Hardware: 2001 650R partially uncorked. Havn't done insulator or air filter yet. Install: Just installed the Hotcams Stage 2 with DynoJet kit and FMF Power bomb header and PowerCore4 pipe. Pipe and carb work was simple but the cam left a bit to the imagination. Really crappy directions for the DIY'er... really crappy. Not even vague, didnt even mention the word XR or 650 other than the paper that identified the cam. Anyhow, I left the spring and plunger in as it never mentioned taking it out and it seemed secure. I ended up seperating the OEM cam thinking that some of the parts needed to be installed on the new Hotcams.... not the case as there are no dowel pins on the Hot Cam. So I put it back together. Test Ride: The bike goes like a mofo! Was hard starting but once it was warm I ripped on it down the street. Exhaust sounds tight and punchy...no more popping. The bike reved alot quicker and pulled hard in all gears. Wheelies alot easier. Exactly what daddy needed! FULL test ride tomorrow. Thanks to all the cats that have posted so much usefull info, it helps get the job done faster and I can do more work myself and spend the dou$h on parts instead of shop labor. Cheers.