Alright, since it appears that you are very knowledgeable on all subjects of the YZ450F, I've got a few questions that other folks may be able to learn from as well. 1st. I've just bought an 06' YZ450, It has 1.2 hours on it now that I have broken it in, I have done the first oil change, do I need to really replace the front fork oil like the manual suggests? 2nd. I'm 6'5" and about 230 lbs. what setups will need to get done very soon besides taller bars. Do I have to get stiffer springs? 2rd. All this business about the fuel screw, what do I really need to know and do about it. I'm a beginner rider in the northwest riding at anywhere from 500' to 5000' elevation. I would like to ride as much track as I can but am also riding some trails. Let me know however you can help. Thanks in advance for the help.