1956 Ariel HS 500. 500c OHVA beautiful and rare Ariel HS, the competition version of the Red Hunter, produced between 1954 1958 only (HS stood for Hunter Scrambler). They were intended to compete against BSA Gold Stars on the track, and were indeed powerful, purpose built bikes in their day. The HS had sportier cams, stronger valve springs, higher compression and other trick features giving approximately 34HP at 6,000RPM Advertised in period as proven in competitionsuper tuned