Those Yamaha RD-350's and 400's were great bikes, my brother had at least 3 or 4 of them in the late 70's, 1st the 350's, then the 400. Never had an RD-500 though. That was back in 1978 to like 1981, then he bought a brand new 1983 Honda CB750SS (Super Sport) in Silver and Blue, that thing was a rocket ship for it's day and he weighed all of 125 lbs back then. He drove it year round. He was in the Airforce stationed in Plattsburgh, NY near the Canadian border. He would drive it in the dead of winter back and forth to Peekskill, NY. He was a nut on that thing going down the NYS Thruway (87) at 5 degrees, the State Troopers caught up with him once, but let him go because he was in the Air Force. They never bothered him again. Back then, you could get away with stuff. They just told him keep it under 90 and we won't pull you over. It helped that my Uncle was a 1st Sergeant with Troopers, lol. Then years later in the 90's he bought a 2nd hand CB1100F, he still has it.