The LJ10 had a 359-cc, air-cooled, two-stroke, in-line two-cylinder engine. The liquid-cooled LJ20 was introduced in 1972 with the cooling changed due to newly enacted emission regulations, and it gained 3 hp. In 1975, Suzuki complemented the LJ20 with the LJ50, which had a larger 539-cc, two-stroke, in-line three-cylinder engine and bigger differentials.