The interim SS12 was replaced by the "full scale" 550 cc SS20 version presented on 27 October 1977, with a slight facelift consisting of a new grille, redesigned cladding around the C-pillars, and a new dashboard. The SS20 is equipped with the T5A engine (first seen in the Jimny), with 539 cc it offered at 5000 rpm and 5.3 kgm at 3000 rpm, which helped bring top speed up from 105 to 110 km/h (65 to 68 mph). To use up leftover four-stroke engines, the SS11 received the same facelift, becoming the SS11-2. The SS11-2 was fairly short-lived, though, as the T5A engine met emissions regulations on its own and Suzuki was now able to terminate their contract with Toyota. The torque gap between the four- and the two-stroke models was widened further: while the SS11 could climb a slope of 0.34 tanα (18.8˚) the SS20 could manage 0.52 tanα (27.5˚). The production run of the SS20 was not very long either, coming to an end after just over a year and a half.