I'm thinking about an 2009 kx450f ( around 1400$ ) and wanna to look at it this weekend. This monster has been USED LOTS and comes in unknown hrs. according to owner it need gasket replacement . it have rekluse clutch and bunch of air filter plastic and etc . are kx450f as reliable as yz450f !? are these bike easy to change gasket and other maintenance !? is it worth putting money and time on a kawasaki with this year model !?