Patent ID: 7867048

Claim:
An outboard motor comprising: a cowling; an engine body having a plurality of cylinders aligned vertically in the cowling; a discharge section disposed below the cowling and arranged to discharge burned gas generated in the plurality of cylinders; an exhaust passage arranged to guide burned gas from the plurality of cylinders to the discharge section; and a catalyst arranged to purify the burned gas in the exhaust passage; wherein the exhaust passage includes: a plurality of first passages connected to the plurality of cylinders and joined at a flow-joining portion located below a topmost of the plurality of cylinders; a second passage connected to the flow-joining portion and extending above the flow-joining portion; and a third passage arranged to pass above the topmost of the plurality of cylinders from an upper end of the second passage and is connected to the discharge section; wherein the catalyst is located in the second passage; the second passage includes a first straight passage extending vertically on a side of the plurality of cylinders, and the catalyst is located in the first straight passage; the third passage includes a second straight passage located on an opposite side of the plurality of cylinders from the first straight passage, and a connection passage arranged above the topmost cylinder and to connect the second passage and the second straight passage; and the plurality of cylinders and the second straight passage are disposed in a common cylinder block.