1. Is there a way to to know what aftermarket parts will transfer from the 2006 250f to a 2009 450f? I know how to use the parts finder and Micro-fiche, but I'm interested in the add ons. Examples are JD Jet Kit, chain guide, hand guards, new brake line, sprockets, skid plate, Scott's stablizer, etc. A lot of the parts are similiar between YZs so I'm hoping for a lot of fits. 2. I've been reading the forum and thanks to the search, I already have a good idea of 450f tweaks I need. I'll start with the cheap tubes, then the crappy stock silencer, then the rear shock, then the chain slider mod. Any objections? I made the jump from my 250f to a 450f this week. With the 2010s on their way and the dealers "no deals other than MSRP plus the additional 'normal' fees," I went with a new 2009 from out of state. I race desert in Nevada which includes some single track, some washes, some fire roads, some tight stuff, some hills, and some wide open fields. Thanks in advance.