Small-sized boat

A personal watercraft comprising:

• a hull;
• an engine compartment defined by the hull;
• a single seat for straddling by one or more passengers disposed along a central axis of the hull directly above the engine compartment;
• a jet pump for producing forward thrust by expelling water from a stern of the watercraft to propel the watercraft in a forward direction;
• and an engine disposed in the engine compartment for driving the jet pump, the engine comprising a multicylinder engine having a crankshaft extending along a line passing through the bow and 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 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 and a fuel supplying pipe disposed below the carburetors in parallel with the crankshaft axis.