| 摘要 |
PURPOSE:To improve starting property at low temperature to stabilize combustion at starting by providing a check valve communication to the atmospheric side at a predetermined negative pressure in a fuel path provided between a port opened downstream of a chode valve and a float chamber. CONSTITUTION:A check valve 38 attached to a position near and downstream of a choke valve 14 arranged in an intake path 12 of a carbureter body 10 is constituted from large and small diameter portions 41,42 to communicate to a float chamber 36 through a hose 40. Also, to a path 62 in the small diameter portion 42 opened to the path 12 is fixed a nozzle 60 mounting the hose 40, and a ball 54 is disposed in a hole 52 arranging the lower space 50 of the large diameter portion 41 in communication with the atmosphere to be urged by a spring 58. Since negative pressure in the space 50 is low in starting, the hole 52 is closed by the ball 54 to provided rich mixture. As intake negative pressure is raised after starting, the ball 54 is moved and thereby the hole 52 communicates to the atmosphere so that the mixture is prevented from being too rich. |
