Internal combustion engine and straddled vehicle

Abstract

There is disclosed an internal combustion engine (1) including a cylinder body (3); a cylinder head (4) connected with the cylinder body; a cylinder head cover (5) connected with the cylinder head; and a valvetrain provided in the cylinder head and the cylinder head cover; the internal combustion engine further including a nozzle (10) provided in the cylinder head cover and located so as to allow oil to be supplied to the valvetrain; the nozzle including a first nozzle portion (11) extending from a base end (10be) of the nozzle toward a tip end (10te) of the nozzle (10), and a second nozzle portion (12) extending from a tip end of the first nozzle portion (11) to the tip end of the nozzle (10) and having a cutout portion (12c), facing the valvetrain, formed as a result of the second nozzle portion (12) being partially cut out in the circumferential direction. (FIG. 12)