| 摘要 |
PROBLEM TO BE SOLVED: To provide a breather for recirculating blow-by gas with a reduced number of parts. SOLUTION: A carburetor 27 is attached to a cylinder head 18 through an insulator 28. The carburetor 27 generates air-fuel mixture of fresh air and fuel, and the mixture is supplied to an intake port of an engine, and outside air cleaned by the air cleaner 29 is supplied to the carburetor 27. The blow-by gas blows from a gap between a piston 14 and a cylinder bore into a crank chamber 30 in descending the piston, and reaches a valve chamber 22 through a chain chamber 13a. And then, the blow-by gas is returned to a clean side from a passage 31 formed to the cylinder head 18 though an insulator passage 32 formed to the insulator 28, a carburetor passage 33 formed to the carburetor 27, and a cleaner passage 34 formed to the air cleaner 29, so that the blow-by gas is recirculated in an intake system. COPYRIGHT: (C)2005,JPO&NCIPI
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