On what make of motorcycle did Carlos Lavado win the 250 cc Motorcycling World Title in 1983 and 1986?

Yamaha Motor Company Limited (ヤマハ発動機株式会社 Yamaha Hatsudōki Kabushiki-gaisha) is a Japanese manufacturer of motorcycles and other motorized products. The company was established in 1955 upon separation from Yamaha Corporation and is headquartered in Iwata, Shizuoka, Japan. The company conducts development, production and marketing operations through 109 consolidated subsidiaries as of 2012.

Carlos Alberto Lavado Jones, was born in Caracas, Venezuela. Lavado made his international racing debut in the 1978 Venezuelan Grand Prix, finishing second in the 250cc class.The following season, he won the 350cc class at the 1979 Venezuelan Grand Prix.

In 1980, he began competing full-time on the Grand Prix circuit. He went on to win the 250cc World Championship in 1983 and repeated the feat in 1986, both times on Yamaha TZ250s. In fifteen seasons of Grand Prix competition (1978–1992), he participated in 137 races, 125 of them in the 250cc division. He had 36 podium finishes and 17 victories in the 250cc class and 6 podium finishes with 2 victories in the 350cc division.

In motorcycle racing Yamaha has won 39 world championships, including 6 in MotoGP and 9 in the preceding 500 cc two-stroke class, and 1 in World Superbike.