I love the 1st gen R's I have many, some stock some not at all. The 85 round slide carb is a nice carb to use, pretty cheap to get and use. if you get a carb that does not fit you just need to use a reed spacer so the bowl clears the cases. Remember 82 swing arms are a one year only deal. If your top end is good and you just want it better, clean up the ports a little and bring your head in to have it trued up. This will only cost about$25 and will make you head gaskets last longer and bump your comp up a little.