I have a 01 YZ426 and have had a 03 450 cam along with a timing chain sitting in my parts bin for a few months now. It's finally time to install them. I have the service manual, but I'm wondering if the manual I have is correct. I recall hearing something about a different flywheel/rotor/stator design on the 2001 model. Do I need the special holding tool to remove the rotor, or is there an easy workaround? I'm not trying to cut any corners, but I'm just wondering if this tool is essential or if there's an easy do-it-yourself method. (I do have a flywheel puller) When removing the flywheel and replacing the timing chain, do I just make sure I don't rotate the engine or the cams? I recall reading something about making sure the flywheel is installed so the timing marks align properly. Is it best to do the chain first and then the cam swap, or is the order unimportant? Since I'm doing this work, how much extra work would it be to remove the cylinder and replace the rings? My bike is in excellent condition and has been well maintained throughout it's life, however I don't know exactly how many hours are on it. Rings aren't very expensive. On the other hand it runs great, with plenty of power and no smoke, so I'm not sure it's necessary. I'm sure I would answer these questions once I get in there, however I'd like to utilize all the knowledge and past experience here and know any issues ahead of time so I'm prepared.