| 摘要 |
PURPOSE:To extend the degree of freedom from the forming standpoint of a connecting duct by setting up a fuel supply system so as to have height of the venturi passage situated in and around the bottom of a crankcase and to cause an inlet port to be directed to the front of a vehicle, then connecting a discharge port to an intake opening formed in the bottom of the crankcase. CONSTITUTION:Air inhaled in an air cleaner 21 from a fresh-air intake pipe 21b is inhaled in a carburetor 20 (fuel system) by way of symmetrical branch ducts 22b and a surge tank 25 after being filtered by an element, hereat it comes a mixture with gasoline and is fed to the inside of a crankcase 11a by suction. An intake opening 11b at the side of an engine is formed in and around the bottom of the crankcase 11a, and since the carburetor 20 is set up in a deeper spot than the bottom of a crankcase 11 and connected to the intake opening 11b on the bottom, an interval between the carburetor 20 and a front-wheel rear edge becomes widened, so that thickness in the longitudinal direction of a part of the surge tank 25 of a connecting duct 22 is sufficiently securable, thus a problem of restriction from the forming standpoint of this connecting duct 22 is no longer caused there. |
