| 摘要 |
Provided is an air-cooled engine unit capable of suppressing the degradation of a catalyst, even when the catalyst is arranged near an engine body. This air-cooled engine unit (11) has a compression ratio of 10 or higher, and comprises a catalyst (53) that is arranged in an exhaust gas passage section (51) and arranged near a combustion chamber. The path length of the exhaust gas passage section (51) from an exhaust gas port to the catalyst (53) is shorter than the path length of the exhaust gas passage section (51) from the catalyst (53) to an atmospheric release opening (64a). |
