Tired of salivating over these new 2010 450's. Been riding my heavily modified 2005 yz 250 2t for several years now and am ready to move up. I have only ever ridden two strokes so looking forward to this new bike. I do have a few questions about maintenence differences in the two m,achines. I am not asking about any thing other than motor stuff such as oil change intervals, gas, valves, and all that good stuf. I currently change my oil every two rides and use straight 100ll av gas that is very easy for me to get. How do you guys keep your pump gas good for a week or two? What kind of oil and how often? Valves on these new machines? Talk to me! Thanks for any replies and look forward to contributing to this new dark side of things! And BTW I am keeping my 2t just in case! Thanks.