In 1978, BMW presented the BMW R 65 alongside the BMW R 45 as a small entry-level model. The only technical difference was the bigger displacement at 650 cc, which assisted the R 65 in generating an engine output of 45 hp at an engine speed of 7,250 rpm. This did not take full advantage of the new 50 hp insurance class that had been introduced in Germany a short time previously. When the motorcycle was revised in the model year 1981, the power output was raised to 50 hp. The lower weight and the stable chassis streamlined for agility and good handling made a substantial contribution to the popularity of the R 65 in Germany and abroad.