My favorite bike ever was a little ported/piped 79 Yamaha Rd400F Daytona special. 2 stroke street bike from hell. I think Satan personally authorized it ;) Could run with 650s of the day all day long and a dream in the corners.
PEAKY as hell powerband with the mods. But oh so FUN! ;)
I would have loved to get my hands on an white RD350LC when I was in high school. I can’t recall if the “Elsie” had a power valve or not, which broadened the powerbands on those bikes quite a bit.