07 WR cams in the near future.
All of the OEM
cams listed above had a lift of 8.61mm intake and 8.43mm exhaust and all had a duration of 244 degrees intake/exhaust @.050" lift. The only difference that I found was with the 'lobe centerline'.
The '06 YZ cams had an LCA of 106.5 degrees intake and 104 degrees exhaust (for a lobe seperation angle of 105.25 degrees)
The '08-'09 YZ cams had an LCA of 102.5 degrees intake and 99.5 degrees exhaust (for a lobe seperation angle of 101 degrees)
The '03-'05 YZ intake had an LCA of 109 degrees.
The WR and YFZ exhaust had an LCA of 126.5 and 127.5 degres, respectively and an LSA of 117.75 and 118.25 respectively.
For a good explanation of what these numbers mean, go to Web Camshafts site http://www.webcamshafts.com/
and click on the menu in the left side titled "Degreeing in Your Cam".
Edited by 2grimjim, January 20, 2012 - 05:39 PM.