Hi guys, I am in the market for a second hand YZ450F/CRF450/RMZ450/KX450F from about 2007-2008. I know buying a used 4 stroke motocrosser can be risky business, as they are quite expensive to repair and high maintenance machines. Unfortunately I just cannot afford a brand new one, my budget is $5000 (AUD). I know a little bit about bikes, but in no way am I a bike mechanic. I used to have a CR250 about 5 years ago, so it has been a while since I've actually owned a bike. I've done alot of research on the internet and put together a list of things I should inspect/look out for when purchasing a 2nd hand 4 stroke motocrosser. In this list I've also listed how to inspect the item and some questions I plan to ask each seller. The list is located here: http://postimage.org/image/lxmh2qhw/ I think this is a good starting point in finding a good second hand bike. Can anyone suggest anything else I should be inspecting when looking at the bike? Any feedback would be much appreciated!