Alright, did the 2 stroke 05 YZ 250 thing for a year...coming from a Raptor, I adapted..but I just still like fourstrokes more. Anyway, here is what my plan is, but I got a couple questions. 1.)I have Sidewinder chain and sprockets on my YZ 250, I want to keep them. Are YZ 250 and YZ 450 sprockets the same? Also, is the gearing the same? 2.) I have a SDG Tall seat for my YZ 250...once again, planning to keep it. Will a YZ 250 seat fit a YZ 450? 3.) I lowered my stock footpegs on my YZ 250(I learned that off of here by the way, thanks whoever it was that made the guide), will they fit on a YZ 450? 4.)I heard that buying a Twin Air filter with the backfire flame resistant stuff, and then getting a YZ 250 air filter cage is a good setup. Is the way I want to go ? Any other good setups? 5.) Last one, I swear. Ok, so I wiegh 230 and my stock YZ 250 was deffantly not springed/valved for me. I could tell on the track that I needed suspension work. What suspension company do you recomend for the YZ 450? (I would like for it to be afordable, but yet good) Well if some of you guys can answer my questions, that would be AWESOME. Even if you can only answer like one thats fine, just post it and let me know. Thanks so much TT'ers.