| 摘要 |
PURPOSE:To release restriction on the fixing space thus to protect the functional parts by forming the lower space communicatable to the clean side at the bottom of case. CONSTITUTION:Lower space 8 is formed by a partition board 7 and the bottom board 1b of case 1. A lead-out port 20 for feeding secondary air of the exhaust gas purification system, an intake air temperature sensor 18 and a lead-out port 21 for returning the gas leaked through the crank case to a carburetor 10 are provided on the bottom board 1b. The cold or warm air led from a negative pressure intake air temperature regulator 17 will enter into the dusty side or an intermediate section space 9 then pass through a filtering element 4 from the underside and led through the clean side or the upper space 6 a communication port 13, a central tube 4b, the lower space 8 and a lead-out tube 11 to the carburetor 10.
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