Motorcycles are an integral part of the family vehicle system. The transition to 3-wheelers began in about 1994 with the introduction of the R125. That motorcycle, in turn, led to the R125Z, produced from 1994 until 1996. The R125Z was part of a successful program that included the original R125, the R1R, and the R1RZ. The three-wheeler program was discontinued in 1998. YAMAHA 125z part catalog 2004.pdf
Motorcycle models introduced to the lineup for 1998 were called the R6S and R7S (with the former being the 125cc Sport, R and S being an “R” or “S” depending on which model year they were introduced). The R7S has a production run of five years. The Single-cylinder units have a round-tube frame for the purpose of weight reduction and a sprocket mounted in the center of the cylinder in order to achieve higher engine speeds.[1] The R7S was a major redesign over the R1Z (named such because it was the second evolution of the R1Z). YAMAHA 125z part catalog 2004.pdf
Initial sales of the R7S in the United States in 1998 were impressive: more than 72,100 units in 1998, with about 63,000 sold by the end of the first model year. The speedometer/tachometer unit on the R7S is not yet a digital unit, but an analog unit backed by a transistorized speedometer. The R6S was introduced as a two-cylinder model for the Japanese market in mid-1998. The R8S (c.f. R8Z) was a three-cylinder model and a development of the R7S. It used counter camshafts in lieu of a supercharger. About 83,500 of the R6S and R7S models were produced.
