US Patent 7632162 Personal watercraft with engine having exhaust collecting system

In a personal watercraft equipped with a multi-cylinder engine including an exhaust collecting system configured to discharge an exhaust gas from the engine, the exhaust collecting system comprising a plurality of exhaust passages respectively corresponding to a plurality of cylinders provided in the multi-cylinder engine, an exhaust collecting passage which is located downstream of the plurality of exhaust passages in a flow direction of the exhaust gas and is configured to collect the plurality of exhaust passages, a water jacket formed at an outer peripheral region of each of the plurality of exhaust passages, for cooling the exhaust gas flowing in the exhaust passages, and a connecting passage configured to connect at least two of the plurality of exhaust passages.