| 摘要 |
PROBLEM TO BE SOLVED: To provide a secondary air feeding device for a forced-air-cooled engine to smoothly and efficiently feed secondary air to an exhaust port without a hitch and effectively and efficiently purify exhaust gas. SOLUTION: This secondary air feeding device for a forced-air-cooled engine is applicable for a forced-air-cooled engine 1 for a bicycle. This forced-air-cooled engine 1 has a cylinder 2 covered by a cylinder cowl 4. Cooling is executed by blowing cooling air against the cylinder 2 from a forced-air cooling fan 6 situated on one side of the cylinder 2 and discharged through an exhaust opening 8 on the other side of the cylinder 2. A lead valve device 15 for feeding secondary air is removably fixed at the cylinder cowl 4 and a lead valve 22 in the lead valve device 15 is disposed such that its bending operation direction is a direction extending orthogonally to a cylinder cowl wall surface. A union 24 for output of the lead valve device 15 is opened to approximately the extension line side of the free end of the lead valve 22, and secondary air guided by the lead valve device 15 is smoothly guided by the union 24 for output.
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