Yes the RH (no need to call it a 250) had a great motor.  I traded mine in on a RM 250 A in 1976.  Anyway I did the gearbox on it at a meeting early in 1976.  The guy who had the RH let me ride it at the meeting.  The motor was a lot better than to RM.  Anyway after that Mayfairs the Qld Suzuki importer, who I was working for, swapped the RM 250 for a RM 370.  That was a great bike.