This lightweight cruiser emerged for the 2005 model year as the U.S.-market badge for Suzuki’s long-running 652cc single-cylinder cruiser lineage. It was positioned as an approachable entry in the boulevard-cruiser class, with a low seat, simple belt drive, and classic styling intended to echo older American-style singles rather than the larger V-twin cruisers that dominated the segment. The nameplate traces back to the earlier Savage/LS650 family, which had already established a reputation for being easy to ride and mechanically straightforward.
In Suzuki’s global motorcycle archive, the related Boulevard 400 appears in 2005, reflecting the introduction of the badge within the broader Boulevard family. In the U.S. parts catalog, however, the S40 shows a discontinuity in model-year fitment: Suzuki lists it for 2005-2009, then again for 2011-2019, indicating that it was absent for the 2010 model year before returning. That gap means the nameplate should not be treated as one uninterrupted run.
Through its life, the bike stayed close to its original formula. Rather than chasing frequent redesigns, it remained a simple, characterful middleweight cruiser with a torquey single-cylinder engine and a classic, minimalist silhouette. That consistency helped it appeal to riders who wanted cruiser styling without the weight, size, or complexity of bigger machines. The model remained in Suzuki’s U.S. parts and accessories ecosystem through 2019, after which it no longer appears as a current model-year offering.