| 摘要 |
PURPOSE:To reduce the intake resistance by securing the sufficient sectional surface of an intake passage by utilizing the inner space of the right and left main frames having a broad box-shaped section, at least as a part of an intake passage leading from an air cleaner to a fuel feeding device. CONSTITUTION:As for the car body frame 2 of a motorcycle 1, the right and left main frames 4 and 4 in pairs each of which has a wide box-shaped section and extends in nearly straight line form are extended rearward and downward from a head pipe 3, and a rear arm bracket 6 extending downward is installed at the rear edge. An engine 22 is installed under the main frame 4, and a carburetor 33 as a fuel feeding device for the engine 22 is arranged between the rear parts of the right and left main frames 4 and 4. In such a motorcycle, the inner space of the main frame 4 is utilized as at least a part of an intake passage 64 leading to the carburetor 33 from an air cleaner 35 arranged between the right and let main frames 4 and 4 in pairs on the upper side of the carburetor 33. |
