Patent ID: 7246611

Claim:
A watercraft comprising a hull defining an engine compartment, a seat being positioned generally over at least a portion of said engine compartment, an internal combustion engine disposed in the engine compartment, a propulsion device driven by the engine, the engine having an engine body defining a crankcase and at least one combustion chamber therein, a lubrication system for supplying lubricant to at least the crankcase of the engine, an induction system configured to guide air along an induction airflow path to the combustion chamber for combustion therein, the induction system comprising at least one throttle body having a throttle valve and an inlet duct connected to the at least one throttle body, the throttle body and inlet duct at least partially defining an intake passage that opens within a plenum chamber, a blow-by gas ventilation system comprising a ventilation system inlet communicating with the crankcase, a ventilation system outlet opening directly into the induction inlet duct upstream of the throttle valve at a location inside of the plenum chamber and a ventilation passage connecting the ventilation system inlet and the ventilation system outlet, the ventilation system inlet being positioned lower than the ventilation system outlet.