Patent ID: 8231419

Claim:
A water jet propulsion watercraft comprising: a main engine body; a rotor chamber disposed at a rear portion of the main engine body; a crankshaft disposed so as to extend penetratingly through the rotor chamber such that a rear end portion of the crankshaft protrudes to an outer side of the rotor chamber, the crankshaft having a flange portion that is integral with the crankshaft inside the rotor chamber; a rotor unit housed in the rotor chamber and fixed to the flange portion; a stator unit combined with the rotor unit to make up a power generator; a drive shaft connected to the rear end portion of the crankshaft and arranged to be rotated together with the crankshaft; and a jet propulsion unit arranged to suck in and jet out water and including an impeller that is coupled to the drive shaft.