This Yamaha nameplate was introduced for the 1990 model year as a small-displacement off-road play bike aimed at entry-level trail riding and recreational use. Yamaha’s own historical material places it in the company’s 1990 model lineup, and later factory technical literature describes it as one of Yamaha’s two-stroke playbikes for North American and Pacific markets. It occupied the lightweight end of Yamaha’s off-road range, sized for new riders and younger enthusiasts who wanted a simple, approachable trail machine rather than a competition motocrosser.
The model belonged to Yamaha’s broader family of small off-road machines that also included the longer-running junior and playbike lines. In Yamaha’s internal product review from 2000, the RT100 is shown as part of the company’s earlier two-stroke playbike era, alongside the RT180, and it is paired with the later TT-R family as Yamaha moved toward four-stroke replacements in this category. That transition helps mark the RT100 as a late-1990s Yamaha trail model that bridged the gap between the company’s traditional air-cooled two-stroke playbikes and the newer emissions-era four-stroke minis.
Available factory-era references indicate the RT100 remained in production through the 2000 model year. There is no evidence of a later revival under the same nameplate, so it is best understood as a single continuous production run from 1990 through 2000. The model is remembered as a straightforward, durable little dirt bike that helped introduce many riders to off-road motorcycling.