In an internal combustion engine (E) for a saddle riding vehicle, in which a gear transmission (28) and a shift drum (48) of a shift change device (47) ...
PROBLEM TO BE SOLVED: To provide a DOHC type internal combustion engine which has a pair of intake valves and a pair of exhaust valves arranged at a periphery of a plug hole and also has two pairs of locker arms interposed between an ...