I just bought myself a new 2007 yz450f and was happy with it through the break in ride but am finding odd things that i would like to have clearified now that I am starting my adjustments and check ups. First of all, an oil change is a very straight forward prosess on most bike but the 07 yz450 was a lil different so I refered to the manual through all the steps. Warming the bike up for two minutes and draining the oil which was just full of crap. Is that to be expected during the first oil change on a new bike? Like I mean the filter was pretty well plugged solid. Anyway, I drained the oil and cleaned everything i could so it was spotless, reinstalled the drian plugs, and intalled a new oil filter. The manual calls for 1.0 liters of oil when the filter is changed and a total volume of 1.2L I assume the diffence is made up by the residue left in the case (0.2L)?? On the YZ450 there is an over flow plug as well as a dip stick. I left the overflow plug out as an indicator of the case being full as well as measuring the volume of oil i was adding. After adding only 0.7L it started to come out the overflow. I found this a lil strange since it wasn't showing at all on the dip stick. so I put the over flow plug in and continued adding checking the dip stick. I added 1.1L and desided to warm the bike up to check the oil. still nothing on the dipstick. I wanted to see how much it would take to show so I added more. I added 2 full liters and still nothing on the dipstick. So how come the overflow indicates full with so little oil and the dipstick doesn't indicate anything. what am i doing wrong? (I drained it all again and just added the measured ammount trusting the manual.) Also this is my first 4-stroke bike and I am noticing alot more noise in the top end. The valves I guess? How much noise is normal? It starts on the first kick every time, hot or cold. I read only to worry about valve problems when the bike is hard to start. Any advince would be great.