Patent ID: 6205987
Filing Date: 2001-03-27
Classification: F02M

Abstract:
A small-sized boat thrust by a jet pump and having a hull for containing an engine for driving the jet pump, the engine comprising: a multicylinder four-stroke engine disposed in an engine compartment of the hull for driving the jet pump, the multicylinder engine having a crankshaft extending along a line passing through a bow and a stern of the hull; a plurality of diaphragm carburetors each without a float and each including a shaft for a throttle valve provided vertically with respect to the crankshaft of the engine, the number of diaphragm carburetors corresponding to the number of respective cylinders of the engine, one throttle link connected to upper parts of each of the shafts for the throttle valves, and each carburetor having a diaphragm mechanism having an operating surface disposed perpendicular to the crankshaft axis; an air pump connected to an input of each of the diaphragm carburetors and to the throttle link for regulating an air supply to the carburetors; and a fuel supplying pipe disposed below the carburetors in parallel with the crankshaft axis.