The 4 stroke "Enduro" Hondas seemed to be the most popular with the DT Yamaha line in second place. At least in the early mid 1970s. The RD350 was just right. Its power did not overpower its chassis like the big 500 and 750 ring dinger Kawasakis. Suzuki had a powerful 2 stroke street bike in the late 60s in the Titan- but they went to their GT line later and while attractive- didn't come close to touching the other Japanese ring dingers in acceleration. A Yamaha RD 500 would have been interesting.