Yamaha continued on with each the two-stroke line and 4-stroke twins at a time that other Japanese companies were being significantly relocating to four cylinder 4-stroke machines, a trend led by Honda in 1969 with the famous CB-750 4-stroke 4-cylinder cycle. By 1980 the blend of buyer desire and environmental regulation manufactured four strokes ever more well-known. In September 2021, she donated $3,000...