The RD350 is a two-stroke motorcycle produced by Yamaha from 1973 to 1975. It evolved directly from the piston port

(pre-reed valve intake tract), front drum-braked, five-speed Yamaha 350 cc "R5".

The engine is an air-cooled, parallel twin, six-speed (in some markets, such as the UK, the first model was sold in five-speed form), reed valve-equipped intake tract two-stroke engine. The bike is usually referred to as a sport bike.

All models were equipped with "Autolube" automatic oil injection, relieving the user from the need to mix gasoline and two-stroke oil.

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