Abstract: A motorcycle provided with a central trunk and left and right trunks at the rear portion of the vehicle body. The vehicle body frame of this motorcycle is composed of a main vehicle body frame at the front and a rear vehicle body frame that can be detachably mounted to this main vehicle body frame. The rear vehicle body frame constitutes a trunk assembly jointly with a central trunk, a left trunk, a right trunk and other equipments such as lamps, and after the above-mentioned trunk assembly has been formed preliminarily as one unit outside of a main assembly line, it is detachably mounted to the main vehicle body frame on the main assembly line. Accordingly, the work on the main assembly line becomes little and simple, and a productivity is improved. Upon replacement of a rear wheel tire, it is only necessary to dismount the entire trunk assembly together with the rear vehicle body frame without individually dismounting a large number of equipments.

Abstract: A seat adjusting apparatus for a saddle-type vehicle having a seat provided with a backrest is disclosed. It is provided with an adjusting mechanism for adjusting the state of the backrest, such as the longitudinal position or the tilting angle of the backrest with respect to the seat. A manual operating apparatus connected to this adjusting mechanism and adapted to drive the adjusting mechanism is disposed on the side of the seat below the backrest. The rider can freely adjust the position, angle, etc. of the backrest by operating the manual operating apparatus while maintaining his attitude astride the seat. The backrest may be provided on both sides with waist holding members which are opened and shut sidewards by operating the manual operating apparatus.

Abstract: A heated air ducting structure (20; 200; 300; 360; 400) for motor cycles (50; 350; 450) including an engine (2; 302) mounted at a lower position in the front part of a vehicle body frame (1) and a a rider's seat (4; 401) installed on the vehicle body frame behind the engine. The ducting structure comprises a duct (20a; 208, 208r, 205a, 205c; 321, 314; 361, 365; 404, 405, 409) having a heated air entry (20b; 208c; 322; 362; 407) which, facing a rear portion (2b; 302g) of the engine, takes in heated air that has cooled the engine, and a heated air exit (20c; 205f; 328; 365b; 409b) which opens in the rearward direction of the vehicle.

Abstract: In a saddle type vehicle wherein a front portion of a saddle type seat covers a rearward portion of a fuel tank placed above the engine on a small vehicle frame, both side portions of the forward portion of the saddle type seat are engaged to attachment members located on the rear portion of the fuel tank. Rubber grommets may be employed between the saddle type seat and the fuel tank for reducing vibration. Plugs extending outwardly from the attachment members on the fuel tank could be employed to engage blind holes in vibration isolating members held within projections of the seat frame structure to retain the forward portions of the saddle type seat flush with the fuel tank.

Abstract: An upholstery material for use on a seat, includes an intermediate resilient member composed of a plurality of sheet-like or block-shaped resilient bodies having different thicknesses and arranged in order of thickness, a face sheet covering one surface of the intermediate resilient member, and a back surface covering the opposite surface of the intermediate resilient member, the face and back sheets being joined to each other through gaps between the resilient bodies. A method of making such an upholstery material is also disclosed.