| 摘要 |
PURPOSE: To provide the frame structure of such a new motorcycle for which the capacity of its air intake system members is increased and also that of its fuel tank is increased by securing the size of a space surrounded by the vehicle frame in which the air intake system member is placed, an engine and the fuel tank larger than its conventional one, even for such a motorcycle whose strength can be sufficiently secured and having an intake air duct for introducing new air. CONSTITUTION: In a motorcycle 1 in which air intake system member 9, 11 are arranged in a space part 8 partitioned by an engine 3, a fuel tank 5, and a vehicle frame 7, and fresh air is supplied thereto via an intake air duct 15, one side 71 of the frame serving as main one out of vehicle frames 7 is formed in such a shape as to be cut in pieces on the way and the fresh air exhaust port 15a of an air intake duct 15 is arranged thereto. |
