I have ridden bikes for almost 40 years and am thinking about getting a 4 stroker. I have had very good luck with my Yamaha stuff and am looking at getting a yz450f. What years and areas should I look for? I know about looking for wear patterns, head bolts that have been removed indicating removal. I need to know the nature of the beast and what perks go with what years? Not really sold on injection yet. Old school carb guy. I welcome all input. This is just to putz around on the farm, check fences and maybe occasionally jump the terraces or pond banks.