I just spent an hour and a half reading threads about cams and couldn't find the kind of thing I'm looking for, so I'm going to post a question. Sorry if this seems redundant. A couple months back, I picked up a 2000 yz426 that had dropped a valve and wrecked the top end. I've been slowly getting the parts I need to fix it and finally got the last bit a couple of days ago. Today, I went out to my shop to put the whole thing back together and make it run. Today was supposed to be the best day ever. Unfortunately, it didn't work out that way. To get to the point, I installed the cams according to the directions in the manual. Everything seemed to be going fine, until I noticed that the cam lobes were 90 degrees out of phase rather than the 180 that I think they should be. I double checked everything. The "I" mark on the rotor was lined up with the index mark on the case. Both cam sprockets had the "E" towards the exhaust side of the head and the "I" towards the intake side, and the punch marks were lined up with the top of the head. The exhaust cam is just a regular cam, not one with the auto decom on it. Is this normal? Did I read something wrong in the manual? Could one or the other be cams off a different bike, even though they fit? Is there a way to set the timing properly in this situation? I wish I had pics. I was just too frustrated by the end of the day to take any. All thoughts, ideas, or opinions are appreciated. Thanks!!