SUZUKIDR 500 S 1981 - 1982

　　For 1981 there was an entirely new engine, the single remnant of the old being the bore staying at 88 mm, with the stroke now growing to 82 mm for a grand total of 498 cc. A pair of counterbalancers was added to the crankshaft, one fore, one aft, as vibration did become an issue with the half-liter size. This air-cooled, wet-sump engine had a chain-driven single overhead camshaft, four valves and a compression ratio of 8.7 to 1.